Adaptive light radiation intensity estimation based on variable kernel

doi:10.3724/SP.J.1087.2011.02240

Journal of Computer Applications ›› 2011, Vol. 31 ›› Issue (08): 2240-2242.DOI: 10.3724/SP.J.1087.2011.02240

• Graphics and image technology • Previous Articles Next Articles

Adaptive light radiation intensity estimation based on variable kernel

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

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

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. 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

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)

Abstract

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

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

CLC Number:

Hai-bo WANG Wen-hui ZHANG Hui-hua YANG Huan CHEN. Adaptive light radiation intensity estimation based on variable kernel[J]. Journal of Computer Applications, 2011, 31(08): 2240-2242.

王海波张文辉杨辉华周欢. 基于可变核的自适应光辐射强度估算[J]. 计算机应用, 2011, 31(08): 2240-2242.

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Adaptive light radiation intensity estimation based on variable kernel

基于可变核的自适应光辐射强度估算

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