frames deletion from video

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Salim Dada 2018-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/436002-frames-deletion-from-video

评论： Mark Sherstan 2018-12-16

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

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Guillaume 2018-12-16

What is a similar frame, mathematically?

Salim Dada 2018-12-16

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]

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回答（1 个）

Mark Sherstan 2018-12-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/436002-frames-deletion-from-video#answer_352648

在 MATLAB Online 中打开

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

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Salim Dada 2018-12-16

I want to delete the redundant frames to compress the video

Mark Sherstan 2018-12-16

在 MATLAB Online 中打开

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)