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keyframe_extractor.m
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keyframe_extractor.m
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%input video path
vid = 'planes';
%specify format
format = '.mp4';
mat = '.mat';
path = strcat(vid,format);
dest = strcat(vid,mat);
%read video
video = VideoReader(path);
nBins = 256;
frame_len = video.NumberOfFrames;
frames(frame_len) = 0;
framesX(frame_len) = 0;
for i = 1 : frame_len
framesX(i) = i/video.FrameRate;
end
for i = 1 : frame_len
frame = read(video, i);
rHist = imhist(frame(:,:,1), nBins);
gHist = imhist(frame(:,:,2), nBins);
bHist = imhist(frame(:,:,3), nBins);
if i ~= frame_len
frame1 = read(video, i+1);
r1Hist = imhist(frame1(:,:,1), nBins);
g1Hist = imhist(frame1(:,:,2), nBins);
b1Hist = imhist(frame1(:,:,3), nBins);
end
frames(i)= sum(abs(rHist-r1Hist) + abs(gHist-g1Hist) + abs(bHist-b1Hist))/3;
clc;
X = ['Process: ', num2str(int64((i/frame_len)*100)), '%'];
disp(X)
end
save(dest,'frames');
plot(framesX,frames)
xlabel('Duration(s)')
ylabel('RGB Rate of Change')