2D x-correlation

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Mon, 04/11/2011 - 05:11 pm

Hi,
I want to "filter" an image /2D wave by calculating the 2D crosscorelation between the image an a much smaller image, an image "kernel". This smaller image is ussualy a 2D gauss,in case this makes it easier.

Thanks for any help!

cheers
Ralf
Hello Ralf,

sounds like you what you want to do is fairly standard. You may want to take a look at the ImageFilter, MatrixConvolve, and MatrixOP operations for more information on how to implement this in Igor.

April 11, 2011 at 07:19 pm - Permalink

Hello Ralf,

This topic was covered originally in the Image Processing Tutorial which you can find under File Menu -> Example Experiments -> Tutorials.

Image filtering is actually a convolution not correlation but the differences (in the case of gaussian filters) are not significant. If the built-in gaussian filter (under MatrixFilter) is not appropriate for your application you should try MatrixOP convolve with opt set to -1 or -2.

A.G.
WaveMetrics, Inc.

April 12, 2011 at 10:02 am - Permalink