公开(公告)号：WO1996033574A1

公开(公告)日：1996-10-24

申请号：PCT/US1996005311

申请日：1996-04-17

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： ADVANCED MICRO DEVICES, INC. ,  TUCKER, Michael, R. ,  STRONGIN, Geoffrey, S. ,  YI, Liu

IPC: H04N07/46

CPC classification number: H04N19/577

Abstract: A video decoder system, such as for use with MPEG video compression, uses a previous B-frame as an additional prediction source for the current B-frame, along with the past and future reference frames as defined by the MPEG specification. In one embodiment, a given macroblock within a current B-frame "N" reuses pixel values from the previous B-frame "N-1" if they are "similar enough" to the anticipated pixels which would otherwise need to be computed. For a given macroblock, motion vectors for both B-frames are compared: if they differ by less than a similarity threshold value, then the pixel values from the previous B-frame are reused without further computation. The similarity threshold may be adaptively adjusted to reduce the computational burden of video decompression, while affording a gradual degradation of picture quality, rather than wholesale skipping of entire frames.

Abstract translation: 视频解码器系统，例如用于MPEG视频压缩的视频解码器系统，使用先前的B帧作为当前B帧的附加预测源，以及由MPEG规范定义的过去和将来的参考帧。 在一个实施例中，当前B帧“N”中的给定宏块如果与预期的像素“足够相似”则重新使用来自先前B帧“N-1”的像素值，否则将需要计算。 对于给定的宏块，比较两个B帧的运动矢量：如果它们相差小于相似度阈值，则来自先前B帧的像素值被重新使用而不进一步计算。 可以自适应地调整相似性阈值，以减少视频解压缩的计算负担，同时提供图像质量的逐渐劣化，而不是批量跳过整个帧。

公开(公告)号：WO1996033575A1

公开(公告)日：1996-10-24

申请号：PCT/US1996005305

申请日：1996-04-17

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： ADVANCED MICRO DEVICES, INC. ,  TUCKER, Michael, R. ,  STRONGIN, Geoffrey, S. ,  YI, Liu

IPC: H04N07/50

CPC classification number: H04N19/433 ,  H04N19/423 ,  H04N19/61

Abstract: A video decoding system that selectively arranges video information within a memory to correspond to macroblocks of video information. Such a system advantageously increases the efficiency of processing video information when decoding compressed video information.

Abstract translation: 一种视频解码系统，其选择性地将视频信息布置在存储器内以对应于视频信息的宏块。 这样的系统有利地提高了解压缩视频信息时处理视频信息的效率。

公开(公告)号：WO1996033558A1

公开(公告)日：1996-10-24

申请号：PCT/US1996005414

申请日：1996-04-17

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： ADVANCED MICRO DEVICES, INC. ,  TUCKER, Michael, R. ,  STRONGIN, Geoffrey, S. ,  YI, Liu

IPC: H03M07/42

CPC classification number: H03M7/425 ,  H04N19/13 ,  H04N19/45 ,  H04N19/60 ,  H04N19/61 ,  H04N19/91

Abstract: A method and apparatus for decoding variable length code (VLC) data employ a hybrid technique of parsing short-length VLC codes using a binary tree or binary search procedure and parsing longer VLC codes using a table lookup procedure. This technique includes the steps of accessing a plurality of bits of coded bitstream data, bit testing a preselected number N first bits of the plurality of bitstream bits and determining whether the N first bits include a complete VLC code. If the N first bits include a complete VLC code, a VLC code is decoded in accordance with a result of the bit testing step. If the N first bits do not include a complete VLC code, a VLC code is decoded from a lookup table to a table element addressed by the bits of coded bitstream data.

Abstract translation: 用于解码可变长度码（VLC）数据的方法和装置采用使用二叉树或二进制搜索过程解析短长度VLC码并使用表查找过程解析较长VLC码的混合技术。 该技术包括以下步骤：访问编码比特流数据的多个比特，对多个比特流比特中的预先选择的N个第一比特进行比特测试，并确定N个第一比特是否包括完整的VLC码。 如果N个第一比特包括完整的VLC码，则根据比特测试步骤的结果对VLC码进行解码。 如果N个第一比特不包括完整的VLC码，VLC码将从查找表解码为由编码比特流数据的比特寻址的表格元素。

公开(公告)号：EP0821857B1

公开(公告)日：1999-09-01

申请号：EP96912840.4

申请日：1996-04-17

Applicant: Advanced Micro Devices, Inc.

Inventor： TUCKER, Michael, R. ,  STRONGIN, Geoffrey, S. ,  YI, Liu

IPC: H04N7/46

CPC classification number: H04N19/577

Abstract: A video decoder system, such as for use with MPEG video compression, uses a previous B-frame as an additional prediction source for the current B-frame, along with the past and future reference frames as defined by the MPEG specification. In one embodiment, a given macroblock within a current B-frame "N" reuses pixel values from the previous B-frame "N-1" if they are "similar enough" to the anticipated pixels which would otherwise need to be computed. For a given macroblock, motion vectors for both B-frames are compared: if they differ by less than a similarity threshold value, then the pixel values from the previous B-frame are reused without further computation. The similarity threshold may be adaptively adjusted to reduce the computational burden of video decompression, while affording a gradual degradation of picture quality, rather than wholesale skipping of entire frames.

公开(公告)号：EP0821857A1

公开(公告)日：1998-02-04

申请号：EP96912840.0

申请日：1996-04-17

Applicant: Advanced Micro Devices, Inc.

Inventor： TUCKER, Michael, R. ,  STRONGIN, Geoffrey, S. ,  YI, Liu

IPC: G06T9 ,  H04N7

CPC classification number: H04N19/577

Abstract: A video decoder system, such as for use with MPEG video compression, uses a previous B-frame as an additional prediction source for the current B-frame, along with the past and future reference frames as defined by the MPEG specification. In one embodiment, a given macroblock within a current B-frame 'N' reuses pixel values from the previous B-frame 'N-1' if they are 'similar enough' to the anticipated pixels which would otherwise need to be computed. For a given macroblock, motion vectors for both B-frames are compared: if they differ by less than a similarity threshold value, then the pixel values from the previous B-frame are reused without further computation. The similarity threshold may be adaptively adjusted to reduce the computational burden of video decompression, while affording a gradual degradation of picture quality, rather than wholesale skipping of entire frames.