im trying to make this code to work as a bacground subtraction for motion detection in matlab but it only reads the first frame and make it grayscale and put up a difference between the same frame. can someone please help me loop it in away that it would go through all the frames thankyou!

v = VideoReader('IMG_6976.m4v'); NumOfFrames = v.NumberOfFrames; vidHeight = v.Height; vidWidth = v.Width; vidResize = zeros(vidHeight, vidWidth);

FirstFrame = read(v,1); bg_bw = rgb2gray(FirstFrame); info = get(v);

for ii = 1:v.NumberOfFrames %fr = read(v, [1 Inf]); fr = read(v, ii); fr_bw = rgb2gray(fr); OptimalThreshold = 25; absdiff = abs(double(fr_bw) - double(bg_bw)); for j=1:vidWidth for k=1:vidHeight if ((absdiff(k,j) > OptimalThreshold)) vidResize(k,j) = fr_bw(k,j); else vidResize(k,j) = 0; end end end

end bg_bw = fr_bw; figure(1),subplot(3,1,1),imshow(fr) subplot(3,1,2),imshow(fr_bw) subplot(3,1,3),imshow(uint8(vidResize))