一种后处理式的改进抗锯齿算法  

Improved Anti-aliasing Algorithm Based on Deferred Shading

作　　者：邵鹏[1] 周伟 李光泉[1] 吴志健[2] SHAO Peng;ZHOU Wei;LI Guang-quan;WU Zhi-jian(School of Computer and Information Engineering,Jiangxi Agricultural University,Nanchang 330045,China;School of Computer,Wuhan University,Wuhan 430072,China)

机构地区：[1]江西农业大学计算机与信息工程学院,南昌330045 [2]武汉大学计算机学院,武汉430072

出　　处：《计算机科学》2018年第B11期218-221,225,共5页Computer Science

基　　金：国家自然科学基金(70971043;61763019);江西省教育厅科技项目(GJJ160409;GJJ161076)资助

摘　　要：FXAA算法是一种后处理式的抗锯齿算法,由于它是基于图像像素的边缘检测算法,在很多情况下边缘检测的不准确会造成许多不必要的抗锯齿计算,导致图像过度模糊。为了提高抗锯齿的性能,提出了一种基于FXAA算法的改进抗锯齿算法(IAAFXAA)。该算法将相对视点的深度和法线保存到纹理中,当使用深度和法线信息时从G-buffer中提取。该算法能利用深度、法线信息进行较为精确的边缘检测。大量的实验结果与分析表明,该算法在保证抗锯齿效果的同时,能更加精确地确定抗锯齿区域,生成高质量的边界,避免图像的过度模糊,提升图像质量。FXAA is a post-processing anti-aliasing algorithm.Because it is an edge detection algorithm based on image pixel,it causes a lot of unnecessary anti-aliasing computation.In order to improve the performance of anti-aliasing,an improved anti-aliasing algorithm based on FXAA(IAAFXAA)was proposed.The depth and normal of the relative view are saved into the texture.The algorithm extracts depth and normal information from G-buffer,and uses depth and normal information to perform more accurate edge detection.A large number of experimental results and analysis show that while ensuring the good anti-aliasing effect,the proposed algorithm can determine the anti-aliasing region more accurately to generate high-quality boundaries,and avoid excessive blurring of images to improve image quality.

关 键 词：延迟渲染 G-Buffer 抗锯齿 边缘检测 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]