公开(公告)号：US06658153B1

公开(公告)日：2003-12-02

申请号：US09038136

申请日：1998-03-11

申请人： Satoshi Nakagawa ,  Yasuko Matsumura ,  Takashi Nishi ,  Toshihisa Nakai

发明人： Satoshi Nakagawa ,  Yasuko Matsumura ,  Takashi Nishi ,  Toshihisa Nakai

IPC分类号： G06K946

CPC分类号： H04N19/89 ,  H04N19/13 ,  H04N19/61 ,  H04N19/91

摘要： When a segment of a compressively coded stream of moving-picture data is rendered unusable by an error, usable decoded data are discarded in a range adjacent to the unusable segment, to avoid picture defects that might result from the use of incorrectly decoded data. The discarding range may extend from one end or from both ends of the unusable segment. When the data are coded in two or more different modes, two or more corresponding ranges of different lengths may be set.

摘要翻译： 当运动图像数据的压缩编码流的片段由于错误而不可用时，可用解码数据在与不可用片段相邻的范围内被丢弃，以避免由于使用不正确解码的数据可能导致的图像缺陷。 丢弃范围可以从不可用段的一端或两端延伸。 当数据以两种或更多种不同的模式进行编码时，可以设定不同长度的两个或多个对应的范围。

公开(公告)号：US06456664B1

公开(公告)日：2002-09-24

申请号：US09272209

申请日：1999-03-19

申请人： Yasuko Matsumura ,  Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Yasuko Matsumura ,  Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： H04N712

CPC分类号： H04N19/107 ,  H04N19/139 ,  H04N19/176 ,  H04N19/61

摘要： Each of consecutively transmitted frames representing motion images is composed of a given number of blocks. A SAD cumulative value representing an image variation history is derived per block. Blocks to be refreshed, i.e. to be intraframe-coded, are selected based on the SAD cumulative values. Specifically, a given number of the blocks whose corresponding SAD cumulative values are larger among all the SAD cumulative values are selected, or those blocks whose corresponding SAD cumulative values are greater than a threshold value are selected. Thus, the blocks which actually require “refresh” can be preferentially refreshed.

摘要翻译： 表示运动图像的连续发送的帧中的每一个由给定数量的块组成。 每个块导出表示图像变化历史的SAD累积值。 基于SAD累积值来选择要刷新的块，即被帧内编码的块。 具体地说，选择所有SAD累积值中对应的SAD累积值较大的给定数量的块，或者选择其对应的SAD累积值大于阈值的那些块。 因此，可以优先刷新实际需要“刷新”的块。

公开(公告)号：US06185717B2

公开(公告)日：2001-02-06

申请号：US09173548

申请日：1998-10-16

申请人： Shigeru Fukunaga ,  Yasuko Matsumura ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Yasuko Matsumura ,  Toshihisa Nakai

IPC分类号： H03M1300

CPC分类号： H03M13/33 ,  H03M13/19

摘要： A data reception unit having improved robustness against synchronization code errors. In data transmission, the synchronization code is always located in the headers of coded data contained in the package payload. Where the number of synchronization code bit errors falls below a threshold value, decoding is performed ignoring the errors. Where the number of bit errors exceeds the threshold value, the encoded data in the packet is discarded. Robustness against errors are modified through manipulation of the threshold value in response to transmission path type and error status.

摘要翻译： 一种数据接收单元，具有改善的抗同步码错误的鲁棒性。 在数据传输中，同步码始终位于包装有效载荷中包含的编码数据的标题中。 在同步码比特错误的数量低于阈值的情况下，进行解码而忽略该错误。 在位错误数超过阈值的情况下，数据包中的编码数据被丢弃。 通过根据传输路径类型和错误状态操纵阈值来修改对错误的鲁棒性。

公开(公告)号：US6125144A

公开(公告)日：2000-09-26

申请号：US924262

申请日：1997-09-05

申请人： Yasuko Matsumura ,  Toshihisa Nakai

发明人： Yasuko Matsumura ,  Toshihisa Nakai

IPC分类号： H04N19/50 ,  G06T9/00 ,  H03M7/30 ,  H03M7/36 ,  H04N19/103 ,  H04N19/107 ,  H04N19/119 ,  H04N19/126 ,  H04N19/139 ,  H04N19/15 ,  H04N19/167 ,  H04N19/174 ,  H04N19/176 ,  H04N19/189 ,  H04N19/196 ,  H04N19/423 ,  H04N19/46 ,  H04N19/503 ,  H04N19/51 ,  H04N19/57 ,  H04N19/593 ,  H04N19/61 ,  H04N19/625 ,  H04N19/65 ,  H04N19/70 ,  H04N19/85 ,  H04N19/91 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04

CPC分类号： H04N19/107 ,  H04N19/61

摘要： A picture coder and a picture coding method which quickly recover the degraded picture quality of partitions, which could not be decoded due to a data error or a data loss, without increasing the amount of coding. A picture coding method or a picture coder is operable for coding picture data of a frame which is divided into a plurality of partitions, each partition being coded in a temporal correlation coding method or in an intra-picture coding method, wherein one or more partitions are determined to be refreshed for each frame or for each plurality of frames and wherein partitions determined to be refreshed are coded in the intra-picture coding method. A temporal change amount for each partition is calculated and, based on the temporal change amount for each partition, one or more partitions are determined to be refreshed.

摘要翻译： 一种图像编码器和图像编码方法，其在不增加编码量的情况下快速恢复由于数据错误或数据丢失而不能被解码的分区的劣化图像质量。 图像编码方法或图像编码器可操作用于编码划分成多个分区的帧的图像数据，每个分区以时间相关编码方法或图像内编码方法编码，其中一个或多个分区 被确定为每帧或每个多个帧被刷新，并且其中被确定为刷新的分区被编码在图像内编码方法中。 计算每个分区的时间变化量，并且基于每个分区的时间变化量确定一个或多个分区被刷新。

公开(公告)号：US5847763A

公开(公告)日：1998-12-08

申请号：US678624

申请日：1996-07-10

申请人： Yasuko Matsumura ,  Toshihisa Nakai

发明人： Yasuko Matsumura ,  Toshihisa Nakai

IPC分类号： H03M13/00 ,  H04N7/173 ,  H04N7/24 ,  H04N19/00 ,  H04N19/102 ,  H04N19/164 ,  H04N19/172 ,  H04N19/186 ,  H04N19/196 ,  H04N19/423 ,  H04N19/50 ,  H04N19/57 ,  H04N19/625 ,  H04N19/65 ,  H04N19/67 ,  H04N19/68 ,  H04N19/89 ,  H04N19/91 ,  H04N21/2383 ,  H04N21/4425 ,  H04N21/6379 ,  H04N7/32

CPC分类号： H04N21/658 ,  H04N19/00 ,  H04N19/166 ,  H04N19/17 ,  H04N19/174 ,  H04N19/176 ,  H04N19/61 ,  H04N19/89 ,  H04N21/6377 ,  H04N19/107 ,  H04N19/70

摘要： A moving picture transmission system enhances the quality of a demand-refreshed image without increasing the amount of code to be transmitted. When a picture data error has been detected, a reception side coder transmits to a transmission side decoder information concerning the location of the error detected in a picture frame. Upon receipt of this information, for several frames, beginning with the picture frame that is distorted by the error and continuing up until the picture frame preceding the frame to be transmitted, the transmission side determines a portion that may be distorted by the occurrence of the error or by the transmission of the error, and a picture portion that may be affected by distortion when picture data are to be coded in the inter-frame coding mode. Only the picture portion that the transmission side determines will be affected is forcibly coded in the intra-frame coding picture mode, the other picture portions being coded in the normal manner, and the resultant picture data are transmitted to the reception side.

摘要翻译： 运动图像传输系统增强了需求刷新图像的质量，而不增加要发送的代码量。 当检测到图像数据错误时，接收侧编码器向发送侧解码器发送关于在图像帧中检测到的错误的位置的信息。 在接收到该信息时，对于由错误失真的图像帧开始并持续到直到要发送的帧之前的图像帧为止的几帧，发送侧确定可能由于发生的帧而发生失真的部分 错误或错误的发送，以及当以帧间编码模式对图像数据进行编码时可能受失真影响的图像部分。 在帧内编码图像模式中仅强制地对发送侧确定的图像部分进行影响，其他图像部分以正常方式进行编码，并将所得到的图像数据发送到接收侧。

公开(公告)号：US06489996B1

公开(公告)日：2002-12-03

申请号：US09401276

申请日：1999-09-23

申请人： Yasuko Matsumura ,  Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Yasuko Matsumura ,  Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： H04N718

CPC分类号： H04N19/895 ,  H04N19/51

摘要： A moving picture coded by inter-frame coding, with motion compensation, is decoded by an apparatus that stores at least two previously decoded frames, together with information identifying any erroneous parts of the previously decoded frames. The current frame is decoded with reference to a predicted frame assembled from decodable parts of the previous frames. When a motion vector points to a non-decodable part of a previous frame, it is extended farther back to a decodable part of an earlier frame. The extension can be made linearly, or by using previous motion vectors. Picture distortion caused by error propagation is thereby reduced.

摘要翻译： 通过具有运动补偿的帧间编码编码的运动图像由存储至少两个先前解码的帧的装置以及识别先前解码的帧的任何错误部分的信息来解码。 参考从先前帧的可解码部分组装的预测帧对当前帧进行解码。 当运动矢量指向前一帧的不可解码部分时，它将被延伸回更早的帧的可解码部分。 扩展可以线性化，也可以使用先前的运动矢量。 从而减少由误差传播引起的图像失真。

公开(公告)号：US5835144A

公开(公告)日：1998-11-10

申请号：US535920

申请日：1995-09-28

申请人： Yasuko Matsumura ,  Toshihisa Nakai

发明人： Yasuko Matsumura ,  Toshihisa Nakai

IPC分类号： G06T9/00 ,  H03M7/14 ,  H03M7/40 ,  H03M13/00 ,  H04L7/04 ,  H04N1/41 ,  H04N7/62 ,  H04N19/00 ,  H04N19/102 ,  H04N19/166 ,  H04N19/176 ,  H04N19/189 ,  H04N19/196 ,  H04N19/423 ,  H04N19/46 ,  H04N19/503 ,  H04N19/51 ,  H04N19/61 ,  H04N19/625 ,  H04N19/67 ,  H04N19/68 ,  H04N19/70 ,  H04N19/85 ,  H04N19/91 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04

CPC分类号： H04L7/04 ,  H04N19/463 ,  H04N19/61 ,  H04N19/65 ,  H04N19/89 ,  H04N19/13 ,  H04N19/91

摘要： A coded moving-picture signal consists of segments, each having a start code, header information, and coded picture data. The picture data are coded according to a self-resynchronizing variable-length coding rule. During decoding, if an error is recognized, this coding rule is applied in order to resynchronize; the coded data from the resynchronization point up to the next start code are stored in a memory; then the memory contents are decoded. According to a first aspect of the invention, the header information is coded according to the same variable-length coding rule, except for group header information appearing immediately after the start code. According to a second aspect of the invention, the start code is followed by all the header information in the segment, then by all the coded picture data in the segment.

摘要翻译： 编码运动图像信号由具有起始码，头信息和编码图像数据的段组成。 图像数据根据自同步可变长度编码规则进行编码。 在解码期间，如果识别错误，则应用该编码规则以便重新同步; 从再同步点到下一个起始码的编码数据被存储在存储器中; 则存储器内容被解码。 根据本发明的第一方面，标题信息根据相同的可变长度编码规则被编码，除了在起始码之后立即出现的组标题信息。 根据本发明的第二方面，起始码之后是段中的所有标题信息，然后是片段中的所有编码图像数据。

公开(公告)号：US06973132B2

公开(公告)日：2005-12-06

申请号：US09963556

申请日：2001-09-27

申请人： Noriyuki Sato ,  Toshihisa Nakai

发明人： Noriyuki Sato ,  Toshihisa Nakai

IPC分类号： H04N7/173 ,  H04N19/00 ,  H04N19/12 ,  H04N19/159 ,  H04N19/196 ,  H04N19/463 ,  H04N19/65 ,  H04N19/70 ,  H04N19/85 ,  H04N21/426 ,  H04N21/4425 ,  H04N21/6437 ,  H04N7/12

CPC分类号： H04N21/6437

摘要： A transmission header compressor and a moving-picture encoder each include a respective circuit for synchronizing a timing at which the compressor inhibits compression of transmission headers with a timing at which the encoder executes intra-frame coding. A moving-picture transmission system including the compressor and encoder is also disclosed.

摘要翻译： 发送报头压缩器和运动图像编码器各自包括用于使压缩器禁止发送报头的压缩的定时与编码器执行帧内编码的定时同步的各自的电路。 还公开了包括压缩器和编码器的运动图像传输系统。

公开(公告)号：US06683988B1

公开(公告)日：2004-01-27

申请号：US09412322

申请日：1999-10-05

申请人： Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： G06K936

CPC分类号： H04N21/6379 ,  G06T9/004 ,  H04N7/17318 ,  H04N21/4382 ,  H04N21/44209 ,  H04N21/6377 ,  H04N21/658

摘要： In a picture transmission system that transmits a series of pictures from a coding apparatus to a decoding apparatus, each picture being coded and decoded with reference to a preceding picture, when a transmission error occurs, the decoding apparatus detects a decoding error caused by the transmission error and sends an error signal to the coding apparatus. The coding apparatus and decoding apparatus then both modify part of a reference picture affected by the decoding error, making identical modifications. A subsequent picture is coded and decoded with reference to the modified reference picture, thereby recovering from the transmission error with minimum loss of coding efficiency and picture quality.

摘要翻译： 在从编码装置发送一系列图像到解码装置的图像传输系统中，每个图像参照前面的图像被编码和解码，当发生传输错误时，解码装置检测由传输引起的解码错误 并向编码装置发送错误信号。 然后，编码装置和解码装置都对由解码错误影响的参考图像的一部分进行修改，进行相同的修改。 参照修改后的参照图像对后续图像进行编码和解码，由此以最小的编码效率和图像质量损失从传输错误中恢复。

公开(公告)号：US6049570A

公开(公告)日：2000-04-11

申请号：US987774

申请日：1997-12-09

申请人： Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： H04N19/50 ,  G06T9/00 ,  H03M7/36 ,  H04N19/423 ,  H04N19/46 ,  H04N19/503 ,  H04N19/65 ,  H04N19/70 ,  H04N19/85 ,  H04N19/89 ,  H04B14/06

CPC分类号： H04N19/89 ,  H04N19/166 ,  H04N19/172 ,  H04N19/61 ,  H04N19/107

摘要： A picture coder decodes P frames without having to wait for the next I frame even if a data loss occurs, and ensures quick recovery from degraded picture quality. The picture coder, which controls updating of a reference picture based on a decoding status signal and a frame number sent from a picture decoder, uses an acknowledgment signal (ACK signal) as a decoding status signal. The picture coder has a decoding status determination module 109 which determines that a decoding error has occurred if the acknowledgment signal is not received within a specified time. The picture coder also has a reference frame updating module 110 for use when it is determined that a decoding error has occurred. The reference frame updating module 110 selects from pictures, which were received correctly before the decoding error occurred, one picture for use as the reference picture. This makes it possible for the picture coder to decode P frames without having to wait for the next I frame.

摘要翻译： 图像编码器解码P帧，而不必等待下一个I帧，即使发生数据丢失，并确保从劣化的图像质量快速恢复。 基于解码状态信号和从图像解码器发送的帧号控制参考图像的更新的图像编码器使用确认信号（ACK信号）作为解码状态信号。 图像编码器具有解码状态确定模块109，如果在指定时间内没有接收到确认信号，则确定解码错误已经发生。 图像编码器还具有当确定已经发生解码错误时使用的参考帧更新模块110。 参考帧更新模块110从解码错误发生之前正确接收到的图像中选择一个用作参考图像的图像。 这使得图像编码器可以对P帧进行解码，而不必等待下一个I帧。