[Insight-users] Support for BiLinear and Bicubic Interploation types

[Sharath Venkatesha]

Hi Luis,

Thanks for the clarification on the bi-linear interpolation.

By bicubic, I mean extension of the cubic hermite spline method for interpolating points in a grid. In a simple implementation, I remember for bilinear we take the values of the neighbors and interpolate them; In bi-cubic, the value of the neighbours, and its second neighbors are also taken for interpolation, with a more complex equation to be solved, and hence finer interpolation.
The complexity is greater than bilinear and less than bspline.

Thanks,
Sharath





----- Original Message ----
From: Luis Ibanez <luis.ibanez at kitware.com>
To: Sharath Venkatesha <sharath20284 at yahoo.com>
Cc: Insight users <insight-users at itk.org>
Sent: Wednesday, July 8, 2009 2:33:18 PM
Subject: Re: [Insight-users] Support for BiLinear and Bicubic Interploation types



Hi Sharath,


(a) Yes, the BSplineInterpolateImageFunction can be used
    along with any Transform. It use is not limited to
    deformable registration by any means.

    Note however, that is computationally more expensive
    than the linear interpolator.


(b) The LinearInterpolator in ITK is N-Dimensional.

    So, it will perform Bilinear interpolation in a 2D image
    and it will perform Trilinear interpolation in a 3D image.



(c) What do you call a "Bicubic" type ?
    Please clarify,



    Thanks


       Luis



---------------------------
Sharath Venkatesha wrote:
> Hi,
> 
> I am currently using LinearInterpolationFunction filter, and want to use a better interpolation for registration. The manual says that the next option is BSplineInterpolateImageFunction.
> 
> (a) Can  BSplineInterpolateImageFunction be used with Rigid transformations? I have generally read that it is used with deformable transformations.
> (b) Is there a support for simpler Bilinear and Bicubic types?
> 
> Thanks,
> Sharath
> 
> 
> 
>      
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