Mesh-Based Semi-Calibrated Photometric Stereo with Near Quasi Point Lights

• Published in: Shanghai jiao tong da xue xue bao Vol. 28; no. 5; pp. 577 - 586
• Main Authors: Chen, Qiheng, Peng, Na, Lü, Na, Tao, Wei, Zhao, Hui
• Format: Journal Article
• Language: English
• Published: Shanghai Shanghai Jiaotong University Press 01.10.2023; Springer Nature B.V
• Subjects: Algorithms; Architecture; Calibration; Computer Science; Electrical Engineering; Engineering; Life Sciences; Light sources; Lighting; Luminous intensity; Materials Science; Nonuniformity; Photometry; Recovery; 光度立体; A; shape recovery; non-uniform light sources; mesh deformation; 形貌重建; photometric stereo; 栅格变形; 非均一光源; TP 301
• ISSN: 1007-1172; 1995-8188
• DOI: 10.1007/s12204-022-2414-9

Non-uniformity of light sources is one of the inevitable error factors causing poor shape recovery accuracy of photometric stereo methods under close-range lighting with quasi point lights. Semi-calibrated photometric stereo methods are required to avoid repeated, tedious and impractical photometric calibration. In this paper, two simple, concise but effective mesh-based semi-calibrated photometric stereo methods are proposed. The proposed methods extend the traditional mesh-based photometric stereo methods and further allow joint and accurate estimation of normals and non-uniform light intensities by alternatively updating normals, depth maps and intensities. Extensive experiments are conducted to validate the effectiveness and robustness of the proposed algorithms. Even under extremely severe non-uniform lighting, the proposed methods can still suppress the error and improve the shape recovery accuracy by up to 65.6% in real-world experiments.