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公开(公告)号：CA2579718C
公开(公告)日：2016-05-10
申请号：CA2579718
申请日：2005-06-08
Applicant: CISCO TECH INC
Inventor： CHEN WEN-HSIUNG , WU FANG , PELTON GREGORY D , TOEBES JOHN A , ROSENFELD DOV
Abstract: A method for variable length coding an ordered series of digital signals, e.g., of quantized transform coefficients of a block of image data with a most likely-to-occur amplitude, e.g., 0, and at least one other amplitude, e.g., 1, to form a set of codewords. The method includes establishing a breakpoint along the ordering to define a first contiguous region and a second contiguous region, such that clusters of consecutive signals of any value other than the most likely-to-occur value occur mostly in the first contiguous region. The method includes encoding the signals in the first region using a first region encoding method suitable for encoding clusters; and encoding the signals in the second region using a second region encoding method. The first region and second region encoding methods include variable length codes such that relatively short codewords are formed to represent relatively more likely-to-occur sequences.
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Patent Agency Ranking
公开(公告)号：AU2004240453B2
公开(公告)日：2007-02-08
申请号：AU2004240453
申请日：2004-03-03
Applicant: CISCO TECH INC
Inventor： PELTON GREGORY D , CHEN WEN-HSIUNG , WU FANG
Abstract: A method and an apparatus to encode a series of quantized coefficients of a transform of a block of image data. The method includes forming modes for each encountered non-zero amplitude and forming events for the modes in the mode-modified series formed by setting to zero all non-zero amplitudes other than the amplitude defining the mode. An event for modes for amplitudes greater than 1 is a run of none or more zero-valued coefficients followed a non-zero amplitude in the mode-modified series. A first mode is defined for amplitude 1 wherein an event is a run of none or more zero-valued coefficients followed the amplitude 1 coefficient in the mode-modified series. In another embodiment, a first mode is defined for amplitude 1 wherein an event is a run in the mode-modified series of none or more zero-valued coefficients followed by a run of one of a predefined set of sequences, each sequence in the set being a sequence of l's and 0's starting with a coefficient of amplitude 1.
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公开(公告)号：CA2579718A1
公开(公告)日：2006-01-05
申请号：CA2579718
申请日：2005-06-08
Applicant: CISCO TECH INC
Inventor： WU FANG , PELTON GREGORY D , CHEN WEN-HSIUNG , ROSENFELD DOV , TOEBES JOHN A
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公开(公告)号：CA2520652C
公开(公告)日：2016-06-07
申请号：CA2520652
申请日：2004-03-03
Applicant: CISCO TECH INC
Inventor： CHEN WEN-HSIUNG , WU FANG , PELTON GREGORY D
IPC: H04N19/18 , H03M7/40 , H04N7/26 , H04N7/30 , H04N7/32 , H04N7/50 , H04N19/124 , H04N19/61 , H04N19/64 , H04N19/91
Abstract: A method and an apparatus to encode a series of quantized coefficients of a transform of a block of image data. The transform is such that 0 is the most likely coefficient amplitude and 1 is the next most likely coefficient amplitude. The method includes forming modes for each encountered non-zero amplitude and forming events for the modes in the mode-~modified series formed by setting to zero all non-zero amplitudes other than the amplitude defining the mode. An event for modes for amplitudes greater than 1 is a run of none or more zero-valued coefficients followed a non-zero amplitude in the mode-modified series. In one embodiment, a first mode is defined for amplitude 1 wherein an event is a run of none or more zero-valued coefficients followed the amplitude 1 coefficient in the mode-modified series. In another embodiment, a first mode is defined for amplitude 1 wherein an event is a run in the mode-modified series of none or more zero-valued coefficients followed by a run of one of a predefined set of sequences, each sequence in the set being a sequence of l's and 0's starting with a coefficient of amplitude 1. In another embodiment, a first mode is defined for amplitude 1 wherein an event is a sequence of 0's and 1's of the length of the series of quantized coefficients. The method includes forming a codeword for each encountered mode and forming codewords for the formed events in the mode. Relatively short codewords are formed to represent events that are relatively more likely to occur.
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公开(公告)号：WO2006001994A3
公开(公告)日：2007-11-01
申请号：PCT/US2005020110
申请日：2005-06-08
Applicant: CISCO TECH INC , CHEN WEN-HSIUNG , WU FANG , PELTON GREGORY D , TOEBES JOHN A , ROSENFELD DOV
Inventor： CHEN WEN-HSIUNG , WU FANG , PELTON GREGORY D , TOEBES JOHN A , ROSENFELD DOV
Abstract: A method for variable length coding an ordered series of digital signals, e.g., of quantized transform coefficients of a block of image data with a most likely-to-occur amplitude, e.g., O, and at least one other amplitude, e.g., 1, to form a set of codewords. The method includes establishing a breakpoint (301) along the ordering to define a first contiguous region and a second contiguous region, such that clusters of consecutive signals of any value other than the most likely-to-occur value occur mostly in the first contiguous region. The method includes encoding the signals in the first region using a first region encoding method (303) suitable for encoding clusters; and encoding the signals in the second region using a second region encoding method (305). The first region and second region encoding methods include variable length codes such that relatively short codewords are formed to represent relatively more likely-to-occur sequences.
Abstract translation: 一种用于可变长度编码有序序列数字信号的方法，例如，具有最可能发生的幅度的图像数据块的量化变换系数，例如O，以及至少一个其它振幅，例如1， 以形成一组码字。 该方法包括沿着排序建立断点（301）以定义第一连续区域和第二连续区域，使得除了最可能出现的值之外的任何值的连续信号的群集主要出现在第一邻接区域 。 该方法包括使用适于编码簇的第一区域编码方法（303）对第一区域中的信号进行编码; 以及使用第二区域编码方法（305）对所述第二区域中的信号进行编码。 第一区域和第二区域编码方法包括可变长度代码，使得形成相对较短的码字以表示相对更可能发生的序列。
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公开(公告)号：EP1782337A4
公开(公告)日：2011-06-01
申请号：EP05759253
申请日：2005-06-08
Applicant: CISCO TECH INC
Inventor： CHEN WEN-HSIUNG , WU FANG , PELTON GREGORY D , TOEBES JOHN A , ROSENFELD DOV
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