Azure Computer Vision Resource not found when called using the SDK or accessed via the browser.

Question

Azure Computer Vision Resource not found when called using the SDK or accessed via the browser.

Javi Guarin 40

I created an Azure Computer Vision resource to explore its features. I'll be using it inside a mobile app and make use of the ImageAnalysis SDK: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis/1.0.0-beta.3.

After I created the resource, I noticed the SDK throws me an error saying: "(hostname nor servname provided, or not known (<vision-resource-name>.cognitiveservices.azure.com:443))".

I noticed that when I try to access the url directly from the browser it shows a json message:

{

"error": {

    "code": "404",

    "message": "Resource not found"

}

}

is there anything else that needs to be setup when creating an (Azure) Computer Vision resource?

how can I use it in the ImageAnalysis SDK?

navba-MSFT 27,550 Microsoft Employee Moderator

@Javi Guarin Welcome to Microsoft Q&A Forum, Thank you for posting your query here! .

.

Firstly, directly testing / browsing the endpoint URL from browser is not a valid test.

.

Ensure that the endpoint and the keys are entered correctly in your code. I used the same sample from the article, and it worked fine. I got a 200 success status code.

.

I am pasting my sample code here for your reference:

.

Image Analysis Caption


 string endpoint = "https://MyVisionName.cognitiveservices.azure.com/";
 string key = "337e4XXXXXXXXXXXX633cd7f";

 // Create an Image Analysis client.
 ImageAnalysisClient client = new ImageAnalysisClient(new Uri(endpoint), new AzureKeyCredential(key));

 // Use a file stream to pass the image data to the analyze call
 FileStream stream = new FileStream("image-analysis-sample.jpg", FileMode.Open);

 // Get a caption for the image.
 ImageAnalysisResult result = client.Analyze(
     BinaryData.FromStream(stream),
     VisualFeatures.Caption,
     new ImageAnalysisOptions { GenderNeutralCaption = true });

 // Print caption results to the console
 Console.WriteLine($"Image analysis results:");
 Console.WriteLine($" Caption:");
 Console.WriteLine($"   '{result.Caption.Text}', Confidence {result.Caption.Confidence:F4}");

Extracting text from image uploaded

 string endpoint = "https://MyVisionName.cognitiveservices.azure.com/";
 string key = "337e4XXXXXXXXXXXX633cd7f";

 // Create an Image Analysis client.
 ImageAnalysisClient client = new ImageAnalysisClient(new Uri(endpoint), new AzureKeyCredential(key));

      FileStream stream = new FileStream("image-analysis-sample1.jpg", FileMode.Open);

      // Extract text (OCR) from an image stream.
      ImageAnalysisResult result = client.Analyze(
          BinaryData.FromStream(stream),
          VisualFeatures.Read);

      // Print text (OCR) analysis results to the console
      Console.WriteLine("Image analysis results:");
      Console.WriteLine(" Read:");

      foreach (DetectedTextBlock block in result.Read.Blocks)
          foreach (DetectedTextLine line in block.Lines)
          {
              Console.WriteLine($"   Line: '{line.Text}', Bounding Polygon: [{string.Join(" ", line.BoundingPolygon)}]");
              foreach (DetectedTextWord word in line.Words)
              {
                  Console.WriteLine($"     Word: '{word.Text}', Confidence {word.Confidence.ToString("#.####")}, Bounding Polygon: [{string.Join(" ", word.BoundingPolygon)}]");
              }
          }
      Console.ReadLine();
  }

Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.

navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-16T07:44:42.1733333+00:00

@Javi Guarin Just following up to check if my suggestion helped. Please let me know if you have any further queries. I would be happy to help.
Javi Guarin 40 Reputation points

2024-08-20T04:54:41.1033333+00:00

hi Navba, sorry for the late response. I was under the impression the Computer Vision requires an additional resource running before it would work. Additionally the emulator that I used didn't have a proper internet connection, apologies for that user error.

I could now connect to the resource without issues except that I keep getting 400 bad request response.
navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-20T05:35:12.11+00:00
@Javi Guarin Thanks for getting back.

.

Questions:

Could you please share your use case?

What feature of Computer Vision are you using? Is it to extract text from image? Get a caption? Identify image etc ?

Did you use my above sample code ?

If not, Please share your sample code here.

Also share the detailed error message of the HTTP 400 error.

Awaiting your reply.
Javi Guarin 40 Reputation points

2024-08-20T08:55:40.79+00:00

I'm using computer vision to extract text from an image. I used the sample code based of the nuget C# sdk: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis.

The error message I'm getting says: "The image size is not allowed to be zero or larger than 20971520 bytes". although I can confirm an image is generated I'm looking whether there's a way to see in the azure resource if what kind of request was received by the computer vision resource.
Javi Guarin 40 Reputation points

2024-08-20T09:01:05.8733333+00:00

I'm using computer vision to extract text from an image. I've used the sample code attached on the C# SDK: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis
I did however had to add other changes on top as the image would come from Android's Image Analyzer.

When I pass the image to the SDK's ImageAnalysisClient.Analyze I always get an error: The image size is not allowed to be zero or larger than 20971520 bytes.
navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-20T09:50:48.1066667+00:00
@Javi Guarin Thanks for your reply.

The service is throwing an error because my image file is too large. How can I work around this?

The file size limit for most Azure AI Vision features is 4 MB for the 3.2 version of the API and 20MB for the 4.0 version, and the client library SDKs can handle files up to 6 MB. For more information, see the Image Analysis input limits.

.

If you want to preview the image before sending it to Azure Computer Vision to ensure it meets all the requirements. Here are a few steps you can follow:

Convert ImageProxy to Bitmap: First, convert the ImageProxy from CameraX to a Bitmap.

Display the Bitmap: Use an ImageView in your Android app to display the Bitmap.

Here’s a sample code snippet to help you with this:

// Convert ImageProxy to Bitmap private Bitmap ImageProxyToBitmap(ImageProxy image) { var planes = image.GetPlanes(); var buffer = planes[0].Buffer; byte[] bytes = new byte[buffer.Remaining()]; buffer.Get(bytes); return BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length); } // Display the Bitmap in an ImageView private void DisplayImage(Bitmap bitmap) { ImageView imageView = FindViewById<ImageView>(Resource.Id.imageView); imageView.SetImageBitmap(bitmap); } // Usage in ImageAnalysis.Analyzer public void Analyze(ImageProxy image) { Bitmap bitmap = ImageProxyToBitmap(image); DisplayImage(bitmap); // Further processing... image.Close(); }

This code will help you convert the ImageProxy to a Bitmap and display it in an ImageView for preview before sending it to Azure Computer Vision.
Javi Guarin 40 Reputation points

2024-08-20T15:29:14.2533333+00:00

What if I want to pass the image from image proxy?

navba-MSFT 27,550 Microsoft Employee Moderator

@Javi Guarin If you want to pass the image directly from ImageProxy to Azure Computer Vision, you’ll need to convert the ImageProxy to a format that Azure Computer Vision can accept, such as a byte array. Here’s how you can do it:

Convert ImageProxy to Byte Array: Extract the image data from ImageProxy and convert it to a byte array.
Send Byte Array to Azure Computer Vision: Use the Azure SDK to send the byte array to the Computer Vision API.

Here is the sample code:

// Convert ImageProxy to Byte Array

private byte[] ImageProxyToByteArray(ImageProxy image)

{

    var planes = image.GetPlanes();

    var buffer = planes.Buffer;

    byte[] bytes = new byte[buffer.Remaining()];

    buffer.Get(bytes);

    return bytes;

}

// Send Byte Array to Azure Computer Vision

private async Task AnalyzeImageAsync(byte[] imageBytes)

{

    var client = new ComputerVisionClient(new ApiKeyServiceClientCredentials("YOUR_API_KEY"))

    {

        Endpoint = "YOUR_ENDPOINT"

    };

    using (var stream = new MemoryStream(imageBytes))

    {

        var features = new List<VisualFeatureTypes?> { VisualFeatureTypes.Description };

        var analysis = await client.AnalyzeImageInStreamAsync(stream, features);

        // Process the analysis results

    }

}

// Usage in ImageAnalysis.Analyzer

public async void Analyze(ImageProxy image)

{

    byte[] imageBytes = ImageProxyToByteArray(image);

    await AnalyzeImageAsync(imageBytes);

    image.Close();

}

Hope this answers.

navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-22T07:25:40.1766667+00:00

@Javi Guarin Just following up to check if my suggestion helped. Please let me know if you have any further queries. I would be happy to help.

Your answer

navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-16T07:44:42.1733333+00:00

@Javi Guarin Just following up to check if my suggestion helped. Please let me know if you have any further queries. I would be happy to help.
Javi Guarin 40 Reputation points

2024-08-20T04:54:41.1033333+00:00

hi Navba, sorry for the late response. I was under the impression the Computer Vision requires an additional resource running before it would work. Additionally the emulator that I used didn't have a proper internet connection, apologies for that user error.

I could now connect to the resource without issues except that I keep getting 400 bad request response.
navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-20T05:35:12.11+00:00

@Javi Guarin Thanks for getting back.

.

Questions:

Could you please share your use case?

What feature of Computer Vision are you using? Is it to extract text from image? Get a caption? Identify image etc ?

Did you use my above sample code ?

If not, Please share your sample code here.

Also share the detailed error message of the HTTP 400 error.

Awaiting your reply.
Javi Guarin 40 Reputation points

2024-08-20T08:55:40.79+00:00

I'm using computer vision to extract text from an image. I used the sample code based of the nuget C# sdk: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis.

The error message I'm getting says: "The image size is not allowed to be zero or larger than 20971520 bytes". although I can confirm an image is generated I'm looking whether there's a way to see in the azure resource if what kind of request was received by the computer vision resource.
Javi Guarin 40 Reputation points

2024-08-20T09:01:05.8733333+00:00

I'm using computer vision to extract text from an image. I've used the sample code attached on the C# SDK: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis
I did however had to add other changes on top as the image would come from Android's Image Analyzer.

When I pass the image to the SDK's ImageAnalysisClient.Analyze I always get an error: The image size is not allowed to be zero or larger than 20971520 bytes.
navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-20T09:50:48.1066667+00:00

@Javi Guarin Thanks for your reply.

The service is throwing an error because my image file is too large. How can I work around this?

The file size limit for most Azure AI Vision features is 4 MB for the 3.2 version of the API and 20MB for the 4.0 version, and the client library SDKs can handle files up to 6 MB. For more information, see the Image Analysis input limits.

.

If you want to preview the image before sending it to Azure Computer Vision to ensure it meets all the requirements. Here are a few steps you can follow:

Convert ImageProxy to Bitmap: First, convert the ImageProxy from CameraX to a Bitmap.

Display the Bitmap: Use an ImageView in your Android app to display the Bitmap.

Here’s a sample code snippet to help you with this:

// Convert ImageProxy to Bitmap private Bitmap ImageProxyToBitmap(ImageProxy image) { var planes = image.GetPlanes(); var buffer = planes[0].Buffer; byte[] bytes = new byte[buffer.Remaining()]; buffer.Get(bytes); return BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length); } // Display the Bitmap in an ImageView private void DisplayImage(Bitmap bitmap) { ImageView imageView = FindViewById<ImageView>(Resource.Id.imageView); imageView.SetImageBitmap(bitmap); } // Usage in ImageAnalysis.Analyzer public void Analyze(ImageProxy image) { Bitmap bitmap = ImageProxyToBitmap(image); DisplayImage(bitmap); // Further processing... image.Close(); }

This code will help you convert the ImageProxy to a Bitmap and display it in an ImageView for preview before sending it to Azure Computer Vision.
Javi Guarin 40 Reputation points

2024-08-20T15:29:14.2533333+00:00

What if I want to pass the image from image proxy?
navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-21T06:33:39.69+00:00

@Javi Guarin If you want to pass the image directly from ImageProxy to Azure Computer Vision, you’ll need to convert the ImageProxy to a format that Azure Computer Vision can accept, such as a byte array. Here’s how you can do it:

Convert ImageProxy to Byte Array: Extract the image data from ImageProxy and convert it to a byte array.

Send Byte Array to Azure Computer Vision: Use the Azure SDK to send the byte array to the Computer Vision API.

Here is the sample code:

// Convert ImageProxy to Byte Array private byte[] ImageProxyToByteArray(ImageProxy image) { var planes = image.GetPlanes(); var buffer = planes.Buffer; byte[] bytes = new byte[buffer.Remaining()]; buffer.Get(bytes); return bytes; } // Send Byte Array to Azure Computer Vision private async Task AnalyzeImageAsync(byte[] imageBytes) { var client = new ComputerVisionClient(new ApiKeyServiceClientCredentials("YOUR_API_KEY")) { Endpoint = "YOUR_ENDPOINT" }; using (var stream = new MemoryStream(imageBytes)) { var features = new List<VisualFeatureTypes?> { VisualFeatureTypes.Description }; var analysis = await client.AnalyzeImageInStreamAsync(stream, features); // Process the analysis results } } // Usage in ImageAnalysis.Analyzer public async void Analyze(ImageProxy image) { byte[] imageBytes = ImageProxyToByteArray(image); await AnalyzeImageAsync(imageBytes); image.Close(); }

Hope this answers.
navba-MSFT 27,550 Reputation points Microsoft Employee Moderator

2024-08-22T07:25:40.1766667+00:00

@Javi Guarin Just following up to check if my suggestion helped. Please let me know if you have any further queries. I would be happy to help.

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Azure Computer Vision Resource not found when called using the SDK or accessed via the browser.

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