[Insight-users] ConvolutionImageFilter only works with scalar images?

[Gelas, Arnaud Joel Florent]

Hi David,

The problem with this filter is that the kernel image is of the same type as the input image.
I guess this filter needs an additional template argument for the kernel image (a scalar image), like this the input image could theoretically be of any type (scalar, vector, tensor) ?

Arnaud

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From: insight-users-bounces at itk.org [insight-users-bounces at itk.org] On Behalf Of David Doria [daviddoria at gmail.com]
Sent: Saturday, December 04, 2010 3:47 PM
To: ITK
Subject: [Insight-users] ConvolutionImageFilter only works with scalar  images?

(It looked like my message bounced, sorry if this is a duplicate...)

I am trying to do a convolution with RGB images:

typedef itk::Image<itk::CovariantVector<unsigned char, 3>, 2> ColorImageType;

However, I am getting a compiler error that the ConvolutionImageFilter
can't convert my itk::CovariantVector<unsigned char, 3> to a double
(of course not).

It is due to lines like this in the filter:

sum += static_cast< double >( It.Get() ); // trying to cast a
itk::CovariantVector<unsigned char, 3> as a double

Isn't convolution with an image with pixels of N components a pretty
standard operation? The filter would just separate the image and the
kernel into their separate components and perform the convolution on
each component separately. (Is there a filter to do this separation of
channels?)

Has anyone done this type of convolution and have a method to share?

David
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