多标准可配置的视频编码亚像素插值结构

针对视频编码中存在的各种不同的亚像素插值方法,提出了一种支持多种标准的可配置插值结构.该结构采用2个独立的8阶插值滤波器,每个滤波器配置一个独立参数寄存器,可灵活配置任意1/4像素位置的滤波系数,从而实现对各种亚像素插值方法的支持.2个滤波器采用两步法策略进行插值,可以减少约46%的计算量.采用SMIC 0.13μm CMOS标准单元工艺对该结构进行综合,其工作频率可以达到 400MHz,面积约为32.6k门.实验结果显示,该滤波结构工作在250MHz时,可满足1920×1080、30fps的高清视频应用的实时插值计算.

A Multi-standard Configurable Sub-pixel Interpolation Architecture for Video Encoding

Various sub-pixel interpolation technologies are adopted in video coding applications. A multi-standard configuration interpolation architecture is proposed. It consists of two independent 8-tap filters. It can also reduce about 46% interpolation computation by a two-step filter method. Each filter includes a filter parameter register, which stores different filter parameter for various video standards. As a pipeline architecture, filter can have three filter results in one cycle. In SMIC 0.13μm CMOS process, the frequency of this architecture is up to 400MHz, and the area is about 32.6k gates. The experiment results show that, working on 250MHz, this architecture can satisfy the interpolation computation requirements of encoding 1920×1080,30fps HD video sequences.