[Insight-users] Initialize optimizer for registration

[Karthik Krishnan]

Hi Laurent,


laurent.paul at club-internet.fr wrote:

>Hi all!
>
>I try to register two volumes.
>I use VersorRigid3DTransform, CenteredVersorTransformInitializer, VersorRigid3DTransformOptimizer, MeanSquaresImageToImageMetric, LinearInterpolateImageFunction and ImageRegistrationMethod.
>My problems are following:
>
>1)I'd want to get the size and spacing of volume to initialize the optimizer as 
>optimizerScales[3] = 1.0 /(10.0 * spacing[0] * size[0] );
>optimizerScales[4] = 1.0 /(10.0 * spacing[1] * size[1] );
>optimizerScales[5] = 1.0 /(10.0 * spacing[2] * size[2] );
>
>  
>
FixedImageSizeType sz = metric->GetFixedImageRegion().GetSize();

>That's the way you adviced in a previous message on mailing list.
>I manage to get the sapcing with the GetSpacing() method, but there's no the equivalent GetSize() method (except in the class ImageRegion).
>Have I use the ImageRegion class to get the size of my volume?
>
>2)Which image spacing and size have I to get? I think it should be the fixed image but I'm not sure. Can you light me?
>
>  
>
Yes, it is the fixed image size and spacing. (although its not a 
suggested scale and not a hard and fast rule. You might have to play 
with it)

>Thank you!
>
>Laurent.
>
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>  
>