how to fill a surface to obtain a 3D mask

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Mads 2018-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/376486-how-to-fill-a-surface-to-obtain-a-3d-mask

评论： Mads 2018-1-11

I have a script that gives me 3D coordinates of the surface of a 3D object.

I would like to obtain a mask in 3D where everything on and inside the surface is true, and everthing outside the surface is false.

The mask could for example be of size 64-by-64-by-64.

Roughly speaking a 3D version of imfill() that tolerates not all points being connected once they are placed in the mask grid.

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Answer 1

Image Analyst 2018-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/376486-how-to-fill-a-surface-to-obtain-a-3d-mask#answer_299496

Is there any problem with just doing it one slice at a time using imfill()?

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Mads 2018-1-11

When for a given slice the points are connected, there is no problem. But when the curve is not closed imfill() doesn't work. I have tried imdilate() followed by imerode() to "invent" the missing points, but the operations seem to be a bit too harsh on the other parts of the curve. I wonder if there is some interpolation method that can fill out missing portions of the curve to close it...

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