真实感体绘制中的光照与阴影模型算法研究
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摘要
真实感是三维重建中非常重要的因素,而绘制真实感模型需要进行光照与阴影的渲染。本文提出在局部光照组合模型的基础上采用基于光线遮挡的多层阴影地图的映射方法作为数据深度信息的增强处理。实验结果显示,此方法极大消除了边缘的锯齿现象,阴影效果柔和,与传统方法相比,算法运行时间少,速度快。本文算法在很大程度上改善了绘制质量,呈现更明显的立体效果,使绘制结果更接近于真实情况,并且计算量小,算法简单。
The sense of reality is a very important factor in the 3D reconstruction,and the drawing of the realistic model needs illumination and shadow tendering. A new local illumination model was proposed in this paper. On this basis,multi-layer shadow mapping method based on light shielding was submitted to enhance depth perception. The experimental results showed that this method greatly eliminates the aliasing phenomenon of the edge,and the shadow effect is soft. Companed with traditional algorithms,the algorithm we proposed improved the quality of drawing,and showed a more obvious three-dimensional effect. The result of rendering is closer to the real situation,the amount of calculation is small,and the algorithm is simple.
The sense of reality is a very important factor in the 3D reconstruction,and the drawing of the realistic model needs illumination and shadow tendering. A new local illumination model was proposed in this paper. On this basis,multi-layer shadow mapping method based on light shielding was submitted to enhance depth perception. The experimental results showed that this method greatly eliminates the aliasing phenomenon of the edge,and the shadow effect is soft. Companed with traditional algorithms,the algorithm we proposed improved the quality of drawing,and showed a more obvious three-dimensional effect. The result of rendering is closer to the real situation,the amount of calculation is small,and the algorithm is simple.
引文
[1]周志光.体数据特征的高效可视化方法研究[D].杭州:浙江大学,2012.
[2]杨乃,孔凡秋,杨鸿海,张百灵.基于空间认知的三维地图光影模型[J].测绘学报,2012,41(2):302-308.
[3]Genyuan Zhang,Jun Huang,Huabing Zhang,Xiaohua Li.The Overview of Many Light Rendering[J].International Symposium on Computers&Informatics,2015,1914-1921.
[4]Alessandro Dal Corso,Jeppe Revall Frisvad,Jesper Mosegaard,J.Andreas Brentzen.Interactive directional subsurface scattering and transport of mergent light[J].The Visual Computer,2016,1-13.
[5]任树成,周激流,何坤,夏建平.光照鲁棒的人脸识别[J].激光杂志,2009,30(5):35-37.
[6]鲁秋菊,郭天印,任民宏.基于离散余弦变换和主成分分析的光照条件人脸识别[J].激光杂志,2015,36(4):126-130.
[7]过洁,徐晓旸,潘金贵.基于阴影图的阴影生成算法研究现状[J].计算机辅助设计与图形学学报,2010,22(4):579-591.
[8]沈笠,杨宝光,冯结青.多层阴影图轮廓边背投软影算法[J].计算机辅助设计与图形学学报,2013,25(9):1265-1274.
[9]唐珂.基于多层深度图的软阴影生成算法[D].济南:山东大学,2013.
[10]Christoph Peters,Reinhard Kleiny.Moment Shadow Mapping[C].In proceedings of Proceedings of the 19th Meeting of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games,San Francisco,California,pages 7-14,ACM,2015.
[11]罗德宁.基于边缘拟合阴影图的实时硬阴影生成[J].四川大学学报(自然科学版),2013,50(2):1-2.
[12]谭同德,许绘香,赵红领,余晓霞.一种基于shadow mapping的阴影生成改进算法[J].计算机工程应用,2008,44(32):165-168.
[13]杜文俊,冯结青,杨宝光,沈笠.三角形重建的几何阴影图算法[J].计算机辅助设计与图形学学报,2016,28(2):208-217.
[14]邵延华,郭永彩,高潮.基于特征融合的人体引为识别[J].光电子·激光,2014,25(9):1818-1823.
[15]谢依妨,杨红雨.基于遮挡区间映射的软阴影的研究与实现[J].计算机工程与设计,2015,36(3):687-692.
[16]Hoshang Kolivand,Mohd Shahrizal Sunar,Ayman Altameem,Amjad Rehman and Mueen Uddin.Shadow Mapping Algorithms:Applications and Limitations[J].Appl.Math.Inf.Sci.2015,9(3),1307-1315.
[2]杨乃,孔凡秋,杨鸿海,张百灵.基于空间认知的三维地图光影模型[J].测绘学报,2012,41(2):302-308.
[3]Genyuan Zhang,Jun Huang,Huabing Zhang,Xiaohua Li.The Overview of Many Light Rendering[J].International Symposium on Computers&Informatics,2015,1914-1921.
[4]Alessandro Dal Corso,Jeppe Revall Frisvad,Jesper Mosegaard,J.Andreas Brentzen.Interactive directional subsurface scattering and transport of mergent light[J].The Visual Computer,2016,1-13.
[5]任树成,周激流,何坤,夏建平.光照鲁棒的人脸识别[J].激光杂志,2009,30(5):35-37.
[6]鲁秋菊,郭天印,任民宏.基于离散余弦变换和主成分分析的光照条件人脸识别[J].激光杂志,2015,36(4):126-130.
[7]过洁,徐晓旸,潘金贵.基于阴影图的阴影生成算法研究现状[J].计算机辅助设计与图形学学报,2010,22(4):579-591.
[8]沈笠,杨宝光,冯结青.多层阴影图轮廓边背投软影算法[J].计算机辅助设计与图形学学报,2013,25(9):1265-1274.
[9]唐珂.基于多层深度图的软阴影生成算法[D].济南:山东大学,2013.
[10]Christoph Peters,Reinhard Kleiny.Moment Shadow Mapping[C].In proceedings of Proceedings of the 19th Meeting of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games,San Francisco,California,pages 7-14,ACM,2015.
[11]罗德宁.基于边缘拟合阴影图的实时硬阴影生成[J].四川大学学报(自然科学版),2013,50(2):1-2.
[12]谭同德,许绘香,赵红领,余晓霞.一种基于shadow mapping的阴影生成改进算法[J].计算机工程应用,2008,44(32):165-168.
[13]杜文俊,冯结青,杨宝光,沈笠.三角形重建的几何阴影图算法[J].计算机辅助设计与图形学学报,2016,28(2):208-217.
[14]邵延华,郭永彩,高潮.基于特征融合的人体引为识别[J].光电子·激光,2014,25(9):1818-1823.
[15]谢依妨,杨红雨.基于遮挡区间映射的软阴影的研究与实现[J].计算机工程与设计,2015,36(3):687-692.
[16]Hoshang Kolivand,Mohd Shahrizal Sunar,Ayman Altameem,Amjad Rehman and Mueen Uddin.Shadow Mapping Algorithms:Applications and Limitations[J].Appl.Math.Inf.Sci.2015,9(3),1307-1315.