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Surface reconstruction using coded structured light is considered one of the most reliable techniques for high-quality 3D scanning. With\uda calibrated projector-camera stereo system, a light pattern is projected onto the scene and imaged by the camera. Correspondences\udbetween projected and recovered patterns are computed in the decoding process, which is used to generate 3D point cloud of the surface.\udHowever, the indirect illumination effects on the surface, such as subsurface scattering and interreflections, will raise the difficulties in\udreconstruction. In this paper, we apply maximum min-SW gray code to reduce the indirect illumination effects of the specular surface.\udWe also analysis the errors when comparing the maximum min-SW gray code and the conventional gray code, which justifies that\udthe maximum min-SW gray code has significant superiority to reduce the indirect illumination effects. To achieve sub-pixel accuracy,\udwe project high frequency sinusoidal patterns onto the scene simultaneously. But for specular surface, the high frequency patterns are\udsusceptible to decoding errors. Incorrect decoding of high frequency patterns will result in a loss of depth resolution. Our method to\udresolve this problem is combining the low frequency maximum min-SW gray code and the high frequency phase shifting code, which\udachieves dense 3D reconstruction for specular surface. Our contributions include: (i) A complete setup of the structured light based 3D\udscanning system; (ii) A novel combination technique of the maximum min-SW gray code and phase shifting code. First, phase shifting\uddecoding with sub-pixel accuracy. Then, the maximum min-SW gray code is used to resolve the ambiguity resolution. According to\udthe experimental results and data analysis, our structured light based 3D scanning system enables high quality dense reconstruction of\udscenes with a small number of images. Qualitative and quantitative comparisons are performed to extract the advantages of our new\udcombined coding method

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

STRUCTURED LIGHT BASED 3D SCANNING FOR SPECULAR SURFACE BY THE COMBINATION OF GRAY CODE AND PHASE SHIFTING