Lighting estimation of a convex Lambertian object using weighted spherical harmonic frames

CASIA OpenIR > 智能制造技术与系统研究中心 > 多维数据分析（彭思龙）-技术团队

	Lighting estimation of a convex Lambertian object using weighted spherical harmonic frames
	Zhao, Wenyong; Zheng, Yuan; Wang, Lu; Peng, Silong; Wenyong Zhao
发表期刊	中国
	2012
卷号	9(1)期号:2015年09 页码:57–75
摘要	An 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.
关键词	Lighting Estimationweighted Spherical Harmonic Frame Lambertian
文献类型	期刊论文
条目标识符	http://ir.ia.ac.cn/handle/173211/12963
专题	智能制造技术与系统研究中心_多维数据分析（彭思龙）-技术团队
通讯作者	Wenyong Zhao
推荐引用方式 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.