中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

44 records (took 0.03 seconds)

    Method and apparatus for communicating compressed video using trellis coded QAM
    5.
    发明公开
    Method and apparatus for communicating compressed video using trellis coded QAM 失效
    使用网格编码的QAM传送压缩视频的方法和设备

    公开(公告)号：EP0524625A3

    公开(公告)日：1994-01-19

    申请号：EP92112592.8

    申请日：1992-07-23

    Applicant: GENERAL INSTRUMENT CORPORATION OF DELAWARE

    Inventor： Paik, Woo H. ,  Lery, Scott A. ,  Heegard, Chris ,  Krause, Edward A. ,  Heller, Jerrold A.

    IPC: H04N7/13 ,  H04L27/34 ,  H04N7/00

    CPC classification number: H04L1/0057 ,  H04L1/0071 ,  H04L27/3438 ,  H04N7/015 ,  H04N21/2383 ,  H04N21/4382

    Abstract: A method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and compensation (150) to provide DPCM data. For each block, one of PCM and DPCM data is selected for transmission based on a predetermined criteria. The selected data is compressed using the discrete cosine transform (133,134) to provide blocks of transform coefficients. The coefficients are quantized (135,136) to improve their coding efficiency and then variable length coded (138). The variable length coded coefficients are coded using a concatenated coding scheme with a Reed-Solomon outer code and trellis inner code to provide coded signals for transmission. The coded signals are transmitted using QAM.

    Abstract translation: 提供了一种用于传送高清晰度电视信号的方法和设备。 视频信号被分成PCM数据块。 使用运动估计和补偿（150）来处理PCM数据以提供DPCM数据。 对于每个块，PCM和DPCM数据中的一个被选择用于基于预定标准进行传输。 所选数据使用离散余弦变换（133,134）进行压缩以提供变换系数块。 量化系数（135,136）以提高其编码效率，然后进行可变长度编码（138）。 可变长度编码系数使用具有Reed-Solomon外部码和网格内部码的级联编码方案进行编码，以提供用于传输的编码信号。 编码信号使用QAM传输。

    Adaptive coding level control for video compression systems
    6.
    发明公开
    Adaptive coding level control for video compression systems 失效
    Niveauregelung in einem adaptiven Koderfürein Videokompressionssystem。

    公开(公告)号：EP0574724A2

    公开(公告)日：1993-12-22

    申请号：EP93108225.9

    申请日：1993-05-20

    Applicant: GENERAL INSTRUMENT CORPORATION OF DELAWARE

    Inventor： Paik, Woo H. ,  Krause, Edward A. ,  Liu, Vincent

    IPC: H04N7/13

    CPC classification number: H04N19/102 ,  H04N19/10 ,  H04N19/103 ,  H04N19/124 ,  H04N19/14 ,  H04N19/146 ,  H04N19/15 ,  H04N19/176 ,  H04N19/192 ,  H04N19/30 ,  H04N19/39 ,  H04N19/50 ,  H04N19/60 ,  H04N19/61

    Abstract: An apparatus and method for adaptively compressing blocks of video image data provide a local coding level (34) for use in compressing successive blocks of video image data. Each block is preliminarily compressed (30) using a global coding level. The preliminarily compressed data is processed (32) to provide a measure of the randomness of an image area represented by the block of video image data. A local coding level is generated (34) based on the randomness measure. The video image data is then compressed (36) using the local coding level to provide compressed data for transmission. One or more intermediate compression stages (16, 18) can be provided, each generating an intermediate coding level (ICL), to better refine the randomness measure for use in generating the local coding level.

    Abstract translation: 用于自适应地压缩视频图像数据块的装置和方法提供用于压缩视频图像数据的连续块的本地编码级（34）。 使用全局编码级别预先压缩（30）每个块。 处理预先压缩的数据（32）以提供由视频图像数据块表示的图像区域的随机性的度量。 基于随机度量产生局部编码级（34）。 然后使用本地编码级压缩视频图像数据（36），以提供用于传输的压缩数据。 可以提供一个或多个中间压缩级（16,18），每个中间压缩级（16,18）生成中间编码级（ICL），以更好地改进用于产生本地编码级的随机度量。

    Method and apparatus for vector coding of video transform coefficients
    10.
    发明公开
    Method and apparatus for vector coding of video transform coefficients 失效
    视频变换系数矢量编码的方法与装置

    公开(公告)号：EP0562420A3

    公开(公告)日：1994-06-01

    申请号：EP93104283.2

    申请日：1993-03-16

    Applicant: GENERAL INSTRUMENT CORPORATION OF DELAWARE

    Inventor： Krause, Edward A. ,  Tom, Adam ,  Liu, Vincent

    IPC: H04N7/133

    CPC classification number: G06T9/008 ,  H04N19/124 ,  H04N19/13 ,  H04N19/132 ,  H04N19/60 ,  H04N19/91

    Abstract: A vector coding scheme for video transform coefficients is provided. A vector is generated to identify a group of coefficients from a block of transform coefficients that qualify for transmission according to predetermined criteria. In an illustrated embodiment, only coefficients having nonzero amplitudes are transmitted. The vector is encoded to provide a vector code word for transmission. The coefficients from the group qualifying for transmission are encoded to provide coefficient code words for transmission. The vector code word correlates the coefficient code words to coefficient locations in the block. In a preferred embodiment, the block is divided into a plurality of regions containing subsets of coefficients. A separate vector is transmitted for each region, correlating the coefficient code words to coefficient locations in the corresponding region of the block.

Patent Agency Ranking