Deviation correction method for close-range photometric stereo with nonuniform illumination

Hao Fan, Lin Qi, Nan Wang, Junyu Dong, Yijun Chen, Hui Yu

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Abstract

Classical photometric stereo requires uniform collimated light, but point light sources are usually employed in practical setups. This introduces errors to the recovered surface shape. We found that when the light sources are evenly placed around the object with the same slant angle, the main component of the errors is the low-frequency deformation, which can be approximately described by a quadratic function. We proposed a postprocessing method to correct the deviation caused by the nonuniform illumination. The method refines the surface shape with prior information from calibration using a flat plane or the object itself. And we further introduce an optimization scheme to improve the reconstruction accuracy when the three-dimensional information of some locations is available. Experiments were conducted using surfaces captured with our device and those from a public dataset. The results demonstrate the effectiveness of the proposed approach.
Original languageEnglish
JournalOptical Engineering
Volume56
Issue number10
Early online date6 Oct 2017
DOIs
Publication statusEarly online - 6 Oct 2017

Keywords

  • photometric stereo
  • nonuniform illumination
  • deviation correction

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