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Re: Convolution with non-constant Kernel? [message #73524 is a reply to message #73468]

Fri, 12 November 2010 14:03

rogass
Messages: 200
Registered: April 2008

Senior Member

On 12 Nov., 01:56, SonicKenking <ywa...@gmail.com> wrote:
> Hi, I wonder if there is an easy way to perform convolution on an
> array with non-constant kernel.
>
> The IDL built-in CONVOL function requires the kernel to be a fixed
> array, e.g.
> [-1,2,-1]. I want to have a dynamic kernel that changes based on the
> position of the array. Something like
>
> array = [8,6,7,9,1,3,4,5], kernel=[sin(index_i-1), 2, sin(index_i+1)]
>
> Is there any other built-in IDL function that can do this or is there
> someone who has already coded this up? If the answer is no, I'll go
> ahead and code my own program. Just checking it here beforehand to
> avoid re-inventing wheels.
>
> Thanks!

If you are interested. I have a routine which strictly performs
discrete convolutions for a 2d array and a 3d kernel without zero
padding, without loops and for small kernels faster than fft. Just
send me an email.

Cheers

CR

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[Message index]

		Convolution with non-constant Kernel? By: SonicKenking on Thu, 11 November 2010 16:56
		Re: Convolution with non-constant Kernel? By: Juggernaut on Sat, 13 November 2010 08:23
		Re: Convolution with non-constant Kernel? By: rogass on Fri, 12 November 2010 14:03
		Re: Convolution with non-constant Kernel? By: rogass on Fri, 19 November 2010 02:07
		Re: Convolution with non-constant Kernel? By: Gray on Wed, 17 November 2010 12:52

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