how to take the difference of images (at once) within multiple snapshots ?

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Omar Ahmad 2014-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/164957-how-to-take-the-difference-of-images-at-once-within-multiple-snapshots

评论： Omar Ahmad 2014-12-17

采纳的回答： Image Analyst

在 MATLAB Online 中打开

My present situation:

for i=1:10 
  grayImage = getsnapshot (cam);
  grayImage = rgb2gray (grayImage);
  imwrite (grayImage,sprintf('test_%d.jpg',i));
end

I want to see the image differences being subtracted automatically (e.g. from image 1 and 2, 3 and 4, 5 and 6 etc.) without doing it one by one like the following.

f1=imread ('test_1.jpg'); 
f2=imread ('test_2.jpg');
diffGray = abs (f1-f2);

And after having coded to do the operation automatically, I also want to save the differences into a folder in Binary format (to make it visible in black and white). The saving must also take place automatically rather having to use imwrite for saving each and every difference.

Please help. thank you very much.

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采纳的回答

Image Analyst 2014-12-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/164957-how-to-take-the-difference-of-images-at-once-within-multiple-snapshots#answer_160815

You will find it easy to adapt one of the code samples in the FAQ to subtract the (n-1)st image from the nth image. http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F Let me know if you can't.

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Image Analyst 2014-12-16

ExtractMovieFrames.m

See my attached demo where I get differences between frames of a video.

By the way I'll be traveling in Arizona and California from this evening through Friday so I most likely won't be able to answer anyone at all during that time.

Omar Ahmad 2014-12-17