How to find centroid of image and crop image in several images

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Kong
Kong 2020-3-18
编辑： Kong 2020-3-18
Hello.
I want to convert video to binary image.
And then I want to find center and crop image.
Binay image cropped image
I want to use several images in a folder using for loop. Could I get an idea about this?
Basiclly, I will use this code to convert video to images.
clear all
close all
%// read the video:
reader = VideoReader('shahar_bend.avi');
vid = {};
while hasFrame(reader)
vid{end+1} = im2single(readFrame(reader));
end
%// simple background estimation using mean:
bg = mean( cat(4, vid{:}), 4);
%// estimate foreground as deviation from estimated background:
for i=1:40
fIdx(i) = i; %// do it for frame 1 ~ 60
fg{i} = sum( abs( vid{fIdx(i)} - bg ), 3 );
fg{i} = imresize(fg{i}, 0.3);
fg{i} = reshape(fg{i},[],1);
end
X = cell2mat(fg);
data = double(X);

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采纳的回答

Image Analyst
Image Analyst 2020-3-18
This is EXACTLY what my Image Segmentation Tutorial does.
Find it in my File Exchange.
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Kong
Kong 2020-3-18
编辑：Kong 2020-3-18
How to use image segmentation in video images - MATLAB Answers - MATLAB Central - https://www.mathworks.com/matlabcentral/answers/511399-how-to-use-image-segmentation-in-video-images
I attached here. Thank you so much

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