Photometric stereo is a technique that extracts surface elevation by computing the surface normals assuming the intensity is directly proportional to brightness. Using N light sources (V) , the surface normal of each point in the image can be computed following the steps in the image below. (click to zoom for clearer picture)
applying these steps to four light sources with images below, we reconstruct the corresponding shape elevation.
The result is shown below:
The reconstruction is relatively correct but with 'horns' on top and on the edges. Also the image is not smooth and some filtering is recommended.In this activity, I give myself a grade of 10 for successfully reconstructing the image.
I would like to thank Martin Tensuan for useful discussions.
References:
[1] Applied Physisc 187 Manual (c)2008 Maricor Soriano
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