Algorithm to compare two images

Ruby
1

Hi, I would like to know if there is an algorithm to compare two jpg
without using RMagick.

Thanks.

2

Hi,

Well, it certainly depens on that you mean by “comparing”. Maybe this is
helpful:

3

Thanks :slight_smile:

Jan E. wrote in post #1051817:

Hi,

Well, it certainly depens on that you mean by “comparing”. Maybe this is
helpful:

http://rosettacode.org/wiki/Percentage_difference_between_images#Ruby

4

Sorry. I used the Average Hash algorithm on that page.

5

I used

http://www.hackerfactor.com/blog/index.php?/archives/432-Looks-Like-It.html

for comparing mugshots. Its tweak-able an worked well enough. I did
this in jruby and python. I found I had to write my own shrink method
because resizing produces different results even with the same
algorithms.

Becker