convert stl file to depth map

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Yuval Braun 2020-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/517322-convert-stl-file-to-depth-map

回答： George Abrahams 2024-2-10

I built a 3d scanner whose output is a depth map. I want to check that the result is the same as the photographed object, which I printed from the stl file. Is there a way to get a depth map (from a certain perspective) given the stl file?

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KSSV 2020-4-12

YOu can read your stl file using stlread and then plot the map using trisurf.

Yuval Braun 2020-4-12

KSSV. I know, but I'm specifically interested in depth values so I can calculate the size of the error.

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Answer 1

George Abrahams 2024-2-10

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Hi @Yuval Braun, you need a renderer. My 3D Rendering Toolbox on File Exchange will easily handle this. For example, you can see the toolbox generating a depth map in the figure below.

To get an identical image, you'll need to know a few properties about the sensor used to perform the scan, namely its field-of-view and resolution. You'll also need to know the relative position between the object and sensor. Finally, if the sensor is a camera, due to lens distortion, you'll likely need to calibrate it to undistort (rectify) the image with the undistortImage function of the Computer Vision Toolbox.