一种高效的H.264反变换反量化结构设计

摘要

在分析H.264反变换反量化算法的基础上，提出了一种高效的H.264反变换反量化硬件结构.在反变换中，采用了一个可重构的一维IDCT变换结构；在反量化中，采用了4个反量化单元的并行结构，并通过LUT取代了占用电路面积大的模运算和除法运算；在整体结构设计中，采用了门控时钟方案和流水线技术.结果表明，本设计可提高系统输出能力和降低硬件功耗，并满足1080i高清码流实时解码的要求.%This paper analyzes the algorithm of Inverse Transform and Quantization(ITIQ) in H.264 and proposes a high performance architecture. A reconfigurable one dimensional IDCT (Inverse Discrete Cosine Transform) architecture of Inverse Transform is proposed; A 4-IQ-parallel architecture of Inverse Quantization is adopted, area-consuming MODULO and DIVISION operation of Inverse Quantization are implemented by LUTs instead of direct computation. Unified clock gating scheme and pipeline technology are also used in the design. The results show that the design increases the system throughput and drops the power consumption and meets the real-time decoding of 1080i stream.