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Quickstart: Use the Face service

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Important

If you are using Microsoft products or services to process Biometric Data, you are responsible for: (i) providing notice to data subjects, including with respect to retention periods and destruction; (ii) obtaining consent from data subjects; and (iii) deleting the Biometric Data, all as appropriate and required under applicable Data Protection Requirements. "Biometric Data" will have the meaning set forth in Article 4 of the GDPR and, if applicable, equivalent terms in other data protection requirements. For related information, see Data and Privacy for Face.

Caution

Face service access is limited based on eligibility and usage criteria in order to support our Responsible AI principles. Face service is only available to Microsoft managed customers and partners. Use the Face Recognition intake form to apply for access. For more information, see the Face limited access page.

Get started with facial recognition using the Face client library for .NET. The Azure AI Face service provides you with access to advanced algorithms for detecting and recognizing human faces in images. Follow these steps to install the package and try out the example code for basic face identification using remote images.

Reference documentation | Library source code | Package (NuGet) | Samples

Prerequisites

  • Azure subscription - Create one for free
  • The Visual Studio IDE or current version of .NET Core.
  • Your Azure account must have a Cognitive Services Contributor role assigned in order for you to agree to the responsible AI terms and create a resource. To get this role assigned to your account, follow the steps in the Assign roles documentation, or contact your administrator.
  • Once you have your Azure subscription, create a Face resource in the Azure portal to get your key and endpoint. After it deploys, select Go to resource.
    • You'll need the key and endpoint from the resource you create to connect your application to the Face API.
    • You can use the free pricing tier (F0) to try the service, and upgrade later to a paid tier for production.

Create environment variables

In this example, write your credentials to environment variables on the local machine that runs the application.

Go to the Azure portal. If the resource you created in the Prerequisites section deployed successfully, select Go to resource under Next Steps. You can find your key and endpoint under Resource Management in the Keys and Endpoint page. Your resource key isn't the same as your Azure subscription ID.

Tip

Don't include the key directly in your code, and never post it publicly. See the Azure AI services security article for more authentication options like Azure Key Vault.

To set the environment variable for your key and endpoint, open a console window and follow the instructions for your operating system and development environment.

  1. To set the FACE_APIKEY environment variable, replace <your_key> with one of the keys for your resource.
  2. To set the FACE_ENDPOINT environment variable, replace <your_endpoint> with the endpoint for your resource.
setx FACE_APIKEY <your_key>

setx FACE_ENDPOINT <your_endpoint>

After you add the environment variables, you may need to restart any running programs that will read the environment variables, including the console window.

Identify and verify faces

  1. Create a new C# application

    Using Visual Studio, create a new .NET Core application.

    Install the client library

    Once you've created a new project, install the client library by right-clicking on the project solution in the Solution Explorer and selecting Manage NuGet Packages. In the package manager that opens select Browse, check Include prerelease, and search for Azure.AI.Vision.Face. Select the latest version, and then Install.

  2. Add the following code into the Program.cs file.

    Note

    If you haven't received access to the Face service using the intake form, some of these functions won't work.

    using System.Net.Http.Headers;
using System.Text;

using Azure;
using Azure.AI.Vision.Face;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace FaceQuickstart
{
    class Program
    {
        static readonly string personGroupId = Guid.NewGuid().ToString();

        // URL path for the images.
        const string IMAGE_BASE_URL = "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/";

        // From your Face subscription in the Azure portal, get your subscription key and endpoint.
        static readonly string SUBSCRIPTION_KEY = Environment.GetEnvironmentVariable("FACE_APIKEY") ?? "<apikey>";
        static readonly string ENDPOINT = Environment.GetEnvironmentVariable("FACE_ENDPOINT") ?? "<endpoint>";

        static void Main(string[] args)
        {
            // Recognition model 4 was released in 2021 February.
            // It is recommended since its accuracy is improved
            // on faces wearing masks compared with model 3,
            // and its overall accuracy is improved compared
            // with models 1 and 2.
            FaceRecognitionModel RECOGNITION_MODEL4 = FaceRecognitionModel.Recognition04;

            // Authenticate.
            FaceClient client = Authenticate(ENDPOINT, SUBSCRIPTION_KEY);

            // Identify - recognize a face(s) in a person group (a person group is created in this example).
            IdentifyInPersonGroup(client, IMAGE_BASE_URL, RECOGNITION_MODEL4).Wait();

            Console.WriteLine("End of quickstart.");
        }

        /*
         *	AUTHENTICATE
         *	Uses subscription key and region to create a client.
         */
        public static FaceClient Authenticate(string endpoint, string key)
        {
            return new FaceClient(new Uri(endpoint), new AzureKeyCredential(key));
        }

        // Detect faces from image url for recognition purposes. This is a helper method for other functions in this quickstart.
        // Parameter `returnFaceId` of `DetectAsync` must be set to `true` (by default) for recognition purposes.
        // Parameter `returnFaceAttributes` is set to include the QualityForRecognition attribute. 
        // Recognition model must be set to recognition_03 or recognition_04 as a result.
        // Result faces with insufficient quality for recognition are filtered out. 
        // The field `faceId` in returned `DetectedFace`s will be used in Verify and Identify.
        // It will expire 24 hours after the detection call.
        private static async Task<List<FaceDetectionResult>> DetectFaceRecognize(FaceClient faceClient, string url, FaceRecognitionModel recognition_model)
        {
            // Detect faces from image URL.
            Response<IReadOnlyList<FaceDetectionResult>> response = await faceClient.DetectAsync(new Uri(url), FaceDetectionModel.Detection03, recognition_model, returnFaceId: true, [FaceAttributeType.QualityForRecognition]);
            IReadOnlyList<FaceDetectionResult> detectedFaces = response.Value;
            List<FaceDetectionResult> sufficientQualityFaces = new List<FaceDetectionResult>();
            foreach (FaceDetectionResult detectedFace in detectedFaces)
            {
                var faceQualityForRecognition = detectedFace.FaceAttributes.QualityForRecognition;
                if (faceQualityForRecognition.HasValue && (faceQualityForRecognition.Value != QualityForRecognition.Low))
                {
                    sufficientQualityFaces.Add(detectedFace);
                }
            }
            Console.WriteLine($"{detectedFaces.Count} face(s) with {sufficientQualityFaces.Count} having sufficient quality for recognition detected from image `{Path.GetFileName(url)}`");

            return sufficientQualityFaces;
        }

        /*
         * IDENTIFY FACES
         * To identify faces, you need to create and define a person group.
         * The Identify operation takes one or several face IDs from DetectedFace or PersistedFace and a PersonGroup and returns 
         * a list of Person objects that each face might belong to. Returned Person objects are wrapped as Candidate objects, 
         * which have a prediction confidence value.
         */
        public static async Task IdentifyInPersonGroup(FaceClient client, string url, FaceRecognitionModel recognitionModel)
        {
            Console.WriteLine("========IDENTIFY FACES========");
            Console.WriteLine();

            // Create a dictionary for all your images, grouping similar ones under the same key.
            Dictionary<string, string[]> personDictionary =
                new Dictionary<string, string[]>
                    { { "Family1-Dad", new[] { "Family1-Dad1.jpg", "Family1-Dad2.jpg" } },
                      { "Family1-Mom", new[] { "Family1-Mom1.jpg", "Family1-Mom2.jpg" } },
                      { "Family1-Son", new[] { "Family1-Son1.jpg", "Family1-Son2.jpg" } }
                    };
            // A group photo that includes some of the persons you seek to identify from your dictionary.
            string sourceImageFileName = "identification1.jpg";

            // Create a person group.
            Console.WriteLine($"Create a person group ({personGroupId}).");
            HttpClient httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", SUBSCRIPTION_KEY);
            using (var content = new ByteArrayContent(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new Dictionary<string, object> { ["name"] = personGroupId, ["recognitionModel"] = recognitionModel.ToString() }))))
            {
                content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                await httpClient.PutAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}", content);
            }
            // The similar faces will be grouped into a single person group person.
            foreach (var groupedFace in personDictionary.Keys)
            {
                // Limit TPS
                await Task.Delay(250);
                string? personId = null;
                using (var content = new ByteArrayContent(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new Dictionary<string, object> { ["name"] = groupedFace }))))
                {
                    content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    using (var response = await httpClient.PostAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}/persons", content))
                    {
                        string contentString = await response.Content.ReadAsStringAsync();
                        personId = (string?)(JsonConvert.DeserializeObject<Dictionary<string, object>>(contentString)?["personId"]);
                    }
                }
                Console.WriteLine($"Create a person group person '{groupedFace}'.");

                // Add face to the person group person.
                foreach (var similarImage in personDictionary[groupedFace])
                {
                    Console.WriteLine($"Check whether image is of sufficient quality for recognition");
                    Response<IReadOnlyList<FaceDetectionResult>> response = await client.DetectAsync(new Uri($"{url}{similarImage}"), FaceDetectionModel.Detection03, recognitionModel, returnFaceId: false, [FaceAttributeType.QualityForRecognition]);
                    IReadOnlyList<FaceDetectionResult> detectedFaces1 = response.Value;
                    bool sufficientQuality = true;
                    foreach (var face1 in detectedFaces1)
                    {
                        var faceQualityForRecognition = face1.FaceAttributes.QualityForRecognition;
                        //  Only "high" quality images are recommended for person enrollment
                        if (faceQualityForRecognition.HasValue && (faceQualityForRecognition.Value != QualityForRecognition.High))
                        {
                            sufficientQuality = false;
                            break;
                        }
                    }

                    if (!sufficientQuality)
                    {
                        continue;
                    }

                    if (detectedFaces1.Count != 1)
                    {
                        continue;
                    }

                    // add face to the person group
                    Console.WriteLine($"Add face to the person group person({groupedFace}) from image `{similarImage}`");
                    using (var content = new ByteArrayContent(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new Dictionary<string, object> { ["url"] = $"{url}{similarImage}" }))))
                    {
                        content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                        await httpClient.PostAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}/persons/{personId}/persistedfaces?detectionModel=detection_03", content);
                    }
                }
            }

            // Start to train the person group.
            Console.WriteLine();
            Console.WriteLine($"Train person group {personGroupId}.");
            await httpClient.PostAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}/train", null);

            // Wait until the training is completed.
            while (true)
            {
                await Task.Delay(1000);
                string? trainingStatus = null;
                using (var response = await httpClient.GetAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}/training"))
                {
                    string contentString = await response.Content.ReadAsStringAsync();
                    trainingStatus = (string?)(JsonConvert.DeserializeObject<Dictionary<string, object>>(contentString)?["status"]);
                }
                Console.WriteLine($"Training status: {trainingStatus}.");
                if ("succeeded".Equals(trainingStatus)) { break; }
            }
            Console.WriteLine();

            Console.WriteLine("Pausing for 60 seconds to avoid triggering rate limit on free account...");
            await Task.Delay(60000);

            List<Guid> sourceFaceIds = new List<Guid>();
            // Detect faces from source image url.
            List<FaceDetectionResult> detectedFaces = await DetectFaceRecognize(client, $"{url}{sourceImageFileName}", recognitionModel);

            // Add detected faceId to sourceFaceIds.
            foreach (var detectedFace in detectedFaces) { sourceFaceIds.Add(detectedFace.FaceId.Value); }

            // Identify the faces in a person group.
            List<Dictionary<string, object>> identifyResults = new List<Dictionary<string, object>>();
            using (var content = new ByteArrayContent(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new Dictionary<string, object> { ["faceIds"] = sourceFaceIds, ["largePersonGroupId"] = personGroupId }))))
            {
                content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                using (var response = await httpClient.PostAsync($"{ENDPOINT}/face/v1.0/identify", content))
                {
                    string contentString = await response.Content.ReadAsStringAsync();
                    identifyResults = JsonConvert.DeserializeObject<List<Dictionary<string, object>>>(contentString) ?? [];
                }
            }

            foreach (var identifyResult in identifyResults)
            {
                string faceId = (string)identifyResult["faceId"];
                List<Dictionary<string, object>> candidates = JsonConvert.DeserializeObject<List<Dictionary<string, object>>>(((JArray)identifyResult["candidates"]).ToString()) ?? [];
                if (candidates.Count == 0)
                {
                    Console.WriteLine($"No person is identified for the face in: {sourceImageFileName} - {faceId},");
                    continue;
                }

                string? personName = null;
                using (var response = await httpClient.GetAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}/persons/{candidates.First()["personId"]}"))
                {
                    string contentString = await response.Content.ReadAsStringAsync();
                    personName = (string?)(JsonConvert.DeserializeObject<Dictionary<string, object>>(contentString)?["name"]);
                }
                Console.WriteLine($"Person '{personName}' is identified for the face in: {sourceImageFileName} - {faceId}," +
                    $" confidence: {candidates.First()["confidence"]}.");

                Dictionary<string, object> verifyResult = new Dictionary<string, object>();
                using (var content = new ByteArrayContent(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new Dictionary<string, object> { ["faceId"] = faceId, ["personId"] = candidates.First()["personId"], ["largePersonGroupId"] = personGroupId }))))
                {
                    content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    using (var response = await httpClient.PostAsync($"{ENDPOINT}/face/v1.0/verify", content))
                    {
                        string contentString = await response.Content.ReadAsStringAsync();
                        verifyResult = JsonConvert.DeserializeObject<Dictionary<string, object>>(contentString) ?? [];
                    }
                }
                Console.WriteLine($"Verification result: is a match? {verifyResult["isIdentical"]}. confidence: {verifyResult["confidence"]}");
            }
            Console.WriteLine();

            // Delete person group.
            Console.WriteLine("========DELETE PERSON GROUP========");
            Console.WriteLine();
            await httpClient.DeleteAsync($"{ENDPOINT}/face/v1.0/largepersongroups/{personGroupId}");
            Console.WriteLine($"Deleted the person group {personGroupId}.");
            Console.WriteLine();
        }
    }
}

  3. Run the application

    Run the application by clicking the Debug button at the top of the IDE window.

Output

========IDENTIFY FACES========

Create a person group (18d1c443-a01b-46a4-9191-121f74a831cd).
Create a person group person 'Family1-Dad'.
Check whether image is of sufficient quality for recognition
Add face to the person group person(Family1-Dad) from image `Family1-Dad1.jpg`
Check whether image is of sufficient quality for recognition
Add face to the person group person(Family1-Dad) from image `Family1-Dad2.jpg`
Create a person group person 'Family1-Mom'.
Check whether image is of sufficient quality for recognition
Add face to the person group person(Family1-Mom) from image `Family1-Mom1.jpg`
Check whether image is of sufficient quality for recognition
Add face to the person group person(Family1-Mom) from image `Family1-Mom2.jpg`
Create a person group person 'Family1-Son'.
Check whether image is of sufficient quality for recognition
Add face to the person group person(Family1-Son) from image `Family1-Son1.jpg`
Check whether image is of sufficient quality for recognition
Add face to the person group person(Family1-Son) from image `Family1-Son2.jpg`

Train person group 18d1c443-a01b-46a4-9191-121f74a831cd.
Training status: succeeded.

Pausing for 60 seconds to avoid triggering rate limit on free account...
4 face(s) with 4 having sufficient quality for recognition detected from image `identification1.jpg`
Person 'Family1-Dad' is identified for the face in: identification1.jpg - ad813534-9141-47b4-bfba-24919223966f, confidence: 0.96807.
Verification result: is a match? True. confidence: 0.96807
Person 'Family1-Mom' is identified for the face in: identification1.jpg - 1a39420e-f517-4cee-a898-5d968dac1a7e, confidence: 0.96902.
Verification result: is a match? True. confidence: 0.96902
No person is identified for the face in: identification1.jpg - 889394b1-e30f-4147-9be1-302beb5573f3,
Person 'Family1-Son' is identified for the face in: identification1.jpg - 0557d87b-356c-48a8-988f-ce0ad2239aa5, confidence: 0.9281.
Verification result: is a match? True. confidence: 0.9281

========DELETE PERSON GROUP========

Deleted the person group 18d1c443-a01b-46a4-9191-121f74a831cd.

End of quickstart.

Tip

The Face API runs on a set of pre-built models that are static by nature (the model's performance will not regress or improve as the service is run). The results that the model produces might change if Microsoft updates the model's backend without migrating to an entirely new model version. To take advantage of a newer version of a model, you can retrain your PersonGroup, specifying the newer model as a parameter with the same enrollment images.

Clean up resources

If you want to clean up and remove an Azure AI services subscription, you can delete the resource or resource group. Deleting the resource group also deletes any other resources associated with it.

Next steps

In this quickstart, you learned how to use the Face client library for .NET to do basic face identification. Next, learn about the different face detection models and how to specify the right model for your use case.

Specify a face detection model version

Get started with facial recognition using the Face client library for Python. Follow these steps to install the package and try out the example code for basic tasks. The Face service provides you with access to advanced algorithms for detecting and recognizing human faces in images. Follow these steps to install the package and try out the example code for basic face identification using remote images.

Reference documentation | Library source code | Package (PiPy) | Samples

Prerequisites

  • Azure subscription - Create one for free
  • Python 3.x
    • Your Python installation should include pip. You can check if you have pip installed by running pip --version on the command line. Get pip by installing the latest version of Python.
  • Your Azure account must have a Cognitive Services Contributor role assigned in order for you to agree to the responsible AI terms and create a resource. To get this role assigned to your account, follow the steps in the Assign roles documentation, or contact your administrator.
  • Once you have your Azure subscription, create a Face resource in the Azure portal to get your key and endpoint. After it deploys, select Go to resource.
    • You'll need the key and endpoint from the resource you create to connect your application to the Face API.
    • You can use the free pricing tier (F0) to try the service, and upgrade later to a paid tier for production.

Create environment variables

In this example, write your credentials to environment variables on the local machine that runs the application.

Go to the Azure portal. If the resource you created in the Prerequisites section deployed successfully, select Go to resource under Next Steps. You can find your key and endpoint under Resource Management in the Keys and Endpoint page. Your resource key isn't the same as your Azure subscription ID.

Tip

Don't include the key directly in your code, and never post it publicly. See the Azure AI services security article for more authentication options like Azure Key Vault.

To set the environment variable for your key and endpoint, open a console window and follow the instructions for your operating system and development environment.

  1. To set the FACE_APIKEY environment variable, replace <your_key> with one of the keys for your resource.
  2. To set the FACE_ENDPOINT environment variable, replace <your_endpoint> with the endpoint for your resource.
setx FACE_APIKEY <your_key>

setx FACE_ENDPOINT <your_endpoint>

After you add the environment variables, you may need to restart any running programs that will read the environment variables, including the console window.

Identify and verify faces

  1. Install the client library

    After installing Python, you can install the client library with:

    pip install --upgrade azure-ai-vision-face

  2. Create a new Python application

    Create a new Python script—quickstart-file.py, for example. Then open it in your preferred editor or IDE and paste in the following code.

    Note

    If you haven't received access to the Face service using the intake form, some of these functions won't work.

    import os
import time
import uuid
import requests

from azure.core.credentials import AzureKeyCredential
from azure.ai.vision.face import FaceClient
from azure.ai.vision.face.models import (
    FaceAttributeTypeRecognition04,
    FaceDetectionModel,
    FaceRecognitionModel,
    QualityForRecognition,
)


# This key will serve all examples in this document.
KEY = os.environ["FACE_APIKEY"]

# This endpoint will be used in all examples in this quickstart.
ENDPOINT = os.environ["FACE_ENDPOINT"]

# Used in the Person Group Operations and Delete Person Group examples.
# PERSON_GROUP_ID should be all lowercase and alphanumeric. For example, 'mygroupname' (dashes are OK).
PERSON_GROUP_ID = str(uuid.uuid4())  # assign a random ID (or name it anything)

HEADERS = {"Ocp-Apim-Subscription-Key": KEY, "Content-Type": "application/json"}

# Create an authenticated FaceClient.
with FaceClient(endpoint=ENDPOINT, credential=AzureKeyCredential(KEY)) as face_client:
    '''
    Create the PersonGroup
    '''
    # Create empty Person Group. Person Group ID must be lower case, alphanumeric, and/or with '-', '_'.
    print("Person group:", PERSON_GROUP_ID)
    response = requests.put(
        ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}",
        headers=HEADERS,
        json={"name": PERSON_GROUP_ID, "recognitionModel": "recognition_04"})
    response.raise_for_status()

    # Define woman friend
    response = requests.post(ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/persons", headers=HEADERS, json={"name": "Woman"})
    response.raise_for_status()
    woman = response.json()
    # Define man friend
    response = requests.post(ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/persons", headers=HEADERS, json={"name": "Man"})
    response.raise_for_status()
    man = response.json()
    # Define child friend
    response = requests.post(ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/persons", headers=HEADERS, json={"name": "Child"})
    response.raise_for_status()
    child = response.json()

    '''
    Detect faces and register them to each person
    '''
    # Find all jpeg images of friends in working directory (TBD pull from web instead)
    woman_images = [
        "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Mom1.jpg",  # noqa: E501
        "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Mom2.jpg",  # noqa: E501
    ]
    man_images = [
        "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Dad1.jpg",  # noqa: E501
        "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Dad2.jpg",  # noqa: E501
    ]
    child_images = [
        "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Son1.jpg",  # noqa: E501
        "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Son2.jpg",  # noqa: E501
    ]

    # Add to woman person
    for image in woman_images:
        # Check if the image is of sufficent quality for recognition.
        sufficientQuality = True
        detected_faces = face_client.detect_from_url(
            url=image,
            detection_model=FaceDetectionModel.DETECTION_03,
            recognition_model=FaceRecognitionModel.RECOGNITION_04,
            return_face_id=True,
            return_face_attributes=[FaceAttributeTypeRecognition04.QUALITY_FOR_RECOGNITION])
        for face in detected_faces:
            if face.face_attributes.quality_for_recognition != QualityForRecognition.HIGH:
                sufficientQuality = False
                break

        if not sufficientQuality:
            continue

        if len(detected_faces) != 1:
            continue

        response = requests.post(
            ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/persons/{woman['personId']}/persistedFaces",
            headers=HEADERS,
            json={"url": image})
        response.raise_for_status()
        print(f"face {face.face_id} added to person {woman['personId']}")


    # Add to man person
    for image in man_images:
        # Check if the image is of sufficent quality for recognition.
        sufficientQuality = True
        detected_faces = face_client.detect_from_url(
            url=image,
            detection_model=FaceDetectionModel.DETECTION_03,
            recognition_model=FaceRecognitionModel.RECOGNITION_04,
            return_face_id=True,
            return_face_attributes=[FaceAttributeTypeRecognition04.QUALITY_FOR_RECOGNITION])
        for face in detected_faces:
            if face.face_attributes.quality_for_recognition != QualityForRecognition.HIGH:
                sufficientQuality = False
                break

        if not sufficientQuality:
            continue

        if len(detected_faces) != 1:
            continue

        response = requests.post(
            ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/persons/{man['personId']}/persistedFaces",
            headers=HEADERS,
            json={"url": image})
        response.raise_for_status()
        print(f"face {face.face_id} added to person {man['personId']}")

    # Add to child person
    for image in child_images:
        # Check if the image is of sufficent quality for recognition.
        sufficientQuality = True
        detected_faces = face_client.detect_from_url(
            url=image,
            detection_model=FaceDetectionModel.DETECTION_03,
            recognition_model=FaceRecognitionModel.RECOGNITION_04,
            return_face_id=True,
            return_face_attributes=[FaceAttributeTypeRecognition04.QUALITY_FOR_RECOGNITION])
        for face in detected_faces:
            if face.face_attributes.quality_for_recognition != QualityForRecognition.HIGH:
                sufficientQuality = False
                break
        if not sufficientQuality:
            continue

        if len(detected_faces) != 1:
            continue

        response = requests.post(
            ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/persons/{child['personId']}/persistedFaces",
            headers=HEADERS,
            json={"url": image})
        response.raise_for_status()
        print(f"face {face.face_id} added to person {child['personId']}")

    '''
    Train PersonGroup
    '''
    # Train the person group
    print(f"Train the person group {PERSON_GROUP_ID}")
    response = requests.post(ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/train", headers=HEADERS)
    response.raise_for_status()

    while (True):
        response = requests.get(ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}/training", headers=HEADERS)
        response.raise_for_status()
        training_status = response.json()["status"]
        if training_status == "succeeded":
            break
    print(f"The person group {PERSON_GROUP_ID} is trained successfully.")

    '''
    Identify a face against a defined PersonGroup
    '''
    # Group image for testing against
    test_image = "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/identification1.jpg"  # noqa: E501

    print("Pausing for 60 seconds to avoid triggering rate limit on free account...")
    time.sleep(60)

    # Detect faces
    face_ids = []
    # We use detection model 03 to get better performance, recognition model 04 to support quality for
    # recognition attribute.
    faces = face_client.detect_from_url(
        url=test_image,
        detection_model=FaceDetectionModel.DETECTION_03,
        recognition_model=FaceRecognitionModel.RECOGNITION_04,
        return_face_id=True,
        return_face_attributes=[FaceAttributeTypeRecognition04.QUALITY_FOR_RECOGNITION])
    for face in faces:
        # Only take the face if it is of sufficient quality.
        if face.face_attributes.quality_for_recognition != QualityForRecognition.LOW:
            face_ids.append(face.face_id)

    # Identify faces
    response = requests.post(
        ENDPOINT + f"/face/v1.0/identify",
        headers=HEADERS,
        json={"faceIds": face_ids, "largePersonGroupId": PERSON_GROUP_ID})
    response.raise_for_status()
    results = response.json()
    print("Identifying faces in image")
    if not results:
        print("No person identified in the person group")
    for identifiedFace in results:
        if len(identifiedFace["candidates"]) > 0:
            print(f"Person is identified for face ID {identifiedFace['faceId']} in image, with a confidence of "
                  f"{identifiedFace['candidates'][0]['confidence']}.")  # Get topmost confidence score

            # Verify faces
            response = requests.post(
                ENDPOINT + f"/face/v1.0/verify",
                headers=HEADERS,
                json={"faceId": identifiedFace["faceId"], "personId": identifiedFace["candidates"][0]["personId"], "largePersonGroupId": PERSON_GROUP_ID})
            response.raise_for_status()
            verify_result = response.json()
            print(f"verification result: {verify_result['isIdentical']}. confidence: {verify_result['confidence']}")
        else:
            print(f"No person identified for face ID {identifiedFace['faceId']} in image.")

    print()

    # Delete the person group
    response = requests.delete(ENDPOINT + f"/face/v1.0/largepersongroups/{PERSON_GROUP_ID}", headers=HEADERS)
    response.raise_for_status()
    print(f"The person group {PERSON_GROUP_ID} is deleted.")

    print()
    print("End of quickstart.")

  3. Run your face recognition app from the application directory with the python command.

    python quickstart-file.py

    Tip

    The Face API runs on a set of pre-built models that are static by nature (the model's performance will not regress or improve as the service is run). The results that the model produces might change if Microsoft updates the model's backend without migrating to an entirely new model version. To take advantage of a newer version of a model, you can retrain your PersonGroup, specifying the newer model as a parameter with the same enrollment images.

Output

Person group: ad12b2db-d892-48ec-837a-0e7168c18224
face 335a2cb1-5211-4c29-9c45-776dd014b2af added to person 9ee65510-81a5-47e5-9e50-66727f719465
face df57eb50-4a13-4f93-b804-cd108327ad5a added to person 9ee65510-81a5-47e5-9e50-66727f719465
face d8b7b8b8-3ca6-4309-b76e-eeed84f7738a added to person 00651036-4236-4004-88b9-11466c251548
face dffbb141-f40b-4392-8785-b6c434fa534e added to person 00651036-4236-4004-88b9-11466c251548
face 9cdac36e-5455-447b-a68d-eb1f5e2ec27d added to person 23614724-b132-407a-aaa0-67003987ce93
face d8208412-92b7-4b8d-a2f8-3926c839c87e added to person 23614724-b132-407a-aaa0-67003987ce93
Train the person group ad12b2db-d892-48ec-837a-0e7168c18224
The person group ad12b2db-d892-48ec-837a-0e7168c18224 is trained successfully.
Pausing for 60 seconds to avoid triggering rate limit on free account...
Identifying faces in image
Person is identified for face ID bc52405a-5d83-4500-9218-557468ccdf99 in image, with a confidence of 0.96726.
verification result: True. confidence: 0.96726
Person is identified for face ID dfcc3fc8-6252-4f3a-8205-71466f39d1a7 in image, with a confidence of 0.96925.
verification result: True. confidence: 0.96925
No person identified for face ID 401c581b-a178-45ed-8205-7692f6eede88 in image.
Person is identified for face ID 8809d9c7-e362-4727-8c95-e1e44f5c2e8a in image, with a confidence of 0.92898.
verification result: True. confidence: 0.92898

The person group ad12b2db-d892-48ec-837a-0e7168c18224 is deleted.

End of quickstart.

Clean up resources

If you want to clean up and remove an Azure AI services subscription, you can delete the resource or resource group. Deleting the resource group also deletes any other resources associated with it.

Next steps

In this quickstart, you learned how to use the Face client library for Python to do basic face identification. Next, learn about the different face detection models and how to specify the right model for your use case.

Specify a face detection model version

Get started with facial recognition using the Face client library for JavaScript. Follow these steps to install the package and try out the example code for basic tasks. The Face service provides you with access to advanced algorithms for detecting and recognizing human faces in images. Follow these steps to install the package and try out the example code for basic face identification using remote images.

Reference documentation | Library source code | Package (npm) | Samples

Prerequisites

  • Azure subscription - Create one for free
  • The latest version of Node.js
  • Your Azure account must have a Cognitive Services Contributor role assigned in order for you to agree to the responsible AI terms and create a resource. To get this role assigned to your account, follow the steps in the Assign roles documentation, or contact your administrator.
  • Once you have your Azure subscription, Create a Face resource in the Azure portal to get your key and endpoint. After it deploys, select Go to resource.
    • You'll need the key and endpoint from the resource you create to connect your application to the Face API.
    • You can use the free pricing tier (F0) to try the service, and upgrade later to a paid tier for production.

Create environment variables

In this example, write your credentials to environment variables on the local machine that runs the application.

Go to the Azure portal. If the resource you created in the Prerequisites section deployed successfully, select Go to resource under Next Steps. You can find your key and endpoint under Resource Management in the Keys and Endpoint page. Your resource key isn't the same as your Azure subscription ID.

Tip

Don't include the key directly in your code, and never post it publicly. See the Azure AI services security article for more authentication options like Azure Key Vault.

To set the environment variable for your key and endpoint, open a console window and follow the instructions for your operating system and development environment.

  1. To set the FACE_APIKEY environment variable, replace <your_key> with one of the keys for your resource.
  2. To set the FACE_ENDPOINT environment variable, replace <your_endpoint> with the endpoint for your resource.
setx FACE_APIKEY <your_key>

setx FACE_ENDPOINT <your_endpoint>

After you add the environment variables, you may need to restart any running programs that will read the environment variables, including the console window.

Identify and verify faces

  1. Create a new Node.js application

    In a console window (such as cmd, PowerShell, or Bash), create a new directory for your app, and navigate to it.

    mkdir myapp && cd myapp

    Run the npm init command to create a node application with a package.json file.

    npm init

  2. Install the @azure-rest/ai-vision-face npm packages:

    npm install @azure-rest/ai-vision-face

    Your app's package.json file is updated with the dependencies.

  3. Create a file named index.js, open it in a text editor, and paste in the following code:

    Note

    If you haven't received access to the Face service using the intake form, some of these functions won't work.

    const { randomUUID } = require("crypto");

const { AzureKeyCredential } = require("@azure/core-auth");

const createFaceClient = require("@azure-rest/ai-vision-face").default,
  { getLongRunningPoller } = require("@azure-rest/ai-vision-face");

const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

const main = async () => {
  const endpoint = process.env["FACE_ENDPOINT"] ?? "<endpoint>";
  const apikey = process.env["FACE_APIKEY"] ?? "<apikey>";
  const credential = new AzureKeyCredential(apikey);
  const client = createFaceClient(endpoint, credential);

  const imageBaseUrl =
    "https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/";
  const personGroupId = randomUUID();

  console.log("========IDENTIFY FACES========");
  console.log();

  // Create a dictionary for all your images, grouping similar ones under the same key.
  const personDictionary = {
    "Family1-Dad": ["Family1-Dad1.jpg", "Family1-Dad2.jpg"],
    "Family1-Mom": ["Family1-Mom1.jpg", "Family1-Mom2.jpg"],
    "Family1-Son": ["Family1-Son1.jpg", "Family1-Son2.jpg"],
  };

  // A group photo that includes some of the persons you seek to identify from your dictionary.
  const sourceImageFileName = "identification1.jpg";

  // Create a person group.
  console.log(`Creating a person group with ID: ${personGroupId}`);
  await client.path("/largepersongroups/{personGroupId}", personGroupId).put({
    body: {
      name: personGroupId,
      recognitionModel: "recognition_04",
    },
  });

  // The similar faces will be grouped into a single person group person.
  console.log("Adding faces to person group...");
  await Promise.all(
    Object.keys(personDictionary).map(async (name) => {
      console.log(`Create a persongroup person: ${name}`);
      const createPersonGroupPersonResponse = await client
        .path("/largepersongroups/{personGroupId}/persons", personGroupId)
        .post({
          body: { name },
        });

      const { personId } = createPersonGroupPersonResponse.body;

      await Promise.all(
        personDictionary[name].map(async (similarImage) => {
          // Check if the image is of sufficent quality for recognition.
          const detectResponse = await client.path("/detect").post({
            contentType: "application/json",
            queryParameters: {
              detectionModel: "detection_03",
              recognitionModel: "recognition_04",
              returnFaceId: false,
              returnFaceAttributes: ["qualityForRecognition"],
            },
            body: { url: `${imageBaseUrl}${similarImage}` },
          });

          const sufficientQuality = detectResponse.body.every(
            (face) => face.faceAttributes?.qualityForRecognition === "high",
          );
          if (!sufficientQuality) {
            return;
          }

          if (detectResponse.body.length != 1) {
            return;
          }

          // Quality is sufficent, add to group.
          console.log(
            `Add face to the person group person: (${name}) from image: (${similarImage})`,
          );
          await client
            .path(
              "/largepersongroups/{personGroupId}/persons/{personId}/persistedfaces",
              personGroupId,
              personId,
            )
            .post({
              queryParameters: { detectionModel: "detection_03" },
              body: { url: `${imageBaseUrl}${similarImage}` },
            });
        }),
      );
    }),
  );
  console.log("Done adding faces to person group.");

  // Start to train the person group.
  console.log();
  console.log(`Training person group: ${personGroupId}`);
  const trainResponse = await client
    .path("/largepersongroups/{personGroupId}/train", personGroupId)
    .post();
  const poller = await getLongRunningPoller(client, trainResponse);
  await poller.pollUntilDone();
  console.log(`Training status: ${poller.getOperationState().status}`);
  if (poller.getOperationState().status !== "succeeded") {
    return;
  }

  console.log("Pausing for 60 seconds to avoid triggering rate limit on free account...");
  await sleep(60000);

  // Detect faces from source image url and only take those with sufficient quality for recognition.
  const detectResponse = await client.path("/detect").post({
    contentType: "application/json",
    queryParameters: {
      detectionModel: "detection_03",
      recognitionModel: "recognition_04",
      returnFaceId: true,
      returnFaceAttributes: ["qualityForRecognition"],
    },
    body: { url: `${imageBaseUrl}${sourceImageFileName}` },
  });
  const faceIds = detectResponse.body.filter((face) => face.faceAttributes?.qualityForRecognition !== "low").map((face) => face.faceId);

  // Identify the faces in a person group.
  const identifyResponse = await client.path("/identify").post({
    body: { faceIds, largePersonGroupId: personGroupId },
  });
  await Promise.all(
    identifyResponse.body.map(async (result) => {
      try {
        const getPersonGroupPersonResponse = await client
          .path(
            "/largepersongroups/{personGroupId}/persons/{personId}",
            personGroupId,
            result.candidates[0].personId,
          )
          .get();
        const person = getPersonGroupPersonResponse.body;
        console.log(
          `Person: ${person.name} is identified for face in: ${sourceImageFileName} with ID: ${result.faceId}. Confidence: ${result.candidates[0].confidence}`,
        );

        // Verification:
        const verifyResponse = await client.path("/verify").post({
          body: {
            faceId: result.faceId,
            largePersonGroupId: personGroupId,
            personId: person.personId,
          },
        });
        console.log(
          `Verification result between face ${result.faceId} and person ${person.personId}: ${verifyResponse.body.isIdentical} with confidence: ${verifyResponse.body.confidence}`,
        );
      } catch (error) {
        console.log(`No persons identified for face with ID ${result.faceId}`);
      }
    }),
  );
  console.log();

  // Delete person group.
  console.log(`Deleting person group: ${personGroupId}`);
  await client.path("/largepersongroups/{personGroupId}", personGroupId).delete();
  console.log();

  console.log("Done.");
};

main().catch(console.error);

  4. Run the application with the node command on your quickstart file.

    node index.js

Output

========IDENTIFY FACES========

Creating a person group with ID: a230ac8b-09b2-4fa0-ae04-d76356d88d9f
Adding faces to person group...
Create a persongroup person: Family1-Dad
Create a persongroup person: Family1-Mom
Create a persongroup person: Family1-Son
Add face to the person group person: (Family1-Dad) from image: (Family1-Dad1.jpg)
Add face to the person group person: (Family1-Mom) from image: (Family1-Mom1.jpg)
Add face to the person group person: (Family1-Son) from image: (Family1-Son1.jpg)
Add face to the person group person: (Family1-Dad) from image: (Family1-Dad2.jpg)
Add face to the person group person: (Family1-Mom) from image: (Family1-Mom2.jpg)
Add face to the person group person: (Family1-Son) from image: (Family1-Son2.jpg)
Done adding faces to person group.

Training person group: a230ac8b-09b2-4fa0-ae04-d76356d88d9f
Training status: succeeded
Pausing for 60 seconds to avoid triggering rate limit on free account...
No persons identified for face with ID 56380623-8bf0-414a-b9d9-c2373386b7be
Person: Family1-Dad is identified for face in: identification1.jpg with ID: c45052eb-a910-4fd3-b1c3-f91ccccc316a. Confidence: 0.96807
Person: Family1-Son is identified for face in: identification1.jpg with ID: 8dce9b50-513f-4fe2-9e19-352acfd622b3. Confidence: 0.9281
Person: Family1-Mom is identified for face in: identification1.jpg with ID: 75868da3-66f6-4b5f-a172-0b619f4d74c1. Confidence: 0.96902
Verification result between face c45052eb-a910-4fd3-b1c3-f91ccccc316a and person 35a58d14-fd58-4146-9669-82ed664da357: true with confidence: 0.96807
Verification result between face 8dce9b50-513f-4fe2-9e19-352acfd622b3 and person 2d4d196c-5349-431c-bf0c-f1d7aaa180ba: true with confidence: 0.9281
Verification result between face 75868da3-66f6-4b5f-a172-0b619f4d74c1 and person 35d5de9e-5f92-4552-8907-0d0aac889c3e: true with confidence: 0.96902

Deleting person group: a230ac8b-09b2-4fa0-ae04-d76356d88d9f

Done.

Clean up resources

If you want to clean up and remove an Azure AI services subscription, you can delete the resource or resource group. Deleting the resource group also deletes any other resources associated with it.

Next steps

In this quickstart, you learned how to use the Face client library for JavaScript to do basic face identification. Next, learn about the different face detection models and how to specify the right model for your use case.

Specify a face detection model version

Get started with facial recognition using the Face REST API. The Face service provides you with access to advanced algorithms for detecting and recognizing human faces in images.

Note

This quickstart uses cURL commands to call the REST API. You can also call the REST API using a programming language. Complex scenarios like face identification are easier to implement using a language SDK. See the GitHub samples for examples in C#, Python, Java, JavaScript, and Go.

Prerequisites

  • Azure subscription - Create one for free
  • Your Azure account must have a Cognitive Services Contributor role assigned in order for you to agree to the responsible AI terms and create a resource. To get this role assigned to your account, follow the steps in the Assign roles documentation, or contact your administrator.
  • Once you have your Azure subscription, create a Face resource in the Azure portal to get your key and endpoint. After it deploys, select Go to resource.
    • You'll need the key and endpoint from the resource you create to connect your application to the Face API. You'll paste your key and endpoint into the code below later in the quickstart.
    • You can use the free pricing tier (F0) to try the service, and upgrade later to a paid tier for production.
  • PowerShell version 6.0+, or a similar command-line application.
  • cURL installed.

Identify and verify faces

Note

If you haven't received access to the Face service using the intake form, some of these functions won't work.

  1. First, call the Detect API on the source face. This is the face that we'll try to identify from the larger group. Copy the following command to a text editor, insert your own key and endpoint, and then copy it into a shell window and run it.

    curl.exe -v -X POST "https://{resource endpoint}/face/v1.0/detect?returnFaceId=true&returnFaceLandmarks=false&recognitionModel=recognition_04&returnRecognitionModel=false&detectionModel=detection_03&faceIdTimeToLive=86400" -H "Content-Type: application/json" -H "Ocp-Apim-Subscription-Key: {subscription key}" --data-ascii "{""url"":""https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/identification1.jpg""}"

    Save the returned face ID string to a temporary location. You'll use it again at the end.

  2. Next you'll need to create a LargePersonGroup and give it an arbitrary ID that matches regex pattern ^[a-z0-9-_]+$. This object will store the aggregated face data of several persons. Run the following command, inserting your own key. Optionally, change the group's name and metadata in the request body.

    curl.exe -v -X PUT "https://{resource endpoint}/face/v1.0/largepersongroups/{largePersonGroupId}" -H "Content-Type: application/json" -H "Ocp-Apim-Subscription-Key: {subscription key}" --data-ascii "{
    ""name"": ""large-person-group-name"",
    ""userData"": ""User-provided data attached to the large person group."",
    ""recognitionModel"": ""recognition_04""
}"

    Save the specified ID of the created group to a temporary location.

  3. Next, you'll create Person objects that belong to the group. Run the following command, inserting your own key and the ID of the LargePersonGroup from the previous step. This command creates a Person named "Family1-Dad".

    curl.exe -v -X POST "https://{resource endpoint}/face/v1.0/largepersongroups/{largePersonGroupId}/persons" -H "Content-Type: application/json" -H "Ocp-Apim-Subscription-Key: {subscription key}" --data-ascii "{
    ""name"": ""Family1-Dad"",
    ""userData"": ""User-provided data attached to the person.""
}"

    After you run this command, run it again with different input data to create more Person objects: "Family1-Mom", "Family1-Son", "Family1-Daughter", "Family2-Lady", and "Family2-Man".

    Save the IDs of each Person created; it's important to keep track of which person name has which ID.

  4. Next you'll need to detect new faces and associate them with the Person objects that exist. The following command detects a face from the image Family1-Dad1.jpg and adds it to the corresponding person. You need to specify the personId as the ID that was returned when you created the "Family1-Dad" Person object. The image name corresponds to the name of the created Person. Also enter the LargePersonGroup ID and your key in the appropriate fields.

    curl.exe -v -X POST "https://{resource endpoint}/face/v1.0/largepersongroups/{largePersonGroupId}/persons/{personId}/persistedfaces?detectionModel=detection_03" -H "Content-Type: application/json" -H "Ocp-Apim-Subscription-Key: {subscription key}" --data-ascii "{""url"":""https://raw.githubusercontent.com/Azure-Samples/cognitive-services-sample-data-files/master/Face/images/Family1-Dad1.jpg""}"

    Then, run the above command again with a different source image and target Person. The images available are: Family1-Dad1.jpg, Family1-Dad2.jpg Family1-Mom1.jpg, Family1-Mom2.jpg, Family1-Son1.jpg, Family1-Son2.jpg, Family1-Daughter1.jpg, Family1-Daughter2.jpg, Family2-Lady1.jpg, Family2-Lady2.jpg, Family2-Man1.jpg, and Family2-Man2.jpg. Be sure that the Person whose ID you specify in the API call matches the name of the image file in the request body.

    At the end of this step, you should have multiple Person objects that each have one or more corresponding faces, detected directly from the provided images.

  5. Next, train the LargePersonGroup with the current face data. The training operation teaches the model how to associate facial features, sometimes aggregated from multiple source images, to each single person. Insert the LargePersonGroup ID and your key before running the command.

    curl.exe -v -X POST "https://{resource endpoint}/face/v1.0/largepersongroups/{largePersonGroupId}/train" -H "Ocp-Apim-Subscription-Key: {subscription key}" --data ""

  6. Check whether the training status is succeeded. If not, wait for a while and query again.

    curl.exe -v "https://{resource endpoint}/face/v1.0/largepersongroups/{largePersonGroupId}/training" -H "Ocp-Apim-Subscription-Key: {subscription key}"

  7. Now you're ready to call the Identify API, using the source face ID from the first step and the LargePersonGroup ID. Insert these values into the appropriate fields in the request body, and insert your key.

    curl.exe -v -X POST "https://{resource endpoint}/face/v1.0/identify" -H "Content-Type: application/json" -H "Ocp-Apim-Subscription-Key: {subscription key}" --data-ascii "{
    ""largePersonGroupId"": ""INSERT_PERSONGROUP_ID"",
    ""faceIds"": [
        ""INSERT_SOURCE_FACE_ID""
    ],
    ""maxNumOfCandidatesReturned"": 1,
    ""confidenceThreshold"": 0.5
}"

    The response should give you a Person ID indicating the person identified with the source face. It should be the ID that corresponds to the "Family1-Dad" person, because the source face is of that person.

  8. To do face verification, you'll use the Person ID returned in the previous step, the LargePersonGroup ID, and also the source face ID. Insert these values into the fields in the request body, and insert your key.

    curl.exe -v -X POST "https://{resource endpoint}/face/v1.0/verify" `
-H "Content-Type: application/json" `
-H "Ocp-Apim-Subscription-Key: {subscription key}" `
--data-ascii "{
    ""faceId"": ""INSERT_SOURCE_FACE_ID"",
    ""personId"": ""INSERT_PERSON_ID"",
    ""largePersonGroupId"": ""INSERT_PERSONGROUP_ID""
}"

    The response should give you a boolean verification result along with a confidence value.

Clean up resources

To delete the LargePersonGroup you created in this exercise, run the LargePersonGroup - Delete call.

curl.exe -v -X DELETE "https://{resource endpoint}/face/v1.0/largepersongroups/{largePersonGroupId}" -H "Ocp-Apim-Subscription-Key: {subscription key}"

If you want to clean up and remove an Azure AI services subscription, you can delete the resource or resource group. Deleting the resource group also deletes any other resources associated with it.

Next steps

In this quickstart, you learned how to use the Face REST API to do basic facial recognition tasks. Next, learn about the different face detection models and how to specify the right model for your use case.

Specify a face detection model version