专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO2007081869A2 FAST MULTIPLIERLESS INTEGER INVERTIBLE TRANSFORMS 审中-公开
标题翻译：快速多重整数可逆变换
公开(公告)号：WO2007081869A2
公开(公告)日：2007-07-19
申请号：PCT/US2007/000390
申请日：2007-01-05
申请人： FASTVDO LLC , TRAN, Trac, D. , LIU, Lijie , TOPIWALA, Pankaj, N.
发明人： TRAN, Trac, D. , LIU, Lijie , TOPIWALA, Pankaj, N.
IPC分类号： G06K9/36
CPC分类号： H04N19/42 , G06F17/147 , H04N19/45 , H04N19/61
摘要： 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.
摘要翻译：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。

IPRDB

热门服务

关于我们

友情链接

联系方式