* Fit the circle of chrome sphere from manual extracted points.
* Find lighting direction from given chrome sphere.
* Estimate light strength or refine lighting matrix by solving a nonlinear least squares problem.
* Perform photometric stereo to recover albedo and normal map.
* Recover depth map from estimated normal vector field.
Ying Xiong (2022). PSBox (https://www.mathworks.com/matlabcentral/fileexchange/45250-psbox), MATLAB Central File Exchange. Retrieved .
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