基于流水的HEVC IDCT/IDST模块VLSI设计

Pipelined IDCT/IDST VLSI Architecture for HEVC

2013年1月HEVC(High Efficient Video Coding)被ITU-T和ISO/IEC正式确立为新一代视频编码国际标准.为了实现更高的压缩效率,HEVC使用了多项新技术.在空间域变换方面,HEVC支持从4×4到32×32的可变尺寸的IDCT变换,同时根据模式进行4×4IDCT和IDST变换的选择.由此提出了一种HEVC IDCT/IDST变换架构.采用基于流水的数据流调度策略和系数矩阵优化方案,提升了硬件效率和接口带宽利用率.采用65nm工艺库综合后,一维IDCT/IDST单元的等效门数约为40K,最高工作频率为500MHz,与现有设计相比可以实现30%以上的硬件资源减少和60%以上的吞吐率效率提升.仿真结果显示该结构可以实现对4k×2k@30f/s视频的IDCT/IDST处理.

The newest international video coding standard HEVC(High Efficiency Video Coding)is published by ITU-T and ISO/IEC in January,2013.To improve the compression efficiency,some new technologies have been adopted in HEVC.In spatial transform aspect,HEVC supports variable transform block sizes from 4×4 to 32×32 for IDCT as well as mode dependent 4×4IDST.In this paper,a novel IDCT/IDST architecture for HEVC is proposed.It uses pipelined data flow scheduling and coefficient matrix optimization to improve hardware efficiency and bandwidth utilization.Synthesized with 65 nm technology,the 1DIDCT/IDST is 40 K gate count and the maximum working frequency is 500 MHz.Compared with previous work,our architecture can get more than 30%reduction in hardware cost and 60% improvement in throughput efficiency.Experimental results show that it can deal with IDCT/IDST for 4k×2k@30f/s video sequence.