|
|
论文:2018,Vol:36,Issue(6):1069-1075 |
|
|
引用本文： |
|
|
杨尧, 马万超, 王哲, 张凯, 苗锡奎. 基于BRDF测量的Schlick模型改进方法研究[J]. 西北工业大学学报 |
|
|
Yang Yao, Ma Wanchao, Wang Zhe, Zhang Kai, Miao Xikui. Research on Improved Method of Schlick Model Based on BRDF Measurement[J]. Northwestern polytechnical university |
|
|
|
|
|
|
|
| 基于BRDF测量的Schlick模型改进方法研究 |
|
| 杨尧1, 马万超2, 王哲1, 张凯1, 苗锡奎3 |
|
1. 西北工业大学 航天学院, 陕西 西安 710072;
2. 上海航天技术研究院, 上海 210009;
3. 光电对抗测试评估技术重点实验室, 河南 洛阳 471003 |
| 摘要: |
| 在红外场景仿真中Schlick模型是常用的双向反射分布函数（BRDF）模型，通过BRDF测量试验与Schlick模型计算结果比较发现该模型在出射天顶角小于入射天顶角时能够较好地与实际输出吻合，但是当出射天顶角大于入射天顶角一定角度的情况下，其函数值输出会随着出射天顶角的增大而逐渐增大，与实际现象不一致，为此，提出了一种新的Schlick改进模型，基于朗伯反射原理设计了一种余弦补偿函数，当出射天顶角大于入射天顶角时该函数与原Schlick模型结合，能够更好地表现大出射天顶角时的光照反射效果，通过与实验数据对比，表明改进后的Schlick模型与实验结果吻合，并针对两种飞机模型开展光照渲染效果对比，结果表明基于改进后的Schlick模型生成的光照渲染效果优于原Schlick模型生成的渲染效果。 |
| 关键词:
双向反射分布函数
Schlick模型
红外场景仿真
图像渲染
|
|
| Research on Improved Method of Schlick Model Based on BRDF Measurement |
|
| Yang Yao1, Ma Wanchao2, Wang Zhe1, Zhang Kai1, Miao Xikui3 |
|
1. School of Astronautics, Northwestern Polytechnical University, Xi'an 710072 China;
2. Shanghai Academy of Spaceflight Technology, Shanghai 210009, China;
3. Key Laboratory of Electro-Optical Countermeasures Test & Evaluation Technology, Luoyang 471003, China |
| Abstract: |
| In simulating an infrared scene, the Schlick model uses a commonly-used bidirectional reflection distributional function(BRDF) model. Through simulation and BRDF measurement, this paper points out that the Schlick model is in better agreement with the actual output when the emerging zenith angle is smaller than the incident zenith angle. But when the emerging zenith angle is a certain angle larger than the incident zenith angle, the output of the function value may increase with the increasing emerging zenith angle and may not be in agreement with the actual output. In this paper, a new improved Schlick model is proposed, and a cosine compensation function is designed based on Lambert reflection principle. When the zenith angle is larger than the incident zenith angle, which guarantees the monotonous decreasing of the output of the function through the compensation function when the emerging zenith angle is larger than the incident zenith angle. The results on comparison with experimental data show that the improved Schlick model is basically in agreement with experimental results. The results on comparison with the heightened illumination effect of the fighters model show that the heightened illumination effect produced with the improved Schlick model is superior to that produced with the original Schlick model. |
| Key words:
bidirectional reflection distribution function
Schlick model
infrared scene simulation
image rendering
|
|
| 收稿日期: 2017-12-28
修回日期:
|
| DOI: |
| 基金项目: 光电对抗测试评估技术重点实验室基金（GKCP2016003）资助 |
| 通讯作者:
Email： |
| 作者简介: 杨尧(1982-),西北工业大学助理研究员、博士,主要从事红外建模与仿真研究。
|
|
| 相关功能 |
|
|
|
|
| 作者相关文章 |
|
| 杨尧 在本刊中的所有文章 |
| 马万超 在本刊中的所有文章 |
| 王哲 在本刊中的所有文章 |
| 张凯 在本刊中的所有文章 |
| 苗锡奎 在本刊中的所有文章 |
|
|
|
|
|
|
|
|
参考文献: |
|
|
[1] 杨东升, 孙嗣良, 戴冠中. 基于三维模型的飞机红外图像仿真研究[J]. 西北工业大学学报, 2010, 28(5):758-763 Yang Dongsheng, Sun Siliang, Dai Guanzhong. Infrared Image Simulation of an Aircraft Based on Its Three-Dimensional Model[J]. Journal of Northwestern Polytechnical University, 2010, 28(5):758-763(in Chinese)
[2] Wu X, Zhang J, Chen Y, et al. Real-Time Mid-Wavelength Infrared Scene Rendering with a Feasible BRDF Model[J]. Infrared Physics & Technology, 2015, 68:124-133
[3] Nicodemus F E, Richmond J C, Hsia J J, et al. Geometrical Considerations and Nomenclature for Reflectance[J]. Applied Optic, 1977, 9:1474-1475
[4] Guarnera D, Guarnera G C, Ghosh A, et al. BRDF Representation and Acquisition[J]. Computer Graphics Forum, 2016, 35(2):625-650
[5] 周璟然, 韦巍, 王成龙. BRDF模型研究综述[J]. 电子技术与软件工程, 2016(18):109-110 Zhou Jingran, Wei Wei, Wang Chenglong. Review of BRDF Model Research[J]. Iectronic Technology & Software Engineering, 2016(18):109-110(in Chinese)
[6] Bui Tuong Phong, Illumination for Computer Generated Pictures[J]. ACM Computer Graphics, 1975, 18(6):311-317
[7] Strauss P S. A Realistic Lighting Model for Computer Animators[J]. IEEE Computer Graphics & Applications, 2002, 10(6):56-64
[8] 李敏, 杨壹斌, 王亚楠,等. 一种Blinn-Phong BRDF红外反射模型的研究[J]. 计算机工程与科学, 2018(1):101-107 Li Min, Yang Yibin, Wang Yanan, et al. A Blinn-Phong BRDF Infrared Reflection Model[J]. Computer Engineering and Science, 2018(1):101-107(in Chinese)
[9] 李敏, 解鸿文, 徐中外,等. 基于光线跟踪和BRDF模型的红外高光反射仿真[J]. 激光与红外, 2018(1):68-72 Li Min, Xie Hongwen, Xu Zhongwai, et al. Simulation of Infrared Specular Reflection Based on Ray Tracing and BRDF Model[J]. Laser & Infrared, 2018(1):68-72(in Chinese)
[10] Matusik W, Pfister H, Brand M, et al. A Data-Driven Reflectance Model[J]. ACM Trans on Graphics, 2003, 22(3):759-771
[11] 马文维. 几种典型材料表面的双向反射特性建模与实验测量研究[D]. 武汉:华中科技大学, 2014 Ma Wenwei. Experimental and Model Study on Surface BRDF for Several Typical Materials[D]. Wuhan, Huazhong University of Science and Technology, 2014(in Chinese)
[12] Cook R L, Torrance K E. A Reflectance Model for Computer Graphics[J]. ACM Trans on Craphics, ACM, 1982, 1(1):7-24
[13] Schlick C. An Inexpensive BRDF Model for Physically-Based Rendering[J]. Computer Graphics Forum, 2010, 13(3):233-246
[14] 李明哲, 赵继广, 杨帆. 基于统计与遗传算法的Cook-Torrance模型研究[J]. 装备学院学报, 2016, 27(1):116-121 Li Minzhe, Zhao Jinguang, Yang Fan. Analysis of Cook-Torrance Model Based on Genetic Algorithm and Statistical Method[J]. Journal of Equipment Academy, 2016, 27(1):116-121(in Chinese)
[15] Huang X, Zhang J, Zhang S, et al. GPU-Based High-Precision Real-Time Radiometric Rendering for IR Scene Generation[J]. Infrared Physics & Technology, 2014, 65(5):134-143 |
|
|
|
|
|
|
|
