基于能量控制的球面谐波函数光照演示方法  

Illumination rendering method of coefficients of spherical harmonics based on energy controlling

作　　者：朱丽华[1] 顾耀林[1] 

机构地区：[1]江南大学信息工程学院,江苏无锡214122

出　　处：《计算机工程与设计》2007年第19期4705-4707,共3页Computer Engineering and Design

摘　　要：目前在光照模型中常用球面谐波函数(SH)来表示不同的光特性,该函数可通过控制它的基函数因子数量得到不同的光照效果,而传统的方法存在过程复杂、抗干扰能力差的缺点,为此研究并提出了基于能量控制光照模型中球面谐波函数因子的理论,新方法考虑到图像压缩对SH的因子带来噪音,提出对量化过程进行建模,分析施加的能量约束条件,求解出最恰当的因子数。实验结果表明新方法在光照模型中能有效地控制球面谐波函数因子,其对应的图像效果也较好。Spherical harmonics （SH） have been widely used for representing various properties in the illumination rendering modeling, through controlling the number of the SH coefficients to get different illumination effect. The disadvantages are that the course is complex and the noise-resistant of these SH coefficients is bad. In order to avoid the problems, a new method is proposed. It is to control the coefficients of Spherical Harmonics based on energy. Considering the quantization noise, the quantization effect is modeled, then the constraint of energy to get the appropriate number is analyzed. Experimental results show that the new method can provide good visual quality.

关 键 词：球面谐波函数 最小二乘法 奇异值分解 朗伯反射 量化噪音 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]