How to calculate Geodesic distance of human motion video in matrix

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Kong
Kong 2020-3-11
回答： Pranjal Kaura 2021-9-28
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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回答（1 个）

Pranjal Kaura
Pranjal Kaura 2021-9-28
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!

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