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Shape-from-Shading for Oblique Lighting with Accuracy Enhancement by Light Direction Optimization

EURASIP Journal on Advances in Signal Processing volume 2006, Article number: 092456 (2006) Cite this article

Abstract

We present a shape-from-shading approach for oblique lighting with accuracy enhancement by light direction optimization. Based on an application of the Jacobi iterative method to the consistency between the reflectance map and image, four surface normal approximations are introduced and the resulting four iterative relations are combined as constraints to get an iterative relation. The matrix that converts the shading information to the depth is modified so as to be uniform over the whole image region, making the iteration stable and, as a result, the resulting shape more accurate. Then, to enhance the accuracy, the light direction is optimized for slant angle using two criteria based on the initial boundary value and the rank of the converting matrix. The method is examined using synthetic and real images to show that it is superior to the current state-of-the-art methods and that it is effective for oblique light direction whose slant angle ranges from 55 to 75 degrees.

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  1. Faculty of Engineering, Takushoku University, 815-1 Tate-machi, Hachioji Tokyo, 193-0985, Japan

    Osamu Ikeda

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  1. Osamu Ikeda
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Correspondence to Osamu Ikeda.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ikeda, O. Shape-from-Shading for Oblique Lighting with Accuracy Enhancement by Light Direction Optimization. EURASIP J. Adv. Signal Process. 2006, 092456 (2006). https://doi.org/10.1155/ASP/2006/92456

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  • DOI: https://doi.org/10.1155/ASP/2006/92456

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