how do i create mirror images of images in .mat format

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sara bokhari 2014-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/125483-how-do-i-create-mirror-images-of-images-in-mat-format

评论： Walter Roberson 2014-4-14

I'm basically trying to make a data set for AAM training, I have landmarked several images( video sequence of a frontal pose to moving the head right) and stored them in a .mat format. So now i want a code that will create the mirror image of the annotated images so that i dun have to repeat the process for frontal pose to head moving left on each image.

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Walter Roberson 2014-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/125483-how-do-i-create-mirror-images-of-images-in-mat-format#answer_133118

fliplr() ?

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sara bokhari 2014-4-14

编辑：Walter Roberson 2014-4-14

在 MATLAB Online 中打开

thanku so much for your help .. but im still getting an error

matfilename = '005.mat';
filedata = load(matfilename);
fn = fieldnames(filedata);
for K = 1 : length(fn)
  thisfield = fn{K};
  if strncmp(thisfield, 'flip_', 5)  %do not re-flip
    continue;
  end
  flip_name = ['flip_' thisfield];
  filedata.(flip_name) = fliplr(filedata.(thisfield));
end
save(matfilename, 'filedata', '-struct');
Error using save
The -STRUCT option must be followed by the name of a scalar structure variable.

Also i need to flip over 500 images and i need both the copies the original and flipped.

Walter Roberson 2014-4-14

在 MATLAB Online 中打开

save(matfilename, '-struct', 'filedata');

The code does save both the original and the flipped versions; the flipped ones are prefixed with the word 'flip_'. The code can be run multiple times on the same .mat file, as it will not overwrite an existing flip_ version of an image.

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