CASIA OpenIR  > 智能制造技术与系统研究中心  > 多维数据分析
Lighting estimation of a convex Lambertian object using weighted spherical harmonic frames
Zhao, Wenyong; Zheng, Yuan; Wang, Lu; Peng, Silong; Wenyong Zhao
Source Publication中国
2012
Volume9(1)Issue:2015年09Pages:57–75
AbstractAn explicit lighting estimation from a single image of Lambertian objects is influenced by two factors: data incompletion and noise contamination. Measurement of lighting consistency purely using the orthogonal spherical harmonic basis cannot achieve an accurate estimation. We present a novel signal-processing framework to represent the lighting field. We construct a weighted spherical harmonic frame with geometric symmetry on the sphere S2S2 . Weighted spherical harmonic frames are defined over the generating rotation matrices about symmetry axes of finite symmetry subgroups of SO(3)SO(3) , and the generating functions are weighted spherical harmonic basis functions. Compared with the orthogonal spherical harmonic basis, the redundant weighted spherical harmonic frames not only describe the multidirectional lighting distribution intuitively, but also resist the noise theoretically. Subsequently, we analyze the relationship of the irradiance to the incoming radiance in terms of weighted spherical harmonic frames and reconstruct the lighting function filtered by the Lambertian BRDF (bidirectional reflectance distribution function). The experiments show that the frame coefficients of weighted spherical harmonic frames can better characterize the complex lighting environments finely and robustly.
KeywordLighting Estimationweighted Spherical Harmonic Frame Lambertian
Document Type期刊论文
Identifierhttp://ir.ia.ac.cn/handle/173211/12963
Collection智能制造技术与系统研究中心_多维数据分析
Corresponding AuthorWenyong Zhao
Recommended Citation
GB/T 7714
Zhao, Wenyong,Zheng, Yuan,Wang, Lu,et al. Lighting estimation of a convex Lambertian object using weighted spherical harmonic frames[J]. 中国,2012,9(1)(2015年09):57–75.
APA Zhao, Wenyong,Zheng, Yuan,Wang, Lu,Peng, Silong,&Wenyong Zhao.(2012).Lighting estimation of a convex Lambertian object using weighted spherical harmonic frames.中国,9(1)(2015年09),57–75.
MLA Zhao, Wenyong,et al."Lighting estimation of a convex Lambertian object using weighted spherical harmonic frames".中国 9(1).2015年09(2012):57–75.
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