Creating movie from Images from a for loop

Question

Robert Roy 2015-5-29

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/220992-creating-movie-from-images-from-a-for-loop

评论： Marcus Lehr 2018-8-24

Hi there, I am currently producing images from a for loop, however I would like put these images into a movie or slideshow,however I am struggling to do this. Any help would be appreciated.

if true
  % code
end
for i=t:Images  
  figure(i)
B=readimx(fullfile(filename,['B000',int2str(i),'.im7']));  
C=B.Frames{1}.Components{1};      
V = C.Planes;
I2=V{1,1};                  
Array3D(:,:,i-t+1)=I2;
K=imagesc(flipud(Array3D(:,:,i-t+1)));  
set(gca,'YDir','normal'); 
end

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Answer 1

Oliver Woodford 2015-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/220992-creating-movie-from-images-from-a-for-loop#answer_180953

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Produce your images programmatically, rather than by exporting a figure, if you can, as it will be much faster. SC (on the FEX) is good for this. Editing Joseph Cheng's code, you would do the following:

 [y, x] = ndgrid(1:256);
 vidfile = VideoWriter('testmovie.mp4','MPEG-4');
 open(vidfile);
 for ind = 1:256
    z = sin(x*2*pi/ind)+cos(y*2*pi/ind);
    im = sc(z, 'hot');
    writeVideo(vidfile, im);
 end
close(vidfile)

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Marcus Lehr 2018-8-24

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Hi Oliver,

I'm trying to use this method however the video file I'm trying to make is of contour plots. writeVideo() gives me the following error:

IMG must be of one of the following classes: double, single, uint8

I've tried converting the data with C2xyz and saving it with SC but it hasn't helped. sc() returns

Conversion to double from cell is not possible.

Any idea how I can convert data created by contour() into a normal image file that I can write? The only workaround I've so far is saving each plot with saveas(), then converting the resulting image files to a stack with imagej. Any better solutions would be appreciated.

Thanks

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Answer 2

Joseph Cheng 2015-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/220992-creating-movie-from-images-from-a-for-loop#answer_180947

编辑：Joseph Cheng 2015-5-29

在 MATLAB Online 中打开

you can follow the example of getframe() in the documentation located here:

http://www.mathworks.com/help/matlab/ref/getframe.html

example:

x=1:256;
[x y] = meshgrid(x,x);
figure(1)
vidfile = VideoWriter('testmovie.mp4','MPEG-4');
open(vidfile);
for ind = 1:256
    z=sin(x*2*pi/ind)+cos(y*2*pi/ind);
   imagesc(z),colormap(hot) 
    drawnow
    F(ind) = getframe(gcf); 
    writeVideo(vidfile,F(ind));
end
close(vidfile)