Re: [Boost-users] Does anyone know how to detect image offset?

Subject: Re: [Boost-users] Does anyone know how to detect image offset?
From: Peter (p.schregle_at_[hidden])
Date: 2009-06-08 02:33:40

You need image processing and analysis functions for that, specifically 
pattern recognition. GIL lacks these functions, in that sense it's a body 
without arms and legs.

Have a look at www.ngi-central.org. The search sample explains how to search 
for patterns in images, and from this you can calculate the offset. Once you 
have the offset there are other algorithms which can give you a degree of 
similarity of your images.

Peter

"blp330" <blp330_at_[hidden]> schrieb im Newsbeitrag 
news:23913312.post_at_talk.nabble.com...
>
> Hi,
>
> I have two images:
>
> http://mercurius.f-snet.com/offset1.png
> http://mercurius.f-snet.com/offset1.png
> http://mercurius.f-snet.com/offset2.png
> http://mercurius.f-snet.com/offset2.png
>
> They are the same in visually by eyes, but actually they are different
> because of margin.
>
> Does anyone know any algorithm or way to compare these two images but
> ignores the offset of images?
> (I mean, offset2.png can be treated like offset1.png + n pixels offset, it
> only moved, not changed.)
>
> If I do boost::gil::equal_pixels(offset1, offset2), I will get false 
> because
> they are different.
> I need a way to compare offset1.png and offset2.png with moving detection.
>
> Any suggestion is welcome!
>
> Thanks.
> -- 
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>