Could anyone tell me how can I check if a face was detected in an image?

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geo i 2016-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/273021-could-anyone-tell-me-how-can-i-check-if-a-face-was-detected-in-an-image

评论： ABDELKARIM MELIKI 2019-4-18

 faceDetector = vision.CascadeObjectDetector();
 videoFileReader = vision.VideoFileReader('visionface.avi');
 videoFrame      = step(videoFileReader);
 bbox            = step(faceDetector, videoFrame);
 videoOut = insertObjectAnnotation(videoFrame,'rectangle',bbox,'Face');
 figure, imshow(videoOut), title('Detected face');

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geo i 2016-3-16

Thank you very much. I resolved the problem.

ABDELKARIM MELIKI 2019-4-18

在 MATLAB Online 中打开

would you please tell me how did you resolved the problem ?

my code is like this:

first i did the same steps as you did above.
i added, when i place a bbox around the face i save it into a directory in my laptop (cuz I need it later) with :

FacCrop=imcrop(videoFrame,bbox);
imwrite(FacCrop, fpath); %fpath is already specified

, but since there's some frames where the face can't be detected, that means no face has been detected, and no bbox, so it returns an error in the imcrop function and won't finnish the rest of the video !

So what i want, is first to verify if the face has been detected or not in bbox, to call the crop function, else, skipp the crop step.

I hope you get my problem, and I hope I find a solution from you guys.

Thanks in advance.

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