How to calculate Geodesic distance of human motion video in matrix

Question

Kong 2020-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/510341-how-to-calculate-geodesic-distance-of-human-motion-video-in-matrix

回答： Pranjal Kaura 2021-9-28

matrix.csv

I have (144 x 10800) or (25920 x 60) matrix as attached file.

The matrix was made background subtraction in video.

%// read the video:
reader = VideoReader('lena_side.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=1:60
    fIdx(i) = i; %// do it for frame 1 ~ 60
    fg{i} = sum( abs( vid{fIdx(i)} - bg ), 3 ) > 0.25;
    fg{i} = reshape(fg{i},[],1);
end
D1 = cell2mat(fg);

How can I calculate Geodesic distance in matrix? I wanna use the geodesic distance.

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Answer 1

Pranjal Kaura 2021-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/510341-how-to-calculate-geodesic-distance-of-human-motion-video-in-matrix#answer_796744

Hey Kong,

You could use the bwdistgeodesic function to compute the geodesic distance for an image.

"bwdistgeodesic" accepts a binary image as input, so you would have to transform the frames in your video to binary images. You can use rgb2gray and imbinarize functions for this.

Hope this helps!