How filters work

B
Posted By
beebs1
Apr 10, 2005
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388
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Hi,

I am very interested in 2D image manipulation, and from google I have managed to find out about convolution using kernels, which seems to be the way a lot of photoshop-style effects are produced. I have tried searching on amazon for books related to the subject, but all I can find are books on 3D graphics programming :-/

Can anyone recommend a source for learning about how it is all done, and what kernels produce what effects, etc?

Many thanks
James

..
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Hank McCall
Apr 10, 2005
James wrote:
Hi,

I am very interested in 2D image manipulation, and from google I have managed to find out about convolution using kernels, which seems to be the way a lot of photoshop-style effects are produced. I have tried searching on amazon for books related to the subject, but all I can find are books on 3D graphics programming :-/

Can anyone recommend a source for learning about how it is all done, and what kernels produce what effects, etc?

Many thanks
James

.
The kernel filter is a 2 dimensional version of the (1 dimensional) FIR filter used in digital signal processing of electronic signals. You should lookup the following things in Google: FIR filter, IIR filter, Fourier Transform, DFT, FFT. They are all interrelated and describe what different effects come from the numbers in the kernel.
PH
Peter Heckert
Apr 11, 2005
Hello James,

James wrote:
Can anyone recommend a source for learning about how it is all done, and what kernels produce what effects, etc?
<http://www.cee.hw.ac.uk/hipr/html/hipr_top.html>
A lot of other universitarys have also introductory stuff online.

hth,

Peter

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