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x y coordinates of image pixels for an image outline

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118077] x y coordinates of image pixels for an image outline
  • From: william parr <willpowers69 at hotmail.com>
  • Date: Tue, 12 Apr 2011 05:54:08 -0400 (EDT)

Dear Mathgroup,

I think this problem is fairly straight forward, but I'm struggling with it!

essentially, I want to;
1) determine/assign x y coordinate values to the black pixels in a binarised image.
2) select the outline black pixels (and get their x y coordinates) on each line of the image.

This falls within a larger project of wanting to recover the outside outline (ie surface outline with x y coordinates) of a bone from a CT slice image. I would then probably aim to create a 3D point cloud for the external bone surface by assigning each slice a z coordinate value. However, unless anyone has a very clever (ie not processor intensive) way of of creating a polygon mesh from the 3D point cloud, I will probably export the point cloud for surface meshing in another program.

thanks in advance,

Will


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