How to extract frames from a video in MATLAB?
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Anand
am 2 Mär. 2014
Kommentiert: Image Analyst
am 22 Apr. 2019
Hi, I have managed to read the video frames, but how do i extract them?
videoFReader = vision.VideoFileReader('face.avi');
videoPlayer = vision.VideoPlayer;
while ~isDone(videoFReader)
videoFrame = step(videoFReader);
step(videoPlayer, videoFrame);
end
release(videoPlayer);
release(videoFReader);
Any help would be appreciated
Thank you
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Image Analyst
am 2 Mär. 2014
And what is the difference between a "video frame", and a "screen shot"? Please upload an image of each one so we can tell the difference. Do you mean like you want the task bar, parts of MATLAB, the figure toolbar, and any other programs that might happen to be running on your program, as well as parts of your desktop to be captured and saved?
6 Kommentare
Image Analyst
am 6 Mär. 2014
Sorry but it could be a complicated project and I can't afford to spend a lot of time helping you. Your code looks weird. The min is never going to be more than the max so that "if (b>a)" statement is useless - it will always do the imshow() and never ever do the msgbox(). There's no point at all to that code.
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cp sahu
am 30 Apr. 2015
Bearbeitet: cp sahu
am 30 Apr. 2015
%this code can run on newer versions of Matlab for older versions use %mmreader instead of VideoReader
video=VideoReader('d:\dataset\taxi.mpg');
%pass the path of the video file with extension
for k = 1 : 40
%fill in the no of frames the video contains or anything less than that, The
%no of frames in a video can be identified by reading info about the video.
%i.e. the frame rate in fps, multiply it with video length in sec.
this_frame = read(video, k);
a=sprintf('Frame #%d.jpg', k); % store the name of the frame in 'a'.
imwrite(this_frame,a,'jpg'); % store the extracted frame under the compression scheme with third parameter.
end
2 Kommentare
Anirban Kundu
am 22 Apr. 2019
the imwrite function is not working. It says that "Unable to open file "Frame #1.jpg" for writing. You might not have write permission." I am using Matlab 2018a. Please provide me a solution
Image Analyst
am 22 Apr. 2019
What is the folder you're writing to? It's not under Program Files is it, because Windows does not allow you to write there.
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