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Re: correlation between images [message #66004 is a reply to message #65922]

Wed, 08 April 2009 07:20

Mike[2]
Messages: 99
Registered: December 2005

Member

On Apr 8, 4:04 am, Wox <s...@nomail.com> wrote:
> On Mon, 6 Apr 2009 10:12:07 -0700 (PDT), Mike
>
> <Michael.Mill...@gmail.com> wrote:
>> That reminded me that the open source program gqview includes a tool
>> for finding duplicate images based on a similarity measure. Maybe the
>> code would shed some light...
>
> The code can be found in "similar.c"
>
> It seems that both images are subdivided in 32x32 subimages. For each
> subimage the average value is calculated. Then the (normalized) sum of
> differences between the two resulting 32x32 arrays is taken as
> similarity measure.
>
> So this is similar to the RMS approach.
>
> As for the SPMs: it seems I'll have to invest a lot of time to
> understand and implement this. You seem to have doubts about its use
> in my case. Do you think it's worth the effort?

That depends on the details of how what you'd be using it for. The
section on experimental design in www.fil.ion.ucl.ac.uk/spm/doc/intro/
might help you answer that question.

As for implementing it for a single experiment, it's not that hard.
Making a general system would be complicated, but you could use the
(matlab-based (please forgive my heresy)) SPM software.

Mike

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[Message index]

		correlation between images By: Wout De Nolf on Thu, 02 April 2009 05:33
		Re: correlation between images By: Mike[2] on Wed, 08 April 2009 07:20
		Re: correlation between images By: Wout De Nolf on Wed, 08 April 2009 01:04
		Re: correlation between images By: Mike[2] on Mon, 06 April 2009 10:12
		Re: correlation between images By: Mike[2] on Mon, 06 April 2009 09:59
		Re: correlation between images By: David Fanning on Mon, 06 April 2009 08:46
		Re: correlation between images By: Wout De Nolf on Mon, 06 April 2009 08:13
		Re: correlation between images By: Mike[2] on Mon, 06 April 2009 07:35
		Re: correlation between images By: Wout De Nolf on Mon, 06 April 2009 02:56
		Re: correlation between images By: C.E. Ordonez on Fri, 03 April 2009 07:43
		Re: correlation between images By: Wout De Nolf on Fri, 03 April 2009 05:01
		Re: correlation between images By: Wout De Nolf on Fri, 03 April 2009 00:45
		Re: correlation between images By: Brian Larsen on Thu, 02 April 2009 14:02
		Re: correlation between images By: Brian Larsen on Thu, 02 April 2009 13:56
		Re: correlation between images By: Brian Larsen on Thu, 02 April 2009 10:54
		Re: correlation between images By: Wout De Nolf on Thu, 02 April 2009 09:14
		Re: correlation between images By: Brian Larsen on Thu, 02 April 2009 07:45
		Re: correlation between images By: Brian Larsen on Thu, 02 April 2009 07:38

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