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公开(公告)号：US08064470B2
公开(公告)日：2011-11-22
申请号：US10593587
申请日：2005-03-16
IPC分类号： H04L12/28
CPC分类号： H04L65/4084 , H04L47/10 , H04L47/22 , H04L65/607 , H04N19/188 , H04N19/44 , H04N19/61 , H04N21/23406 , H04N21/2401 , H04N21/6332 , H04N21/64322 , H04N21/6587
摘要： Recorded material such as video is transmitted in compressed form to a receiver, which has a buffer for smoothing differences between the data rate received and that consumed by a decoder that follows. The whole of the recording is analysed to determine a point at which to commence playing such that no buffer underflow can occur; the decoder commences playing only when this point has been reached.
摘要翻译： 诸如视频的记录材料以压缩的形式传送到接收机，接收机具有用于平滑接收到的数据速率与随后的解码器消耗的数据速率之间的差异的缓冲器。 分析整个记录以确定开始播放的点，使得不会发生缓冲器下溢; 只有达到这一点，解码器才开始播放。
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公开(公告)号：US07912974B2
公开(公告)日：2011-03-22
申请号：US10549912
申请日：2004-03-23
IPC分类号： G06F15/16
CPC分类号： H04L65/602 , H04L29/06027 , H04L65/80
摘要： Data for presentation in real time, such as a video or audio sequence, is available on different encoded versions having different degrees Of compression. In order to assess, during transmission of one version, the feasibility of switching to another version, given the data rate known to be available at the time, a server computes, for a candidate version, in respect of at least one portion thereof that has not yet been sent, the maximum value of a timing error that would occur if any number of portions starting with that portion to be sent at the available rate. The selection of the same or a different version for continuing transmission is taken in dependence on a comparison between the computed error and the current state of a receiving buffer. Error values may be computed in advance for a range of transmitting rates, stored and later retrieved for use in estimating an error value corresponding to the actual transmitting rate.
摘要翻译： 用于实时呈现的数据，例如视频或音频序列，可在具有不同压缩程度的不同编码版本上使用。 为了在一个版本的传输期间评估切换到另一版本的可行性，考虑到当时已知可用的数据速率，服务器针对候选版本针对其候选版本至少有一部分来计算 尚未发送，如果以可用速率发送的部分开始的任何数量的部分将发生定时错误的最大值。 依赖于计算出的错误与接收缓冲器的当前状态之间的比较来进行用于连续传输的相同或不同版本的选择。 可以预先对存储并稍后检索的用于估计对应于实际传输速率的误差值的传输速率的范围来计算误差值。
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公开(公告)号：US08228386B2
公开(公告)日：2012-07-24
申请号：US11916072
申请日：2006-05-19
CPC分类号： H04N17/004
摘要： Faults resulting in reception of a still, but unknown, frame are recognized by comparing each received frame of the video signal with its predecessor, incrementing a counter in the event that the difference between the frames falls below a threshold; and generating an alarm signal in the event that the count of the counter exceeds a predetermined count. Other types of fault such as loss of signal (i.e. reception of just noise) are recognized by incrementing the counter whenever the difference exceeds a threshold. Similar results may be obtained by instead the monitoring quantization step size and/or number of transmitted bits of a digitally coded signal, and noting that it falls below, or exceeds, a threshold. A preferred option is to compute a complexity measure, being a monotonically increasing function (e.g the product) of the quantization step size and of the number of coded bits and compare this with the threshold value. Faults occasioned by receipt of a particular fixed image instead of the wanted picture are recognized by comparing each frame of the video signal with the fixed image, and generating an alarm signal in the event that the difference between the frames consistently falls below a threshold.
摘要翻译： 通过将视频信号的每个接收帧与其前身进行比较来识别导致静止但未知的帧的接收的故障，在帧之间的差异低于阈值的情况下增加计数器; 并且在计数器的计数超过预定计数的情况下产生报警信号。 当差异超过阈值时，通过增加计数器来识别其它类型的故障，例如信号的丢失（即仅接收噪声）。 可以通过代替监视数字编码信号的发送位的量化步长和/或数量，并注意到其下降或超过阈值来获得相似的结果。 优选的选择是计算复杂性度量，其是量化步长和编码比特数的单调递增函数（例如乘积），并将其与阈值进行比较。 通过将视频信号的每一帧与固定图像进行比较来识别通过接收到特定固定图像而不是想要的图像而引起的故障，并且在帧之间的差异始终低于阈值的情况下产生报警信号。
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公开(公告)号：US20080137735A1
公开(公告)日：2008-06-12
申请号：US11792855
申请日：2005-12-08
CPC分类号： H04N19/198 , H04N19/124 , H04N19/132 , H04N19/134 , H04N19/149 , H04N19/15 , H04N19/152 , H04N19/159 , H04N19/164 , H04N19/169 , H04N19/172 , H04N19/194 , H04N19/196 , H04N19/587
摘要： A video sequence (4) is subjected to a signal compression process, in which the video sequence is divided (14) into a plurality of segments such that in each segment the number of bits required to code each frame in uncompressed form falls within a range having a predetermined magnitude, and a quantisation level is selected (17) for the encoding (19) of each segment such that the overall bit rate of the segment corresponds to a predetermined value. This value may be pre-set, or may be set in response to an input from the transmission network (3) or remote decoder (2). The quantisation level Q is determined according to a function of the number of bits per frame R, determined by analysis (10,11,12,13) of the entire sequence prior to transmission.
摘要翻译： 对视频序列（4）进行信号压缩处理，其中视频序列被划分成多个片段，使得在每个片段中，以未压缩形式编码每个帧所需的比特数落在一个范围内 具有预定幅度，并且为每个段的编码（19）选择（17）量化级别，使得段的总比特率对应于预定值。 该值可以被预设，或者可以响应于来自传输网络（3）或远程解码器（2）的输入而被设置。 根据在传输之前的整个序列的分析（10,11,12,13）确定的每帧R的位数的函数来确定量化水平Q。
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公开(公告)号：US20080198234A1
公开(公告)日：2008-08-21
申请号：US11916072
申请日：2006-05-19
IPC分类号： H04N17/00
CPC分类号： H04N17/004
摘要： Faults resulting in reception of a still, but unknown, frame are recognised by comparing each received frame of the video signal with its predecessor, incrementing a counter in the event that the difference between the frames falls below a threshold; and generating an alarm signal in the event that the count of the counter exceeds a predetermined count. Other types of fault such as loss of signal (i.e. reception of just noise) are recognised by incrementing the counter whenever the difference exceeds a threshold. Similar results may be obtained by instead the monitoring quantisation step size and/or number of transmitted bits of a digitally coded signal, and noting that it falls below, or exceeds, a threshold. A preferred option is to compute a complexity measure, being a monotonically increasing function (e.g the product) of the quantisation step size and of the number of coded bits and compare this with the threshold value. Faults occasioned by receipt of a particular fixed image instead of the wanted picture are recognised by comparing each frame of the video signal with the fixed image, and generating an alarm signal in the event that the difference between the frames consistently falls below a threshold.
摘要翻译： 通过将视频信号的每个接收帧与其前身进行比较来识别导致仍然但未知的帧的接收的故障，在帧之间的差异低于阈值的情况下增加计数器; 并且在计数器的计数超过预定计数的情况下产生报警信号。 当差异超过阈值时，通过增加计数器来识别其它类型的故障，例如信号的丢失（即仅接收噪声）。 可以通过监视数字编码信号的发送位的量化步长和/或数量，并注意到其下降或超过阈值来获得类似的结果。 优选的选择是计算复杂性度量，其是量化步长和编码比特数的单调递增函数（例如乘积），并将其与阈值进行比较。 通过将视频信号的每个帧与固定图像进行比较来识别通过接收到特定固定图像而不是所需图像而产生的故障，并且在帧之间的差异始终低于阈值的情况下产生报警信号。
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公开(公告)号：US20080130737A1
公开(公告)日：2008-06-05
申请号：US11792854
申请日：2005-12-08
IPC分类号： H04N11/02
CPC分类号： H04N19/124 , H04N19/132 , H04N19/149 , H04N19/15 , H04N19/172 , H04N19/194 , H04N19/196 , H04N19/198 , H04N19/587 , H04N21/23406 , H04N21/2368 , H04N21/4305 , H04N21/4341 , H04N21/44004
摘要： A video stream is digitally encoded such that the rate at which individual segments of data are encoded varies according to the amount of data required to generate each segment. Frames are selectively omitted from transmission (32) such that the cumulative frame rate does not fall below a predetermined value. This process can be used to ensure that the next frame to be displayed is always available in the buffer store 6 associated with the decoder (2). The decoder (2) is arranged to identify where frames have been omitted from the decoded transmission, and to perform a resynchronisation (7) on the decoded stream by comparison between time stamps in the video stream and a corresponding audio stream. Resynchronisation may be performed by extending the durations of individual frames, or by repeating frames.
摘要翻译： 视频流被数字编码，使得数据的各个段被编码的速率根据产生每个段所需的数据量而变化。 从传输（32）中选择性地省略帧，使得累积帧速率不降低到预定值以下。 该过程可以用于确保在与解码器（2）相关联的缓冲存储器6中将要显示的下一帧总是可用。 解码器（2）被布置为识别从解码的传输中哪里已经被省略的位置，并且通过在视频流中的时间戳与相应的音频流之间的比较来对解码的流执行再同步（7）。 可以通过扩展单个帧的持续时间或重复帧来执行重新同步。
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公开(公告)号：US20080025340A1
公开(公告)日：2008-01-31
申请号：US10593587
申请日：2005-03-16
IPC分类号： H04L12/413
CPC分类号： H04L65/4084 , H04L47/10 , H04L47/22 , H04L65/607 , H04N19/188 , H04N19/44 , H04N19/61 , H04N21/23406 , H04N21/2401 , H04N21/6332 , H04N21/64322 , H04N21/6587
摘要： Recorded material such as video is transmitted in compressed form to a receiver, which has a buffer for smoothing differences between the data rate received and that consumed by a decoder that follows. The whole of the recording is analysed to determine a point at which to commence playing such that no buffer underflow can occur; the decoder commences playing only when this point has been reached.
摘要翻译： 诸如视频的记录材料以压缩的形式传送到接收机，接收机具有用于平滑接收到的数据速率与随后的解码器消耗的数据速率之间的差异的缓冲器。 分析整个记录以确定开始播放的点，使得不会发生缓冲器下溢; 只有达到这一点，解码器才开始播放。
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公开(公告)号：US20060195612A1
公开(公告)日：2006-08-31
申请号：US10549912
申请日：2004-03-23
IPC分类号： G06F15/16
CPC分类号： H04L65/602 , H04L29/06027 , H04L65/80
摘要： Data for presentation in real time, such as a video or audio sequence, is available on different encoded versions having different degrees of compression. In order to assess, during transmission of one version, the feasibility of switching to another version, given the data rate known to be available at the time, a server computes, for a candidate version, in respect of at least one portion thereof that has not yet been sent, the maximum value of a timing error that would occur if any number of portions starting with that portion to be sent at the available rate. The selection of the same or a different version for continuing transmission is taken in dependence on a comparison between the computed error and the current state of a receiving buffer. Error values may be computed in advance for a range of transmitting rates, stored and later retrieved for use in estimating an error value corresponding to the actual transmitting rate.
摘要翻译： 用于实时呈现的数据（例如视频或音频序列）可在具有不同压缩程度的不同编码版本上使用。 为了在一个版本的传输期间评估切换到另一版本的可行性，考虑到当时已知可用的数据速率，服务器针对候选版本针对其候选版本至少有一部分来计算 尚未发送，如果以可用速率发送的部分开始的任何数量的部分将发生定时错误的最大值。 依赖于计算出的错误与接收缓冲器的当前状态之间的比较来进行用于连续传输的相同或不同版本的选择。 可以预先对存储并稍后检索的用于估计对应于实际传输速率的误差值的传输速率的范围来计算误差值。
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公开(公告)号：US20050123047A1
公开(公告)日：2005-06-09
申请号：US10505953
申请日：2003-03-12
IPC分类号： G06T9/00 , H04N19/895 , H04N7/12
CPC分类号： H04N19/66 , H04N19/68 , H04N19/69 , H04N19/895
摘要： A method of decoding encoded video data, the encoded video data being arranged as a plurality of video picture segments, the data of the video picture segments being arranged so that all header data for the segment are transmitted together and all motion vector data for the segment are transmitted together, the header data and motion vector data being separated by markers, the method comprising: receiving encoded video data; attempting to decode header information of an encoded video segment; when an attempt to decode all of the header information of an encoded video segment is unsuccessful, attempting to decode the motion vectors for the encoded video segment and, when the motion vectors for the encoded video segment have been successfully decoded, using the motion vectors with any successfully decoded header information.
摘要翻译： 一种对编码视频数据进行解码的方法，编码视频数据被排列为多个视频图像段，视频图像段的数据被布置成使得该段的所有标题数据被一起发送，并且该段的所有运动矢量数据 标题数据和运动矢量数据被标记分开，所述方法包括：接收编码视频数据; 尝试解码编码视频片段的标题信息; 当解码编码视频片段的所有标题信息的尝试不成功时，尝试对编码视频片段的运动矢量进行解码，并且当编码视频片段的运动矢量已被成功解码时，使用具有 任何成功解码的标题信息。
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公开(公告)号：US08311094B2
公开(公告)日：2012-11-13
申请号：US11792854
申请日：2005-12-08
IPC分类号： H04N7/12
CPC分类号： H04N19/124 , H04N19/132 , H04N19/149 , H04N19/15 , H04N19/172 , H04N19/194 , H04N19/196 , H04N19/198 , H04N19/587 , H04N21/23406 , H04N21/2368 , H04N21/4305 , H04N21/4341 , H04N21/44004
摘要： A video stream is digitally encoded such that the rate at which individual segments of data are encoded varies according to the amount of data required to generate each segment. Frames are selectively omitted from transmission (32) such that the cumulative frame rate does not fall below a predetermined value. This process can be used to ensure that the next frame to be displayed is always available in the buffer store 6 associated with the decoder (2). The decoder (2) is arranged to identify where frames have been omitted from the decoded transmission, and to perform a resynchronisation (7) on the decoded stream by comparison between time stamps in the video stream and a corresponding audio stream. Resynchronisation may be performed by extending the durations of individual frames, or by repeating frames.
摘要翻译： 视频流被数字编码，使得数据的各个段被编码的速率根据产生每个段所需的数据量而变化。 从传输（32）中选择性地省略帧，使得累积帧速率不降低到预定值以下。 该过程可以用于确保在与解码器（2）相关联的缓冲存储器6中将要显示的下一帧总是可用。 解码器（2）被布置为识别从解码的传输中哪里已经被省略的位置，并且通过在视频流中的时间戳与对应的音频流之间的比较来对解码的流执行重新同步（7）。 可以通过扩展单个帧的持续时间或重复帧来执行重新同步。
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