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Thread: Compare two picture , is picture similar?



Permlink Replies: 1 - Last Post: Sep 28, 2014 5:34 AM Last Post By: Alex Belo Threads: [ Previous | Next ]
Liste Listeler

Posts: 49
Registered: 7/26/07
Compare two picture , is picture similar?
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  Posted: Sep 27, 2014 2:45 PM
How can I compare two picture?
What is the best way? Useing histogram or sum pixels?
Alex Belo

Posts: 626
Registered: 10/8/06
Re: Compare two picture , is picture similar?
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  Posted: Sep 28, 2014 5:34 AM   in response to: Liste Listeler in response to: Liste Listeler
Liste Listeler wrote:

How can I compare two picture?
What is the best way? Useing histogram or sum pixels?

Depends on goal of comparison:

- difference in brightness only? in colors?
- difference in scale (similarity), affine transformation?
- difference in morphed objects?
- difference in some moved object(s)?
- difference in presence/absence of some object(s)?

In other words you need to define what is difference in your case and
invent algorithm to calculate "distance" between pictures. If this
distance is smaller some threshold images are "similar".

Google for "image compare algorithm" and you'll find some clues (on
scackoverflow for example).

--
Alex
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