Re: Image processing of Centroid and Radius
- To: mathgroup at smc.vnet.net
- Subject: [mg131046] Re: Image processing of Centroid and Radius
- From: stephen.p.luttrell at gmail.com
- Date: Thu, 6 Jun 2013 07:28:28 -0400 (EDT)
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You can detect a circular feature in an image by correlating the image with a kernel image of a circle with the same radius. I had a quick look at your image (http://img850.imageshack.us/img850/6925/samplerd.png), and found that the following code nicely detects your circular feature. im = <your image> im2 = im // ImageAdjust // ColorNegate ker = {FaceForm[White], EdgeForm[{Black, Thickness[0.1]}], Disk[]} // Graphics // Rasterize[#, ImageSize -> 140] & // ColorNegate corr = ImageCorrelate[im2, ker] // ImageAdjust This solution needs to be tidied up and extended, but this approach gives you a fairly direct way of extracting the centroid and radius as you requested. Stephen Luttrell
