How to add two images and remove the added image

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goldensona 2013-1-27

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is it possible to add two image and did after some operation separate added image from it ?

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Image Analyst 2013-1-27

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Yes.

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goldensona 2013-2-1

we couldnt identify the modified region

Image Analyst 2013-2-1

Then either your method of attack was very stealthy and effective, or your method of detecting attacks was unable to beat this method of attack. Do you have any further questions on the original question in this post? If not, go ahead and finish it by marking an accepted answer.

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Jan 2013-1-28

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在 MATLAB Online 中打开

What does "adding" mean here? Do you want to add the pixel values, if so, does this mean averaging or a sum with ignoring the saturation? Or does adding mean a horizontal or vertically concatenation?

Then the meaning of "some operations" is important also: If you perform any destructive operations, you loose information and therefore a perfect reconstruction of the original data is impossible.

Therefore, in opposite to Image Analyst, I would answer:

No, not in general.

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goldensona 2013-1-28

adding means ,combine two images ,i want to change one images and combine with another images show like one image, if i want the untouched image is it possible to retrieve after combining

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ram 2013-3-1

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it is similar kind of tampering. am i right?

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ram 2013-3-1

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if i cut the portion of one image and paste it in to another image and save as jpg. now i want to separate portion fromthe resultant image. is that possible?

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Walter Roberson 2013-3-1

Similar to what?

Image Analyst 2013-3-1

It might be, depending on exactly what you did. A simple copy and paste would be detectable with normxcorr2() as long as you know what the pasted portion was - look for my demo on that in the Answers forum. But if you took just one or two pixels from an image and pasted it onto another one, then how do you know if it was pasted, or if the original image had those same pixels prior to pasting?

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