计算机应用 ›› 2011, Vol. 31 ›› Issue (08): 2240-2242.DOI: 10.3724/SP.J.1087.2011.02240

• 图形图像技术 • 上一篇    下一篇

基于可变核的自适应光辐射强度估算

王海波1,2,张文辉1,杨辉华1,周欢1   

  1. 1. 桂林电子科技大学 计算机科学与工程学院,广西 桂林541004
    2. 湖南科技学院 信息技术与教育系,湖南 永州425000
  • 收稿日期:2011-02-16 修回日期:2011-04-21 发布日期:2011-08-01 出版日期:2011-08-01
  • 通讯作者: 张文辉
  • 作者简介:王海波(1980-),男,湖南郴州人,硕士研究生,主要研究方向:真实感绘制;张文辉(1970-),女,湖南沅江人,副教授,硕士,主要研究方向:计算机辅助软件工程;杨辉华(1972-),男,湖南澧县人,教授,博士,主要研究方向:智能计算;周欢(1990-),男,江西吉安人,硕士研究生,主要研究方向:真实感图形生成。
  • 基金资助:

    国家自然科学基金资助项目(60803092)

Adaptive light radiation intensity estimation based on variable kernel

Hai-bo WANG1,2,Wen-hui ZHANG2,Hui-hua YANG2,Huan CHEN2   

  1. 1. Department of Information Technology and Education, Hunan University of Science and Engineering, Yongzhou Hunan 425000, China
    2. School of Computer Science and Engineering, Guilin University of Electronic Technology, Guilin Guangxi 541004, China
  • Received:2011-02-16 Revised:2011-04-21 Online:2011-08-01 Published:2011-08-01
  • Contact: Wen-hui ZHANG

摘要: 针对传统的K最近邻(K-NN)光辐射强度估算只能通过发射大量的光子、增加光子密度来提高估算精度这一缺陷,提出用具有平滑性的可变核(VK)函数估算光辐射强度,通过计算光子到估算点的距离与该光子预先分配的半径之比,实现与传统估算算法不同的自适应光辐射强度估算。实验结果表明,VK算法不需发射大量光子就能改善图像质量且渲染速度快。

关键词: 光辐射强度估算, K最邻近算法, 可变核函数, 自适应

Abstract: The conventional light radiation intensity estimation of K-Nearest Neighbor (K-NN) algorithm can only be improved by increasing the density of photons. The authors replaced the K-NN algorithm with Variable Kernel (VK) method which inherited the properties of smoothing kernel, and estimated the light radiation intensity for different surface point adaptively by calculating the ratio of the assigned radius of each photon to the distance between the photon and the surface point. The experimental results show that the VK algorithm is faster than K-NN algorithm and it can improve image quality without shooting a great number of photos.

Key words: light radiation intensity estimation, K-Nearest Neighbor (K-NN) algorithm, Variable Kernel (VK), self-adaptive

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