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1. 发明授权

US06944226B1 System and associated method for transcoding discrete cosine transform coded signals 失效
标题翻译：用于对离散余弦变换编码信号进行代码转换的系统和相关方法
公开(公告)号：US06944226B1
公开(公告)日：2005-09-13
申请号：US09677901
申请日：2000-10-03
申请人： Wanrong Lin , Dennis Bushmitch , David Alan Braun , Raghuraman Mudumbai , Yao Wang
发明人： Wanrong Lin , Dennis Bushmitch , David Alan Braun , Raghuraman Mudumbai , Yao Wang
IPC分类号： H04N7/30 , H03M7/30 , H03M7/40 , H04N7/26 , H04N7/12
CPC分类号： H04N19/40
摘要： A method is provided for transcoding between video signals in two standards, DV and MPEG-2, each standard including discrete cosine transform (DCT) compressed signals. The each of the signals have macroblocks containing a plurality of DCT blocks. The DCT blocks are quantized according to respective quantization methods defined by the standards. The coefficients in each block are zigzag scanned, run-length coded and variable-length coded. The process variable-length decodes the coefficients and translates the quantized coefficients in the DV standard into quantized coefficients in the MPEG standard without fully dequantizing at least some of the DV coefficients and without performing an inverse DCT operation on any of the DCT coefficients. DV blocks that are encoded in a 248 format are translated into an 88 format before they are converted to MPEG-2 blocks. A method for transcoding from MPEG-2 to DV is also described. The MPEG-2 signals are intra-frame encoded, have a 4:2:2 chrominance format and an 88 frame-encoded block format. According to this method, converted 88 DV blocks that represent significant intra-field motion are converted from the 88 format to a 248 format. The method also controls which overflow coefficients in the DV signal are transcoded into corresponding coefficients in the MPEG-2 signal to control the data rate of the MPEG-2 signal.
摘要翻译：提供了一种用于在两个标准DV和MPEG-2的视频信号之间进行代码转换的方法，每个标准包括离散余弦变换（DCT）压缩信号。每个信号具有包含多个DCT块的宏块。根据标准定义的各种量化方法对DCT块进行量化。每个块中的系数被锯齿扫描，游程长度编码和可变长度编码。过程可变长度解码系数并将DV标准中的量化系数转换为MPEG标准中的量化系数，而不对DV系数中的至少一些进行完全去量化，并且不对任何DCT系数执行逆DCT操作。以248格式编码的DV块在转换为MPEG-2块之前被转换为88格式。还描述了从MPEG-2转换为DV的方法。 MPEG-2信号被帧内编码，具有4：2：2色度格式和88帧编码块格式。根据这种方法，表示重要的场内运动的转换的88个DV块被从88格式转换成248格式。该方法还控制DV信号中的溢出系数被转码为MPEG-2信号中的相应系数，以控制MPEG-2信号的数据速率。

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