Remove extrema of objects in image

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Melvin 2013-7-16

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Good morning everyone,

I have a 3D binary image of trabecular bone, and I need the trabeculae to be separated so that I can extract properties of each trabucula, i.e. volume, dimensions, etc. In order to do this, I decided on removing the pixels representing the extrema of each trabecula. I have 2 Nx3 matrices representing the endpoints of each trabecula in the image, and I would like to remove all of these points. How can this be done? Thanks in advance

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Matt Kindig 2013-7-16

How are the "extrema" defined? Can you post an example of the Nx3 endpoints definition, as well as an image describing what you are attempting to do?

Melvin 2013-7-16

在 MATLAB Online 中打开

The extrema was defined as the point (pixel) where the labeled object (trabecula) has its final point in the major axis. This is done in 3D using ImageJ, and I exported the results as xls. The spreadsheet was imported into my code, and I extracted the extrema from the spreadsheet in an Nx3 matrix as follows:

EP1 = C(:,3:5); EP2 = C(:,6:8); EP = vertcat(EP1,EP2);

I thought about plotting these points, converting the plot into an image w/ the same dimensions as my original image, and then taking the difference between the images, but I'm not sure how to go about this.

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Answer 1

Image Analyst 2013-7-16

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A screenshot would help. If you want to "lop off" extrema from an image, you can use imopen() but I can't really tell if that would help with your images or not since I can't visualize what you're saying.