MATLAB: Convert images to video

image processing

can anyone sugest how to convert images to video using matlab

Best Answer

In the help to addframe, you find an example of that: http://www.mathworks.com/help/matlab/ref/avifile.addframe.html

aviobj = avifile('example.avi','compression','None');
t = linspace(0,2.5*pi,40);
fact = 10*sin(t);
fig=figure;
[x,y,z] = peaks;
for k=1:length(fact)
  h = surf(x,y,fact(k)*z);
  axis([-3 3 -3 3 -80 80])
  axis off
  caxis([-90 90])
  F = getframe(fig);
  aviobj = addframe(aviobj,F);
end
close(fig);
aviobj = close(aviobj);

Instead of creating a surface plot, you can also display an image (imshow).

Related Solutions

MATLAB: How to make a video of a graph with axes and axes labels

I found out how to solve it. The line frame = getframe; is changed to frame = getframe(gcf);

close all; clear all;
writerObj = VideoWriter('peaks.avi');
writerObj.FrameRate = 5;
open(writerObj);
Z = peaks; surf(Z); 
axis tight
set(gca,'nextplot','replacechildren');
set(gcf,'Renderer','zbuffer');
xlabel('x label')
ylabel('y label')
zlabel('z label')
for k = 1:20 
   surf(sin(2*pi*k/20)*Z,Z)
   frame = getframe(gcf);
   writeVideo(writerObj,frame);
end
close(writerObj);
winopen('peaks.avi')

MATLAB: How to play movies at a size different from the original using the MOVIE function within MATLAB

The ability to play an AVI-file of a specified size using the MOVIE function is not available in MATLAB.

To work around this issue, try resizing your AVI-file before using the MOVIE function. For example:

First, create a sample movie.

t = linspace(0,2*pi,40);
fact = 10*sin(t);
fig=figure;
set(fig,'DoubleBuffer','on');
mov = avifile('example.avi','compression','indeo5','fps',8)
[x,y,z] = peaks;
for k=1:length(fact)
      h = surf(x,y,fact(k)*z);
      axis([-3 3 -3 3 -80 80])
      axis off
      caxis([-90 90])
      F = getframe(gca);
      mov = addframe(mov,F);
end
close(fig)
mov = close(mov);

Second, resize the sample movie.

% read in the movie
mov = aviread('example.avi');
% reduce the movie by 2
factor = 2;
% get dimensions of example.avi
dims = size(mov(1).cdata);
% scale axes, flip ydir for IMAGE, set units to pixels
hf = figure;
ha = axes( ...
      'units','pixels', ...
      'position',[0 0 dims([2 1])./factor], ...
      'nextplot','replacechildren', ...
      'ydir','reverse');
axis(ha,'off');
% create new movie
newmov = avifile('newexample.avi','compression','none');
for i=1:length(mov)
      % display movie frame by frame on resized axis
      image(mov(i).cdata);
      axis(ha,'tight')
      % add frame to new movie
      newmov = addframe(newmov,getframe(ha));
end
% create new movie file
newmov = close(newmov);

Best Answer

Related Solutions

MATLAB: How to make a video of a graph with axes and axes labels

MATLAB: How to play movies at a size different from the original using the MOVIE function within MATLAB

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