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    • 7. 发明授权
    • Single-instruction multiple-data (SIMD)-based algorithms for processing video data
    • 用于处理视频数据的单指令多数据(SIMD)算法
    • US07174047B2
    • 2007-02-06
    • US10112568
    • 2002-03-29
    • Wanrong LinAnton MargolineDennis Bushmitch
    • Wanrong LinAnton MargolineDennis Bushmitch
    • G06K9/46
    • G06F17/147
    • In a video encoder/decoder, a method processes a discrete cosine transform (DCT) block of coefficients. The method receives a DCT block of coefficients, and linearizes the DCT block of coefficients into a one dimensional array of sequentially arranged coefficients. The method stores a portion of the one dimensional array of coefficients in a register, the portion including at least two sequentially arranged coefficients. The stored portion of coefficients in the register is processed. A next portion of coefficients in the one dimensional array is processed. This is repeated until the entire DCT block of coefficients have been loaded into the register. The processing may include computing a run length value, finding a class number, or determining dequantized coefficients of a DCT block.
    • 在视频编码器/解码器中,一种处理系数的离散余弦变换(DCT)块的方法。 该方法接收系数的DCT块,并将系数的DCT块线性化为顺序排列的系数的一维阵列。 该方法将一维系数系列阵列的一部分存储在寄存器中,该部分包括至少两个顺序排列的系数。 处理寄存器中存储的系数部分。 处理一维阵列中的系数的下一部分。 这是重复的,直到系统的整个DCT块被加载到寄存器中。 处理可以包括计算游程长度值,找到类号,或者确定DCT块的去量化系数。
    • 9. 发明授权
    • System and associated method for transcoding discrete cosine transform coded signals
    • 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
    • US06944226B1
    • 2005-09-13
    • US09677901
    • 2000-10-03
    • Wanrong LinDennis BushmitchDavid Alan BraunRaghuraman MudumbaiYao Wang
    • Wanrong LinDennis BushmitchDavid Alan BraunRaghuraman MudumbaiYao Wang
    • H04N7/30H03M7/30H03M7/40H04N7/26H04N7/12
    • H04N19/40
    • 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.
    • 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。