Pixel History Linear Models for Real-Time Temporal Filtering

作     者：Iglesias-Guitian, Jose A. Moon, Bochang Koniaris, Charalampos Smolikowski, Eric Mitchell, Kenny 

作者机构：Disney Res Zurich Switzerland Walt Disney Imagineering Glendale CA USA 

出 版 物：《COMPUTER GRAPHICS FORUM》 (计算机图形学论坛)

年 卷 期：2016年第35卷第7期

页      面：363-372页

核心收录：

学科分类：08[工学] 0835[工学-软件工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：Categories and Subject Descriptors (according to ACM CCS) I.4.3 [Computer Graphics]: Enhancement&mdash Filtering I.3.3 [Computer Graphics]: Picture/Image Generation&mdash Antialiasing 

摘      要：We propose a new real-time temporal filtering and antialiasing (AA) method for rasterization graphics pipelines. Our method is based on Pixel History Linear Models (PHLM), a new concept for modeling the history of pixel shading values over time using linear models. Based on PHLM, our method can predict per-pixel variations of the shading function between consecutive frames. This combines temporal reprojection with per-pixel shading predictions in order to provide temporally coherent shading, even in the presence of very noisy input images. Our method can address both spatial and temporal aliasing problems under a unique filtering framework that minimizes filtering error through a recursive least squares algorithm. We demonstrate our method working with a commercial deferred shading engine for rasterization and with our own OpenGL deferred shading renderer. We have implemented our method in GPU and it has shown significant reduction of temporal flicker in very challenging scenarios including foliage rendering, complex non-linear camera motions, dynamic lighting, reflections, shadows and fine geometric details. Our approach, based on PHLM, avoids the creation of visible ghosting artifacts and it reduces the filtering overblur characteristic of temporal deflickering methods. At the same time, the results are comparable to state-of-the-art realtime filters in terms of temporal coherence.