frames deletion from video

hello, I have 10 frames and I want to delete the similar frames. how can I achieve it with (for loop) on multiple arrays

[Guillaume]

What is a similar frame, mathematically?

[Salim Dada]

like this

I=[0,0,0,0,0;0,0,90,0,0;0,0,90,0,0;90,90,90,0,0;0,0,0,0,0]

k=[0,0,0,0,0;0,0,90,0,0;0,0,90,0,0;90,90,90,0,0;0,0,0,0,0]

Answer 1

[Mark Sherstan]

As a video is just a bunch of pictures and pictures are just matrices you can subtract the two frames (or matrices) to find the differences. How you want to analyze the data or define change (e.g. - is it 5% change or less or more) I will leave up to you. This should put you in the right direction tho:

v = VideoReader('test.mp4');
framePrev = readFrame(v);

% Loop through video frame by frame
while hasFrame(v)
  frameCurrent = readFrame(v);
   
  frameCompare = frameCurrent-framePrev;
  imshow(frameCompare)
  
  framePrev = frameCurrent;
end

[Salim Dada]

thank you a lot, but this work if the two frames was the same matrex? and delete them?

[Mark Sherstan]

I dont understand your question, can you please rephrase or provide an example? You can just store an index counter to track the frames you are happy with. E.g.

if tol < 0.05
    idx(ii) = 1;
else
    idx(ii) = 0;
end

[Salim Dada]

I want to delete the redundant frames to compress the video

[Mark Sherstan]

vIn = VideoReader('videoIn.mp4');
vOut = VideoWriter('videoOut.mp4');

open(vOut)

framePrev = readFrame(vIn);

while hasFrame(vIn)
  frameCurrent = readFrame(vIn);
   
  if (frameCurrent ~= framePrev)
    writeVideo(vOut,frameCurrent)
  end
  
  framePrev = frameCurrent;
end

close(vOut)