H264的整数变换存在8×8和4×4两种尺寸大小，这增加了硬件设计的复杂性。同时，高清视频应用要求解码器具有更强的处理能力。针对这两个问题，文章提出了一种高性能的反变换硬件实现结构。对于4×4整数反变换，重构一个8×8亚宏块的4个4×4块，从而使两种尺寸大小的整数反变换具有相同的结构。采用优化的数据存储和流水设计，行列反变换能够同时执行，处理一个8×8亚宏块平均只需要32个时钟周期。转置存储器采用一个32×32bits的双口SRAM和8组寄存器组实现，和以前的设计相比，可以节省537%的存储器面积。在108 MHz工作频率下，本文提出的硬件结构能够有效执行H264高清实时解码的反变换运算。

There are two kinds of integer transform in H264，8×8 integer transform and 4×4 integer transform This makes hardware design more complex At the same time, more powerful decoder is required for high definition video application High performance hardware architecture is proposed for 2D inverse integer transform in H264 For 4×4 inverse integer transform, four 4×4 blocks in an 8×8 sub-macroblock was reconstructed Therefore, the 8×8 2D inverse integer transform and 4×4 2D inverse integer transform could have the same architecture With a new strategy of data storage and pipeline, inverse transform for column data and inverse transform for row data could perform at the same time On average, 32 clocks were needed for processing an 8×8 sub-macroblock The transpose memory was composed of a two-port 32×32bits SRAM and 8 groups of registers Compared with former design, the new architecture could reduce 537% area of transpose memory When clocked at 108 MHz, the proposed design can perform real-time inverse transform for high definition video decoder of H264