find nerest point B(x,y,z) on the outersurface of the head to A (x,y,z)

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zawaiter 2013-4-13

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关闭： MATLAB Answer Bot 2021-8-20

hi experts , i have a questions i asked before but still cant solve it and hope you can help me.

i succesfuly formed a 3d image of a head from a bunch of 2d slices. i have a point say A(x,y,z). this point could be within the head or outside the head surface in the zeros area. i wish to find the nearest point say(B(x,y,z))to A(x,y,z) on the surface of the brain.

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Image Analyst 2013-4-13

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Can't you just have 3 for loops and get every distance and check? Otherwise you can try to set that point and set all the points in the head, and then call bwdist(), then scan that distance transform, but that might take more time than just doing it yourself directly with the Pythagorean theorem.

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zawaiter 2013-4-16

i dont have binary image but i think i can do it using your previouse help.but then the pixels that are part of the object will be both surface and within object voxels right? not only surface.

Image Analyst 2013-4-16

Well threshold it or something. If you want to know how close some arbitrary point is to the surface, you obviously have to know what pixels are part of your object and what pixels are part of the background, or air.

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