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Application of Stereo Vision for Shape Measurement of Free-form Surface using Shape-from-shading

자유곡면의 형상 측정에서 shape-from-shading을 접목한 스테레오 비전의 적용

  • 양영수 (전남대학교 기계공학과) ;
  • 배강열 (경남과학기술대학교 메카트로닉스공학과)
  • Received : 2017.08.21
  • Accepted : 2017.09.04
  • Published : 2017.10.31

Abstract

Shape-from-shading (SFS) or stereo vision algorithms can be utilized to measure the shape of an object with imaging techniques for effective sensing in non-contact measurements. SFS algorithms could reconstruct the 3D information from a 2D image data, offering relatively comprehensive information. Meanwhile, a stereo vision algorithm needs several feature points or lines to extract 3D information from two 2D images. However, to measure the size of an object with a freeform surface, the two algorithms need some additional information, such as boundary conditions and grids, respectively. In this study, a stereo vision scheme using the depth information obtained by shape-from-shading as patterns was proposed to measure the size of an object with a freeform surface. The feasibility of the scheme was proved with an experiment where the images of an object were acquired by a CCD camera at two positions, then processed by SFS, and finally by stereo matching. The experimental results revealed that the proposed scheme could recognize the size and shape of freeform surface fairly well.

Keywords

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