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09/07/05 06:19am

I use the digital image processing add-on in order to process images of periodic structures. What I would like to do is extract the greyvalues from the matrix (512x512) that corresponds to the power spectrum along the border of a circular region of intereset around the centre of the spectrum. According to the documentation, the data can only be retrieved using graphic primitives such as line or polygon, but not circle, although the information is conflicting. Drawing the ROI by hand in the image is not on as the method should be reproducible. I would be very grateful for any suggestions.

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