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    • 2. 发明申请
    • FAST MULTIPLIERLESS INTEGER INVERTIBLE TRANSFORMS
    • 快速多重整数可逆变换
    • WO2007081869A2
    • 2007-07-19
    • PCT/US2007/000390
    • 2007-01-05
    • FASTVDO LLCTRAN, Trac, D.LIU, LijieTOPIWALA, Pankaj, N.
    • TRAN, Trac, D.LIU, LijieTOPIWALA, Pankaj, N.
    • G06K9/36
    • H04N19/42G06F17/147H04N19/45H04N19/61
    • This invention relates to the design and implementation of a large family of fast, efficient, hardware-friendly fixed-point multiplierless inverse discrete cosine transforms (IDCT) and the corresponding forward transform counterparts. All of the proposed structures comprises of butterflies and dyadic-rational lifting steps that can be implemented using only shift-and-add operations. The approach also allows the computational scalability with different accuracy-versus-complexity trade-offs. Furthermore, the lifting construction allows a simple construction of the corresponding multiplierless forward DCT, providing bit-exact reconstruction if properly pairing with our proposed IDCT. With appropriately-chosen parameters, all of the disclosed structures can easily pass IEEE-1180 test. The high-accuracy algorithm of the present invention is over 100 times more accurate than IEEE-1180 specifications, leading to practically drifting-free reconstruction in popular MPEG- 2 and MPEG-4 codecs even at the lowest quantization setting.
    • 本发明涉及一系列快速,高效,硬件友好的定点无乘法反相离散余弦变换(IDCT)和相应的正向变换对等体的设计与实现。 所有提出的结构都包括蝴蝶和二元合理的提升步骤,可以使用移位和加法操作来实现。 该方法还允许具有不同准确度与复杂度权衡的计算可扩展性。 此外,提升结构允许相应的无乘法正向DCT的简单构造,如果与我们提出的IDCT正确配对,则提供比特精确重构。 通过适当选择的参数,所有公开的结构都可以轻松通过IEEE-1180测试。 本发明的高精度算法比IEEE-1180规范精度高出100多倍,即使在最低的量化设置下也能在流行的MPEG-2和MPEG-4编解码器中实现无漂移重建。