Face Detection in rotate images

Question

Hi,
i'm trying to use 2 services of the face Api:

• Face Detection
• Face Verification

In a test I have noted that no face are detected if the face image is rotated of 90°.
Do I need to rotate to myself the image in the correct position before the analysis of the Face Cognitive Service?

Thanks
Pierluigi

Answer 1

Hello,

Yes, you need. When you know the direction of the face, you can rotate the rectangular face frame to align it more properly. To crop faces in an image, you can programmatically rotate the image so that the faces always appear upright. More details please refer to the document to address the landmark.

How to detect head posture: https://learn.microsoft.com/en-us/azure/cognitive-services/face/face-api-how-to-topics/how-to-use-headpose#explore-the-sample-code

https://learn.microsoft.com/en-us/azure/cognitive-services/face/face-api-how-to-topics/howtodetectfacesinimage#get-face-landmarks

Regards,
Yutong