How to crop detected face part?

a=imread('C:\Users\SanaUllah\Documents\MATLAB\face.jpg');
a=imresize(a,1);
subplot(3,3,1);
imshow(a);

detector=vision.CascadeObjectDetector('mouth');
detector.MergeThreshold=60;
boundingbox=step(detector,a);
out=insertObjectAnnotation(a,'rectangle',boundingbox,'mouth Detected','LineWidth',3,'TextColor','black');
subplot(3,3,2);
imshow(out)

[Sana Ullah]

sorry i havent shown the detected mouth picture but

through above programming i have detected the mouth but now i have no idea how to crop the detected mouth.

please someone help me in this .

Answer 1

[Image Analyst]

Try this:

rgbImage = imread('face.jpeg');
rgbImage = imresize(rgbImage,1);
subplot(2, 3, 1);
imshow(rgbImage);
axis('on', 'image');
drawnow;

detector=vision.CascadeObjectDetector('mouth');
detector.MergeThreshold=60;
allBoundingBoxes=step(detector,rgbImage)
out = insertObjectAnnotation(rgbImage,'rectangle',allBoundingBoxes,'mouth Detected','LineWidth',3,'TextColor','black');
subplot(2, 3, 2);
imshow(out)
axis('on', 'image');
% Crop out each bounding box to a new image.
for k = 1 : size(allBoundingBoxes, 1)
	% Crop the image.
	thisBoundingBox = allBoundingBoxes(k, :);
	croppedImage = imcrop(rgbImage, thisBoundingBox);
	% Display it
	subplot(2, 3, k+2);
	imshow(croppedImage)
	axis('on', 'image');
end

[Sana Ullah]

Ohh God this Answer is perfect ?. I have seen many of your answers on other problems. I was just waiting for you to guide me on this problem . Thank you so much Sir.

Answer 2

[KALYAN ACHARJYA]

Please see my this answer, it may help

[Sana Ullah]

thank you sir that was very helpfull.

Answer 3

[Philippe Lebel]

RGB Images are 3D matrices with dimenions = (resolution_x, resolution_y, 3)

I suppose the bounding box contains the face.

Try this:

my_face = a(boundingbox(1):boundingbox(1)+boundingbox(3),boundingbox(2):boundingbox(2)+boundingbox(4), : )