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改进的基于屏幕空间环境遮挡 被引量：3

Improved Screen Space Ambient Occlusion
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摘要 基于屏幕空间环境遮挡以牺牲计算精度与部分效果作为代价,换取场景的实时渲染.文中针对基于屏幕空间环境遮挡技术在采样方式、遮挡因子计算和平滑滤波3个方面的缺陷,提出相应的改进方法.采样方式方面,在三维空间构建平行于投影平面的圆盘,并根据其在屏幕的投影来计算采样范围,然后采用类似正态分布的方法结合随机纹理,对采样范围内的纹素采样;在遮挡因子计算方面,增加衰减系数,调整采样点对遮挡因子的贡献;最后,使用双边滤波来平滑图像,保持场景边缘,突出细节信息. Screen-space ambient occlusion algorithm achieves real-time rendering speed at the cost of precision and visual effects. This paper presents an improved screen-based ambient occlu- sion algorithm which addresses the following three issues, sampling process, computation of occlusion factor and smooth filter. With respect to the sampling process, a more accurate sam- pling region of the pixels in image space is determined by projecting a 3D circle disk in the image plane. Then the sampling process is improved by combining the normal distribution with random texture. Some coefficients are added in the occlusion computation formula to adjust the contribu- tion of sampled points. Finally, bilateral filter is employed to smooth the image, which keeps the edges and highlight more details.
作者 邱祥松 李泽昇 吴志红 时宏伟 张严辞
机构地区 四川大学计算机学院 四川大学视觉合成图形图像技术国防重点学科实验室
出处 《计算机学报》 EI CSCD 北大核心 2014年第3期642-648,共7页 Chinese Journal of Computers
基金 国家自然科学基金(60903118) 国家科技支撑计划(2012BAH62F03)资助~~
关键词 环境遮挡 屏幕空间 圆盘采样 双边滤波 光线跟踪中图法 ambient occlusion screen space disk sampling bilateral filter ray trace
分类号 TP391 [自动化与计算机技术—计算机应用技术]
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二级参考文献14

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共引文献3

同被引文献15

  • 1赵祥,刘素红,唐义闵,于凯,李小文.BRDF模型参数分阶段鲁棒性反演方法[J].遥感学报,2006,10(6):901-909. 被引量：5
  • 2朱海军,吴华意,李德仁.基于DCT变换的GIS矢量数据压缩技术研究[J].武汉大学学报（信息科学版）,2007,32(12):1123-1126. 被引量：11
  • 3Mrndez-Feliu ,/., Sbert M. From obscurances to ambient occlu- sion: a survey[J]. The Visual Computer, 2009, 25(2): 181-196.
  • 4Tomasi C, Manduchi R. Bilateral filtering for gray and color images[C]//Proceedings of the 6th Intemational Conference on Computer Vision. Los Alamitos:IEEE Computer Society Press, 1998:839-846.
  • 5Bavoil L, Sainz M, Dimitrov R. Image-space horizon-based ambient occlusion[C]// Computer Graphics Proceedings, An- nual Conference Series, ACM SIGGRAPH. New York: ACM Press, 2008: Article No. 22.
  • 6McGuire M, Osman B, Bukowski M, et al. The alchemy screen-space ambient obscurance algorithm[C]// Computer Graphics Proceedings, Annual Conference Series, ACM SIGGRAPH. New York: ACM Press, 2011: 25-32.
  • 7Sichitiu M L, Veerarittiphan C. Simple, accurate time synchro- nization for wireless sensor networks [C]// Proceedings of IEEE Wireless Communication and Networking. Los Alamitos: IEEE Computer Society Press, 2003, 2:1266-1273.
  • 8Kontkanen J, Laine S. Ambient occlusion fields[C]//Proceed- ings of Symposium on Interactive 3D Graphics and Games. New York: ACM Press, 2005:41-48.
  • 9Shanmugam P, Arikan O. Hardware accelerated ambient occlu- sion techniques on GPUs[C]// Proceedings of Symposium on Interactive 3D Graphics and Games. New York: ACM Press, 2007:73-80.
  • 10Bavoil L, Sainz M. Multi-layer dual-resolution screen-space ambient occlusion[C]// Computer Graphics Proceedings, An- nual Conference Series, ACM SIGGRAPH. New York: ACM Press. 2009: Article No.45.

引证文献3

二级引证文献4

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2014年 第3期

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