[Insight-users] increasing bspline control point density

[Stefan Klein]

Hi Karl,

You may use the itk::BSplineUpsampleImageFilter.
Look at the help of itk::BSplineUpsampleImageFilterBase. There it's 
explained how it works.

Regards,
Stefan.




At 08:46 23/07/04, Miller, James V (Research) wrote:
>I do not think ITK provides a mechanism for increasing the number of
>control points in a B-spline grid.  However, the mathematics of B-splines
>do support this operation.  There are formulas for adding a control point
>to a B-spline that maintain the trace of the B-spline (shape of the
>B-spline).
>
>Any good book on B-splines will provide the formulas.
>
>Jim
>
>
>
>-----Original Message-----
>From: Karl Baum [mailto:kgbaum at syr.edu]
>Sent: Thursday, July 22, 2004 5:22 PM
>To: insight-users at itk.org
>Subject: [Insight-users] increasing bspline control point density
>
>
>Hi,
>I am using BSplines to provide the transformations necessary for my
>registration.  I would like to take an iterative approach where I first do
>registration with a low control point density, and then use the results as
>input to a registration with a higher control point density.  The issue I am
>facing at this point in time is how to initialize the parameters of the
>second iteration with the results of the first iteration.  In other words I
>need to take the grid defined by the deformation coefficients of the first
>iteration, and use it as input into the second.  To do this I need to
>calculate the starting deformation coefficients on the higher density grid.
>
>Does itk provide anything to do this?  I was unable to find any
>documentation addressing this.
>
>Thanks,
>Karl
>
>
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