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

 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');

[Walter Roberson]

I am not certain, but it sounds as if you might be asking for a way to validate that the face detector did indeed find a face? Have you considered checking the size of the bounding boxes returned or the number of bounding boxes returned?

[geo i]

Thank you very much. I resolved the problem.

[ABDELKARIM MELIKI]

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.

Answer 1

[Explorer]

1. Capture your image using webcam

2. Detect skin and convert it into binary image

3. Detected larger blob i.e Face (Smaller one is hand and I detected hand for my project)

4. Process it.

http://www.mathworks.com/matlabcentral/answers/112917-how-to-detect-hand

[geo i]

Thank you very much. It's very helpful for me.