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how can i crop the faces from the group photos?

asked 2017-10-10 04:22:37 -0600

usuf gravatar image

updated 2017-10-10 04:40:05 -0600

berak gravatar image

Mat img_scene = imread(argv[2], IMREAD_GRAYSCALE);

by using this i can get the photo but how can i crop the each and every faces from this photo?

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answered 2017-10-11 06:48:44 -0600

updated 2017-10-11 06:49:17 -0600

Actually if you want to crop faces you will first have to execute a face detector and then store each and every found detection in a vector of Mat elements. Below is a code sample that will do what you look for:

Mat img_scene = imread(argv[2], IMREAD_GRAYSCALE);
CascadeClassifier detector("/data/LBP_frontalface.xml");
Mat temp;
vector<Rect> detections;
equalizeHist(img_scene, temp);
detector.detectMultiScale(temp, detections, 1.1, 3);

vector<Mat> all_faces;
for(size_t i=0; i < detections.size(); i++){
   Mat croppedFace = img_scene(detections[i]).clone();
   all_faces.push_back(croppedFace);
}
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thanks...for the reply...i did that like ur way

usuf gravatar imageusuf ( 2017-10-16 01:16:13 -0600 )edit
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answered 2017-10-10 07:44:22 -0600

supra56 gravatar image
Mat img_scene = imread(argv[2], IMREAD_GRAYSCALE);
namedWindow("image", CV_WINDOW_FREERATIO);
imshow("image", img_scene);
waitKey(0);

Rect croppedRectangle = Rect(181, 225, 400, 50);
Mat CroppedImage = img_scene(croppedRectangle);

namedWindow("Cropped", CV_WINDOW_FREERATIO);
imshow("Cropped", CroppedImage);
waitKey(0);
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This will only work if you already know the locations of the faces beforehand. Else you will need to look for them first.

StevenPuttemans gravatar imageStevenPuttemans ( 2017-10-11 06:50:06 -0600 )edit

thanks....

usuf gravatar imageusuf ( 2017-10-16 01:17:08 -0600 )edit
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Asked: 2017-10-10 04:22:37 -0600

Seen: 78 times

Last updated: Oct 11