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

Subject: Re: [Boost-users] Does anyone know how to detect image offset?
From: Jens Weller (JensWeller_at_[hidden])
Date: 2009-06-07 14:03:28

> 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!

Trim the first lines and rows from both images, which only contain pixels of white/transparent color. But thats surley expensive, as you have to look at a lot of pixels.

regards,

Jens Weller
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