How do i separate a video into frames without displaying all the frames in different figures?

Question

I have a code that takes a video and separate it into frames.I would like to NOT keep all the frames, instead i want each frame to be displayed in the previous figure. The code looks like these:

 filename = uigetfile; %get the file name
obj = VideoReader(filename);
nFrames=obj.NumberOfFrames;
 for k = 1 : nFrames  
this_frame = read(obj, k);
thisfig = figure();
thisax = axes('Parent', thisfig);
image(this_frame, 'Parent', thisax);
title(thisax, sprintf('Frame #%d', k));

Another thing that's important is that i calculate intensities from each figure as it comes but i don't need to save the figure after i save the data. Can anyone help me and tell me what i should change in my code? Thanks!

I don't understand you,sorry. Can you explain me what do you mean? — Maayan, Sep 11 '13 at 08:24
I think he is just trying to show all images sequentially without opening a new figure each time. — Dennis Jaheruddin, Sep 11 '13 at 08:25
I have a video for example of 165 frames, every time i run my code i get 165 different figures with all the 165 frames. I would like that each frame will run over the previous frame. — Maayan, Sep 11 '13 at 08:26
Not side by side. At the end i want to have 1 figure with the title of which number of frame it is and it will display only the last frame. — Maayan, Sep 11 '13 at 08:27

score 1 · Accepted Answer · edited May 23 '17 at 11:50

1

Not sure whether it is a full solution, but one improvement in your code would definately be to move the figure() command out of the loop.

Maybe this is already sufficient, or maybe you need to assign your image command to a handle as described in this related question , allowing you to remove the last plotted image before you plot a new one.

edited May 23 '17 at 11:50

Community

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answered Sep 11 '13 at 08:31

Dennis Jaheruddin

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When i take it outside of the loop i get only one figure at the end but it's not the last one and the title and the numbers on the axes are blurry. – Maayan Sep 11 '13 at 08:38
@Maayan Thanks for accepting my answer. However, to help future visitors even more, I would like to ask you to post the final solution that you have found. – Dennis Jaheruddin Sep 11 '13 at 08:58

score 1 · Answer 2 · answered Sep 11 '13 at 09:33

    filename = uigetfile; %get the file name
    obj = VideoReader(filename);
    nFrames=obj.NumberOfFrames;
    thisfig = figure();
 for k = 1 : nFrames  
    this_frame = read(obj, k);
    thisax = axes('Parent', thisfig);
    image(this_frame, 'Parent', thisax);
    if k==nFrames
    title(thisax, sprintf('Frame #%d', k));
    end
end

How do i separate a video into frames without displaying all the frames in different figures?

2 Answers2