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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 5, Iss. 4 — Apr. 10, 2007
  • pp: 204–207

Fast algebra algorithm of shape-from-shading with specular reflectance

Lei Yang and Jiuqiang Han  »View Author Affiliations

Chinese Optics Letters, Vol. 5, Issue 4, pp. 204-207 (2007)

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Shape-from-shading (SFS) is to reconstruct three-dimensional (3D) shape from a single gray image, which is an important problem in computer vision. We propose a novel SFS method based on hybrid reflection model which contains both diffuse reflectance and specular reflectance. The intensity gradient of image is in the direction that the shape of surface changes most, so we use directional derivative of the reflectance map as parts of objective function. When discrete characteristic of digital images is considered, finite difference approximates differential operator. So the reflectance map equation described by a partial differential equation (PDE) turns into an algebra equation about the unknown surface height correspondingly. Using iterative numeric computation, a new SFS method is gained. Experiments on synthesis and real images show that the proposed SFS method is accurate and fast.

© 2007 Chinese Optics Letters

OCIS Codes
(100.5010) Image processing : Pattern recognition
(110.6150) Imaging systems : Speckle imaging

Lei Yang and Jiuqiang Han, "Fast algebra algorithm of shape-from-shading with specular reflectance," Chin. Opt. Lett. 5, 204-207 (2007)

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