[Insight-users] Image is blurred after registration

[Xi LIANG]

Hi Mark,
Thank you very much for the webpage you recommended. The moving image and output image are attached with the email (not sure whether the attachment would work here). These two images are not the same 3D slices, but they should be able to give an indicate that the output image is smoother (more blurred) than the moving image.
The output image is generated by using DeformableRegistration8.cxx. I think this blur could be the result of linear interpolation or the regularization term. However, I am not able to point out where and how regularization term is used in this code, and I have posted this question in another email as well.
Regards,

Xi




> Date: Tue, 12 Jan 2010 08:20:07 -0800
> Subject: Re: [Insight-users] Image is blurred after registration
> From: mmroden at gmail.com
> To: liangxi1986317 at hotmail.com
> 
> Hi Xi,
> 
> If you posted small versions of what you mean by 'blurring', then a
> more precise answer could be given.
> 
> In general, any registration requires resampling the data, and that
> resampling will necessarily not be as sharp as the original image.
> That phenomenon is called 'aliasing':
> http://en.wikipedia.org/wiki/Aliasing
> 
> Also, I put an explanation of this on Stack Overflow for someone else
> with a similar question (they weren't using itk, but the principle is
> the same):
> http://stackoverflow.com/questions/1217153/my-rotated-image-doesnt-have-sharp-edges/1217260#1217260
> 
> Hope that helps,
> Mark

 		 	   		  
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