compare betrween almost identical images

+2 amit baz · July 20, 2014
I would like to know if there is a way to compare if picture A is "equal" to picture B in high probability of success.

"equal" means that if i have a picture, let's call it picture A, and in the picture we can see some sort of an object, and another picture, let's call it B, and in this picture we can see the same object but in different view and in different environment, the algorithm would then say that the images are equal.
We can assume that the object is in the center of the image in both pictures.
what i was thinking for now is somehow find the important pixels and then compare if they are the same, but i don't know what to do know or where i can find more helpful information abut that.


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0 Brandon Elliott · July 20, 2014
I would code something that compares each pixel (assuming the images are the same size) and calculates the percentage that is the same, and if 25% of the pixels are the same, they are the same picture (adjust the 25% to whatever works best)
+1 Mathias Frits Rørvik · July 20, 2014
It is very difficult to comprehend what you are trying to do. Since you're using words like object and equals everywhere. Are you talking about Java object and equals() or something else?

Anyway, compare two images you'll have to compare every single pixel. You're getting yourself into some really complicated algorithms if you want to see if they are equal(ish)
-2 amit baz · July 23, 2014
Mathias Frits Rørvik , i know that already but thanks anyway...but, i wonder if there are libraries or algorithms that can help me to solve this problem or guide me.. in my previous works i used openCV for face recognition and more.. but i couldn't figure out if it can help me in one way or another...  
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