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find sphere in the range of radius in 3D matrix

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Erfaneh
Erfaneh 2014-9-12
评论： Image Analyst 2014-9-13
Is there any function like imfindcircles(image,[radius1 radius2]) in 3D? I want detect all object like sphere in range of two radius.

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回答（1 个）

Image Analyst
Image Analyst 2014-9-12
What I'd do is to binarize your image then label it and call regionprops(). Get things like the volume (area), bounding box, surface area (perimeter), etc. and see which of those is close to the values you'd expect for a perfect sphere..
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Erfaneh
Erfaneh 2014-9-12
I did this job that you said before. I keep all objects that they have the range of volume. but in my binary matrix remain some objects that they are in the range with different shape. I want to keep just the object that it like a sphere.
Image Analyst
Image Analyst 2014-9-13
Then calculate the surface area and the volume and compute the sphericity. See Wikipedia for the formula: http://en.wikipedia.org/wiki/Sphericity

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