公开(公告)号：US5361096A

公开(公告)日：1994-11-01

申请号：US131439

申请日：1993-10-04

申请人： Junichi Ohki ,  Toshio Koga

发明人： Junichi Ohki ,  Toshio Koga

IPC分类号： H04N19/00 ,  H04N7/08 ,  H04N7/081 ,  H04N7/12 ,  H04N7/50 ,  H04N19/102 ,  H04N19/107 ,  H04N19/115 ,  H04N19/134 ,  H04N19/142 ,  H04N19/146 ,  H04N19/169 ,  H04N19/172 ,  H04N19/189 ,  H04N19/46 ,  H04N19/50 ,  H04N19/503 ,  H04N19/65 ,  H04N19/67 ,  H04N19/70 ,  H04N21/2365 ,  H04N21/434 ,  H04N7/13

CPC分类号： H04N21/4347 ,  H04N19/107 ,  H04N19/61 ,  H04N21/2365 ,  H04N21/2385 ,  H04N21/4384

摘要： Time-varying picture signals of a plurality of channels are predictively coded by utilizing the interframe correlation and multiplexed at the transmitting side. The signals are separated for each channel, switched and selected for any channel for decoding at the receiving side after transmitted. When the receiving channel is switched over to other channel, a decoding error can occur and a reproduced screen can collapse since the predicting signals do not coincide with each other at the transmitting and receiving sides. Therefore, when the plurality of channels is selectively switched for decoding by using a single decoder, the refresh is repeated at predetermined time intervals in a short period of time by utilizing the intraframe correlation when the coding is carried out at the transmitting side so that, even if the channel is switched, an excellent reproduced screen may be immediately obtained. However, during the refresh, the compression ratio is reduced compared with that of the bit rate when a normal interframe correlation is carried out. Therefore, when the refresh is carried out, the amount of transmitted information for part or all of the channels other than the refreshed channel is compressed and, conversely, the amount of transmitted information for the refreshed channel is increased by the compressed amount and allocated. Thus, even if the channel is switched at the receiving side, the decoded image for the newly selected channel can be promptly reproduced.

摘要翻译： 多个信道的时变图像信号通过利用帧间相关被预测编码，并在发送侧多路复用。 对于每个信道分离信号，对于任何信道进行切换和选择，以便在发送后的接收侧进行解码。 当接收信道切换到其他信道时，由于预测信号在发送侧和接收侧彼此不一致，所以可能会发生解码错误并且再现的屏幕可能崩溃。 因此，当通过使用单个解码器选择性地切换多个信道进行解码时，在发送侧执行编码时，通过利用帧内相关性，在短时间内以预定的时间间隔重复刷新， 即使切换通道，也可以立即获得良好的再现画面。 然而，在刷新期间，当执行正常的帧间相关时，与比特率的压缩比相比，压缩比降低。 因此，当执行刷新时，除了刷新的信道之外的部分或全部信道的发送信息的量被压缩，相反地，被刷新的信道的发送信息的量增加了压缩量并被分配。 因此，即使在接收侧切换信道，也可以迅速地再现新选择的信道的解码图像。

公开(公告)号：US4924311A

公开(公告)日：1990-05-08

申请号：US339441

申请日：1989-04-17

申请人： Jun'ichi Ohki ,  Toshio Koga

发明人： Jun'ichi Ohki ,  Toshio Koga

IPC分类号： H04N7/26 ,  H04N7/36 ,  H04N7/50

CPC分类号： H04N19/107 ,  H04N19/503 ,  H04N19/61

摘要： In a teleconferencing system, a video encoder at the transmit end of the system includes a frame memory for storing video samples of a frame of a motion-picture signal and reading video samples at frame intervals. For still-picture transmission, an encoder circuit translates video samples read out of each successively shifted location of the frame memory which corresponds to at least one scanning line period of the frame into a signal representative of an intraframe correlation between adjacent video samples and generates a signal of a constant value during remaining line periods of the frame. For motion-picture transmission, video samples of the motion-picture signal for at least one scanning line period are translated into a signal representative of the intraframe correlation and video samples of remaining line periods of each successive frame are translated into a signal representative of the interframe correlation between successive frames. A video decoder at the receive end recovers a video sample from successively received intraframe correlation representative signals, delays it for a frame period to recover a video sample from the delayed sample together with a subsequently received signal which is the constant value signal during the still-picture mode and which is the interframe correlation representative signal during the motion-picture mode. The decoder further delays the last-mentioned video sample for a frame period to repeat the recovery process.

摘要翻译： 在电话会议系统中，系统发射端的视频编码器包括帧存储器，用于存储运动图像信号的帧的视频样本，并以帧间隔读取视频样本。 对于静止图像传输，编码器电路将对应于帧的至少一个扫描行周期的帧存储器的每个连续移位的位置读出的视频样本转换为表示相邻视频样本之间的帧内相关的信号，并产生 在帧的剩余行周期期间的恒定值的信号。 对于运动图像传输，用于至少一个扫描行周期的运动图像信号的视频样本被转换为表示帧内相关性的信号，并且将每个连续帧的剩余行周期的视频采样转换为代表 连续帧之间的帧间相关。 接收端的视频解码器从连续接收到的帧内相关代表信号中恢复视频采样，将其延迟帧周期，从延迟采样中恢复视频采样以及随后接收到的信号，该信号是静态信号期间的恒定值信号， 并且其是运动图像模式期间的帧间相关代表信号。 解码器进一步延迟最后提到的视频样本一段帧周期以重复恢复过程。

公开(公告)号：US4733298A

公开(公告)日：1988-03-22

申请号：US797630

申请日：1985-11-13

申请人： Toshio Koga

发明人： Toshio Koga

IPC分类号： H03M7/30 ,  H04N19/50 ,  H04N7/12 ,  H04N7/18

CPC分类号： H04N19/105 ,  H04N19/10 ,  H04N19/112 ,  H04N19/137 ,  H04N19/152 ,  H04N19/50 ,  H04N19/98

摘要： In coding a digital video signal representative of successive pictures by using correlation between the successive pictures, each picture is divided into a predetermined number of blocks of picture elements. An original motion vector is used to represent a movement of each block between two pictures. The digital video signal is predictively coded by using the original motion vector to produce a coded signal. An on-off control signal is produced in order to determine whether or not subsampling is carried out at each of the blocks. A part of the coded signal is subsampled into a subsampled signal with reference to the on-off control signal and a remaining part is left as it is as a non-subsampled signal. The subsampled and the non-subsampled signals are code-converted into a converted code signal. The original motion vector and the on-off control signal are code-converted into a converted motion vector signal and a converted control signal which is distinguishable from the converted motion vector signal. The converted control signal specifies transition points which appear in the on-off control signal when the on-off control signal is switched between off and on.

摘要翻译： 在通过使用连续画面之间的相关性对代表连续画面的数字视频信号进行编码时，每个画面被划分成预定数量的像素块。 原始运动矢量用于表示两个图像之间的每个块的运动。 通过使用原始运动矢量预测编码数字视频信号以产生编码信号。 产生开/关控制信号，以便确定在每个块处是否执行二次采样。 编码信号的一部分参考开关控制信号被二次采样为子采样信号，剩余部分作为非二次采样信号保持原样。 子采样和非子采样信号被码转换成转换的码信号。 原始运动矢量和开关控制信号被代码转换成转换的运动矢量信号和与转换的运动矢量信号区分开的转换的控制信号。 经转换的控制信号指定在断开控制信号在断开和接通之间切换时出现在开 - 关控制信号中的转变点。

公开(公告)号：US4723161A

公开(公告)日：1988-02-02

申请号：US841175

申请日：1986-03-19

申请人： Toshio Koga

发明人： Toshio Koga

IPC分类号： G06T9/00 ,  H04N7/26 ,  H04N7/50 ,  H04N7/12

CPC分类号： H04N19/12 ,  H04N19/112 ,  H04N19/30 ,  H04N19/61

摘要： In order to encode image signals using interframe correlation while maintaining high data compression as well as high resulting images, a motion compensated interframe prediction error is orthogonally transformed and then is subject to quantization. Thereafter, the quantized error signal undergoes inverse orthogonal transformation. In order to compensate for distortions caused by the quantization, a difference between the inversely orthogonally transformationed error signal and the original prediction error signal is quantized. By selecting the quantization characteristics, the influence or contribution of the orthogonal transformation can be controlled continuously.

摘要翻译： 为了在保持高数据压缩以及高成像图像的同时使用帧间相关编码图像信号，对运动补偿帧间预测误差进行正交变换，然后进行量化。 此后，经量化误差信号进行逆正交变换。 为了补偿由量化造成的失真，量化反向正交变换的误差信号与原始预测误差信号之间的差异。 通过选择量化特性，可以连续地控制正交变换的影响或贡献。

公开(公告)号：US4202011A

公开(公告)日：1980-05-06

申请号：US865147

申请日：1977-12-28

申请人： Toshio Koga

发明人： Toshio Koga

IPC分类号： G06T9/00 ,  H04N7/46 ,  H04N11/04 ,  H04N7/12

CPC分类号： H04N19/00 ,  H04N19/124 ,  H04N19/152 ,  H04N19/587 ,  H04N19/59 ,  H04N19/50

摘要： A television signal coder of the type which makes use of correlations to compress the amount of information transmitted. n fields are selected for every m fields (m, n being positive integers; m>n), and a predicted signal level for each picture element in the n fields is represented by an interpolated value of the respective spatially corresponding picture elements in the preceding and succeeding fields. The prediction error which is the difference between the interpolated value and each corresponding picture element is coded and transmitted. The signal for the remaining (m-n) fields are coded and transmitted according to conventional coding systems.

摘要翻译： 一种使用相关性来压缩发送的信息量的类型的电视信号编码器。 对于每个m个场（m，n是正整数; m> n）选择n个场，并且n个场中的每个像素的预测信号电平由前面的相应的空间对应的像素的内插值表示 和后续领域。 编码并发送作为内插值与每个对应的像素之间的差的预测误差。 剩余（m-n）场的信号根据常规编码系统进行编码和传输。