video frame saving in running loop

Question

Muhammad 2023-1-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1889947-video-frame-saving-in-running-loop

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

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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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Answer 1

Image Analyst 2023-1-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1889947-video-frame-saving-in-running-loop#answer_1144002

ExtractMovieFrames.m

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.