frames deletion from video

2018 12 16
1 个回答
更新时间：2018 12 16
4 次查看（30 天）

0 个投票

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
Guillaume 2018-12-16
What is a similar frame, mathematically?
Salim Dada
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
Mark Sherstan 2018-12-16

0 个投票

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
Salim Dada 2018-12-16
thank you a lot, but this work if the two frames was the same matrex? and delete them?
Mark Sherstan
Mark Sherstan 2018-12-16
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
Salim Dada 2018-12-16
I want to delete the redundant frames to compress the video
Mark Sherstan
Mark Sherstan 2018-12-16
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)

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