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Re: Convolution with non-constant Kernel? [message #73513 is a reply to message #73461]

Sun, 14 November 2010 14:30

SonicKenking
Messages: 51
Registered: October 2010

Member

On Nov 12, 11:48 pm, Bennett <juggernau...@gmail.com> wrote:
> On Nov 11, 7:56 pm, 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!
>
> Couldn't you just perform multiple convolutions and then combine the
> result in the end using a position mask?

That probably won't work since the kernel is 2D non-linear. Also doing
convolutions multiple times may not be efficient for large arrays.

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[Message index]

		Re: Convolution with non-constant Kernel? By: Juggernaut on Fri, 12 November 2010 04:48
		Re: Convolution with non-constant Kernel? By: SonicKenking on Thu, 11 November 2010 21:57
		Re: Convolution with non-constant Kernel? By: MC on Thu, 11 November 2010 18:05
		Re: Convolution with non-constant Kernel? By: SonicKenking on Sun, 14 November 2010 14:30
		Re: Convolution with non-constant Kernel? By: James[2] on Tue, 16 November 2010 14:42

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