how to retrieve pixel values from bounding box of an image.

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sami ullah
sami ullah 2020-11-4
评论： Ameer Hamza 2020-11-5
Following is a code to create a bounding box of the detected face.
clear all
clc
faceDetector = vision.CascadeObjectDetector;
I = imread('visionteam.jpg'); % RGB IMage
figure
imshow(I)
title('Input Image')
bboxes = step(faceDetector, I);
IFaces = insertObjectAnnotation(I, 'Rectangle', bboxes, 'Face');
figure, imshow(IFaces), title('Detected faces');
--------------------------------------------------------------------
My question is:
How can I obtain pixel values inside this bounding box area?
Store the retrieved values in M by N by 3 matrix, after obtaining the pixel values under the bounding box area. How can it be done?

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Ameer Hamza
Ameer Hamza 2020-11-4
编辑：Ameer Hamza 2020-11-4
See imcrop(): https://www.mathworks.com/help/images/ref/imcrop.html. For example, add following lines at end of your code
faces = cell(1, size(bboxes,1));
for i=1:numel(faces)
faces{i} = imcrop(I, bboxes(i,:));
end
It will save each face in the cell array.
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