基于共轭透视相关相机的光场图像渲染与显示  

Rendering and Display of Light Field Images Using Conjugate Perspective Coherence Cameras

作　　者：周梦滔 楼益民 胡娟梅 冯玉顺 吴锋民 ZHOU Mengtao;LOU Yimin;HU Juanmei;FENG Yushun;WU Fengmin(Key Laboratory of Optical Field Manipulation of Zhejiang Province,Department of Physics,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学物理系浙江省光场调控技术重点实验室,杭州310018

出　　处：《光子学报》2023年第4期85-94,共10页Acta Photonica Sinica

基　　金：浙江省自然科学基金(Nos.LTY22F020002,LY19F050018);浙江理工大学科研启动项目(No.17062061-Y)。

摘　　要：为提升光场图像的渲染效率,提出一种基于共轭透视相关相机的光场图像渲染算法并搭建了相应的光场显示系统。利用共轭透视相机实现了深度正确的光场图像的一步渲染,从而省去了图像编码过程。同时利用相邻共轭相机之间的透视相关性减少重复计算,加速了渲染过程。对比传统算法,该算法并行处理能力强,非常适合利用图形处理硬件进行加速处理。利用中央处理器和图形处理器混合编程技术搭建了获取光场图像的渲染管线。对比测试结果表明,算法对视点数目不敏感,尤其适合高密度视点的光场图像的渲染。而且所渲染的视点越多,效率提升越明显。该算法还可以有效地兼容计算机图形学中的纹理贴图、光照等技术实现逼真场景的渲染。为验证算法的正确性,搭建了一套光场显示系统,利用所渲染的光场图像实现了虚拟场景的3D显示,获得了良好的3D立体效果。Light field display is an important true Three-dimensional(3D)display technology.It can provide the observers with rich 3D perception such as binocular parallax,motion parallax,monocular focusing,and so on.Light field display technology has a wide range of applications in various fields such as industrial and agricultural production,daily life,military defense,game and entertainment.It is a platform technology,so it has attracted much attention.High-quality light field display requires a large amount of light field image information.How to quickly acquire light field image information is still an important challenge in this field.The light field information acquisition technique mainly includes two categories one is optical acquisition technique and the other is digital rendering method.Optical acquisition technique can capture light field information of real scenes,but the acquisition system is complex and requires precise calibration.The digital rendering method uses computer technique to generate light field images.It can be combined with computer graphics technology to render special artistic effects flexibly.Model-based Rendering(MBR)and Image-based Rendering(IBR)are two typical digital rendering methods.The MBR method can get high-quality light field images,but the rendering efficiency needs to be improved.The IBR method renders faster,but the image quality needs to be enhanced.Both of these methods suffer from the pseudoscopic problem of 3D images.In order to improve the rendering efficiency and quality of light field images,a rendering algorithm of light field image and display system based on conjugate perspective coherence camera are proposed.The algorithm is called Conjugate Multiple Viewpoint Rendering(CMVR).The depth mapping relationship between a normal perspective camera and a conjugate perspective camera is analyzed.The conjugate perspective cameras are constructed and used to render the light field images without pseudoscopic problem in one step.Therefore,the image encoding process is avoided.At

关 键 词：光场显示 光场图像 透视相关性 渲染管线 计算机图形学 

分 类 号：O436[机械工程—光学工程]