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：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：US06643326B1

公开(公告)日：2003-11-04

申请号：US09418799

申请日：1999-10-15

申请人： Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： H04N718

CPC分类号： H04N19/172 ,  H04N19/44 ,  H04N19/51 ,  H04N19/895

摘要： A picture decoding apparatus decodes a series of coded frames, each including a temporal reference. Past temporal references are used to estimate the temporal reference of the-current frame. If the temporal reference differs greatly from the estimated value, it is modified according to the estimated value. A coded frame may be divided into segments, each segment having its own temporal reference. In this case, the temporal references received in one coded frame are stored and compared, and a single temporal reference is selected for the coded frame. As a result, temporal-reference errors do not seriously disrupt the timing of the decoded picture.

摘要翻译： 图像解码装置对一系列编码帧进行解码，每一帧包括时间参考。 过去的时间参考用于估计当前帧的时间参考。 如果时间参考值与估计值差异很大，则根据估计值进行修改。 编码帧可以被划分成段，每个段具有其自己的时间参考。 在这种情况下，存储和比较在一个编码帧中接收的时间参考，并且为编码帧选择单个时间参考。 结果，时间参考误差不会严重地破坏解码图像的定时。

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。

公开(公告)号：US06487316B1

公开(公告)日：2002-11-26

申请号：US09659065

申请日：2000-09-11

申请人： Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： G06K936

CPC分类号： H04L1/0014 ,  H04L1/1607 ,  H04L1/1809 ,  H04N19/107 ,  H04N19/162 ,  H04N19/166 ,  H04N19/172 ,  H04N19/573 ,  H04N19/58 ,  H04N19/61 ,  H04N19/89 ,  H04N21/4382 ,  H04N21/43853 ,  H04N21/4425 ,  H04N21/6377 ,  H04N21/658 ,  H04N21/6583

摘要： A transmission system transmits a series of coded frames from a transmitting device to a receiving device, using both intra-frame coding and inter-frame coding. The receiving device decodes the frames and sends acknowledgment signals to the transmitting device. The transmitting device selects the reference frame employed in inter-frame coding according to these acknowledgment signals. The method of reference frame selection can be varied according to an assessment of transmission channel quality. The assessment criteria, or the reference frame selection method itself, can be varied in response to input from a human user.

摘要翻译： 传输系统使用帧内编码和帧间编码来将一系列编码帧从发送设备发送到接收设备。 接收设备解码帧并向发送设备发送确认信号。 发送装置根据这些确认信号，选择帧间编码中使用的参照帧。 参考帧选择的方法可以根据传输信道质量的评估而变化。 评估标准或参考帧选择方法本身可以响应于来自人类用户的输入而变化。

公开(公告)号：US06169821A

公开(公告)日：2001-01-02

申请号：US08710405

申请日：1996-09-17

申请人： Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： G06K900

CPC分类号： H04L1/0014 ,  H04L1/1607 ,  H04L1/1809 ,  H04N19/107 ,  H04N19/162 ,  H04N19/166 ,  H04N19/172 ,  H04N19/573 ,  H04N19/58 ,  H04N19/61 ,  H04N19/89 ,  H04N21/4382 ,  H04N21/43853 ,  H04N21/4425 ,  H04N21/6377 ,  H04N21/658 ,  H04N21/6583

摘要： A transmission system transmits a series of coded frames from a transmitting device to a receiving device, using both intra-frame coding and inter-frame coding. The receiving device decodes the frames and sends acknowledgment signals to the transmitting device. The transmitting device selects the reference frame employed in inter-frame coding according to these acknowledgment signals. The method of reference frame selection can be varied according to an assessment of transmission channel quality. The assessment criteria, or the reference frame selection method itself, can be varied in response to input from a human user.

摘要翻译： 传输系统使用帧内编码和帧间编码来将一系列编码帧从发送设备发送到接收设备。 接收设备解码帧并向发送设备发送确认信号。 发送装置根据这些确认信号，选择帧间编码中使用的参照帧。 参考帧选择的方法可以根据传输信道质量的评估而变化。 评估标准或参考帧选择方法本身可以响应于来自人类用户的输入而变化。

公开(公告)号：US06282240B1

公开(公告)日：2001-08-28

申请号：US08922460

申请日：1997-09-03

申请人： Shigeru Fukunaga ,  Toshihisa Nakai

发明人： Shigeru Fukunaga ,  Toshihisa Nakai

IPC分类号： H04B166

CPC分类号： H04N21/25808 ,  H04N19/107 ,  H04N19/61 ,  H04N19/89 ,  H04N21/26208 ,  H04N21/2662 ,  H04N21/6377 ,  H04N21/6379 ,  H04N21/658 ,  H04N21/6582 ,  H04N21/816

摘要： A coder receives from a decoder the reception result of coded data, estimates the reception capability of the decoder and, based on the estimate result, updates accordingly the reference data on which prediction coding is to be based. This enables the reference data to be updated according to the reception capability of each decoder.

摘要翻译： 编码器从解码器接收编码数据的接收结果，估计解码器的接收能力，并且基于估计结果相应地更新基于预测编码的参考数据。 这使得可以根据每个解码器的接收能力来更新参考数据。

公开(公告)号：US6111915A

公开(公告)日：2000-08-29

申请号：US987590

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 ,  H04N19/423 ,  H04N19/426 ,  H04N19/44 ,  H04N19/46 ,  H04N19/503 ,  H04N19/65 ,  H04N19/70 ,  H04N19/89 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04

CPC分类号： H04N19/423 ,  H04N19/61 ,  H04N19/89 ,  H04N19/107

摘要： A picture decoder decodes P frames without having to wait for a next I frame even if a data loss occurs, and ensures quick recovery from degraded picture quality. The picture decoder sends decoding status information on received coded data to a coder. This makes it possible for the picture coder to perform coding using a frame, successfully decoded by the decoder, as a reference frame. Also, the picture decoder according to the present invention saves in frame memory a frame that is likely to be used as the reference frame, decreasing a probability that received coded data cannot be decoded because there is no reference picture in frame memory and thus increasing coding efficiency. This also keeps the reference frame memory size of the picture decoder to a minimum.

摘要翻译： 即使发生数据丢失，图像解码器解码P帧而不必等待下一个I帧，并且确保从劣化的图像质量快速恢复。 图像解码器将接收到的编码数据的解码状态信息发送到编码器。 这使得图像编码器可以使用由解码器成功解码的帧作为参考帧来执行编码。 此外，根据本发明的图像解码器将可能用作参考帧的帧保存在帧存储器中，降低了由于在帧存储器中没有参考图像而导致接收编码数据不能被解码的概率，从而增加编码 效率。 这也使图像解码器的参考帧存储器大小保持最小。