Image comparing algorithm

Thilantdm asked:

friends i need some help for find some kind of good algorim for image comparing.
system is like this
1) i upload image to my web site
2) our database has 10 no of similar pictures
but we store those images as edges view.
(please check following link
Canny Edge Detection in C#[^]

in this link (4th)strong edges is my storing images type of database.

3)after i upload my image to the web site, it will do some process and convert this image to the (4th)strong edges image.(please check above link.other wise you cannot understand)

4)now using some algorithm compare database images and our browsed image and give name of it

i need help here.what is the best way to compare this image??
is there any kind of algorithms for that?

Tags: C#

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