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Transformation from log-polar to Cartesian

asked 2013-04-10 15:07:42 -0500

luksdoc gravatar image

updated 2013-04-10 15:15:55 -0500

I have one simple (and perhaps stupid) question. I am using OpenCV 2.1.

  • I transform the original image (320 x 240) to a log-polar image of resolution (200 x 200) by using CvLogPolar function with the magnitude parameter 40, and center of the image set as the center of transformation.
  • I perform some processing, and obtain a single point (centroid of the blob) in the log polar coordinates.

-My question: How to transform coordinate values of the point from log-polar to Cartesian frame, i.e. to the coordinates of the original image? (I just need to transform the computed values, not the whole image)?

Thanks.

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answered 2013-04-11 06:07:42 -0500

I think you could have found this yourself using google, but here is the transformation for going back to carthesian coördinates once you have a point in log polar coördinates.

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Asked: 2013-04-10 15:07:42 -0500

Seen: 1,583 times

Last updated: Apr 11 '13