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

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.

Answer 1

[Image Analyst]

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.

[Omar Ahmad]

I tried to figure out the subtraction from a series of images from the above link. but I couldn't make it. It would be much pleasing if you give the answer with relation to my question.

The code sample in the FAQ is also seemingly complex for me. Please consider.

thanks

[Omar Ahmad]

Any updates?? Please help

[Image Analyst]

Omar, I'd like to help but when I saw that the FAQ was above the threshold of complexity for you (even though it's only slightly more complicated than your for loop), I didn't really know what to do. Now that you've had a few days to study the FAQ, do you think that if I make a slight adaption inside the for loop to subtract the prior image from the current image that you'll be able to follow it? It's not much more than sticking diffImage = double(currentImage) - double(priorImage) into the for loop but I can do it for you if you want.

[Omar Ahmad]

yes please.. but please make it as simple as possible

[Omar Ahmad]

Sir, have you come up with a solution to my problem?

Please help.

[Image Analyst]

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]

Thank you very much Sir. Have a safe journey ahead. Thanks for everything again..