Apace-time silhouettes of Human motion in video

Question

Kong 2020-3-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/510166-apace-time-silhouettes-of-human-motion-in-video

回答： Bhargavi Maganuru 2020-4-29

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Hello.

I want to classify human motion.

Does anyone know how to get space-time silhouettes in Human motion video?

I want to change the original video to images and then make it to CSV file.

I found this code from https://stackoverflow.com/questions/33931290/how-to-extract-foreground-image-in-matlab

How to get several background subtraction images?

%// read the video:
reader = VideoReader('daria_walk.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:
fIdx = 43; %// do it for frame 43
fg = sum( abs( vid{fIdx} - bg ), 3 ) > 0.25;