video frame saving in running loop

3 次查看（过去 30 天）
Muhammad
Muhammad 2023-1-7
评论： Image Analyst 2023-1-8
actualy i am readig a video and taking its frame one after another in loop, what i wanna know is that how i can use each frame inn imread command as that read from specific path
vidObj = VideoReader('ch.mp4');
i=1;
while hasFrame(vidObj)
vidFrame = readFrame(vidObj);
inframe = imread('');
localcolor = [100 50 0]/255;
% convert to HSV
hsvcolor = rgb2hsv(localcolor);
hsvframe = rgb2hsv(inframe);
% substitute HS
hsvframe(:,:,1) = hsvcolor(1);
hsvframe(:,:,2) = hsvcolor(2);
% convert back to RGB
outframe = hsv2rgb(hsvframe);
imshow(outframe)
pause(1/vidObj.FrameRate);
i=i+1;
end
  1 个评论
Jan
Jan 2023-1-8
There is no need to call imread, because you do not want to imprt an image file. Therefore I'd simply omit this command and work with the alreayd imported frame.

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回答（1 个）

Image Analyst
Image Analyst 2023-1-8
See attached demo. It runs through a video taking the mean R, G, and B values of the image and, optionally, writing each frame out to disk. Then it builds a new video by reading those frames on disk back in and constructing a new video from them.

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