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公开(公告)号：EP2661894A1
公开(公告)日：2013-11-13
申请号：EP11799454.1
申请日：2011-12-23
申请人： Skype
发明人： ANDERSON, Ian , JEFREMOV, Andrei , VAFIN, Renat , ZHAO, David
IPC分类号： H04N7/68
CPC分类号： H04N19/895
摘要： A system comprising: a receiver for receiving a video signal over a lossy medium; and a decoder coupled to the receiver and arranged to decode the video signal for output to a display, the decoder including a concealment module for regenerating a portion of image data lost from the video signal over said medium, by interpolating or extrapolating from other image data of the video signal received over the medium. The decoder comprises a controller configured to select, based on a measure of loss effect estimated for the portion of image data, whether (i) to apply the concealment module to regenerate the portion of image data, or alternatively (ii) to freeze preceding image data of the video signal in place of the portion of image data.
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公开(公告)号：EP2522142A2
公开(公告)日：2012-11-14
申请号：EP11704450.3
申请日：2011-02-18
申请人： Skype
CPC分类号： H04N19/115 , H04N19/105 , H04N19/107 , H04N19/119 , H04N19/146 , H04N19/176 , H04N19/46 , H04N19/48 , H04N19/59 , H04N19/61
摘要： A method of transmitting video data from a transmitter to a receiver, the method comprising: receiving data values of a video signal at a higher resolution; at the transmitter, combining groups of the data values into one or more first units of a first lower-resolution arrangement; encoding and transmitting the first lower-resolution arrangement to the receiver; at the transmitter, combining groups of the data values into one or more second units of a second lower-resolution arrangement, wherein the second units are offset from the first units by a fractional shift such that each second unit partially overlaps with at least one first unit; encoding and transmitting the second lower-resolution arrangement to the receiver; and transmitting an indication of said shift to the receiver; and at the receiver, combining the first and second lower-resolution arrangements based on the indication so as to reconstruct an image of at least a higher resolution than that of the first and second lower- resolution arrangements.
摘要翻译： 一种从发射机向接收机传输视频数据的方法，该方法包括：以较高分辨率接收视频信号的数据值; 在发射机处，将数据值组组合成第一较低分辨率布置的一个或多个第一单元; 将所述第一较低分辨率布置编码并发送到所述接收器; 在发射机处，将数据值组组合成第二较低分辨率布置的一个或多个第二单元，其中第二单元从第一单元偏移分数移位，使得每个第二单元部分地与至少一个第一单元 单元; 将所述第二较低分辨率布置编码并发送到所述接收器; 以及向所述接收器发送所述转变的指示; 并且在接收器处，基于该指示组合第一和第二较低分辨率布置，以便重构至少比第一和第二较低分辨率布置的分辨率更高的分辨率的图像。
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公开(公告)号：EP2522141B1
公开(公告)日：2019-04-24
申请号：EP11704449.5
申请日：2011-02-18
申请人： Skype
IPC分类号： H04N19/105 , H04N19/176 , H04N19/119 , H04N19/46 , H04N19/115 , H04N19/61 , H04N19/107 , H04N19/146 , H04N19/48 , H04N19/59
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公开(公告)号：EP2522141A1
公开(公告)日：2012-11-14
申请号：EP11704449.5
申请日：2011-02-18
申请人： Skype
CPC分类号： H04N19/115 , H04N19/105 , H04N19/107 , H04N19/119 , H04N19/146 , H04N19/176 , H04N19/46 , H04N19/48 , H04N19/59 , H04N19/61
摘要： A method of compressing video data, the method comprising: providing image data for each of a plurality of image portions; determining an index value for each of said image portions based on the respective image data; for a target image portion to be encoded, identifying a matching image portion having an index value within a search threshold of the index value of the target image portion; and generating difference data for the target image portion relative to the matching image portion, and including the difference data in an encoded video signal.
摘要翻译： 一种压缩视频数据的方法，该方法包括：为多个图像部分中的每一个提供图像数据; 基于各个图像数据确定每个所述图像部分的索引值; 对于要被编码的目标图像部分，识别具有在目标图像部分的索引值的搜索阈值内的索引值的匹配图像部分; 并且生成目标图像部分相对于匹配图像部分的差分数据，并且将该差分数据包括在编码视频信号中。
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公开(公告)号：EP2135240A2
公开(公告)日：2009-12-23
申请号：EP07872094.3
申请日：2007-12-20
申请人： Skype Limited
IPC分类号： G10L19/00
CPC分类号： G10L19/26 , G10L19/005 , G10L21/0364
摘要： A system for enhancing a signal regenerated from an encoded audio signal. The system comprises a decoder arranged to receive the encoded audio signal and produce a decoded audio signal, a feature extraction means arranged to receive at least one of the decoded and encoded audio signal and extract at least one feature from at least one of the decoded and encoded audio signal, a mapping means arranged to map the at least one feature to an enhancement signal and operable to generate and output the enhancement signal, whereby the enhancement signal has a frequency band that is within the decoded audio signal frequency band, and a mixing means arranged to receive the decoded audio signal and the enhancement signal and mix the enhancement signal with the decoded audio signal.
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公开(公告)号：EP2710802A1
公开(公告)日：2014-03-26
申请号：EP12728298.6
申请日：2012-06-22
申请人： Skype
IPC分类号： H04N7/26
CPC分类号： H04N19/194 , H04N19/103 , H04N19/147 , H04N19/156 , H04N19/176 , H04N19/19
摘要： A method of encoding a video stream comprising: for each of a plurality of first image portions to be encoded in an outgoing video stream, selecting a preferred one of a set of potential encoding modes using a first process comprising an estimation of distortion of the first image portion and a measure of bit rate required to encode the first image portion for each of the first image portion's potential encoding modes; encoding each of the first image portions of the outgoing stream using the respective selected encoding mode; for each of a plurality of second image portions of a video stream, applying a second process comprising at least an estimation of distortion of the second image portion; and using an output of the second process resulting from the second image portions to bias the first process in said selection of the encoding modes for the first portions.
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公开(公告)号：EP2522143A2
公开(公告)日：2012-11-14
申请号：EP11704978.3
申请日：2011-02-18
申请人： Skype
IPC分类号： H04N7/26
CPC分类号： H04N19/115 , H04N19/105 , H04N19/107 , H04N19/119 , H04N19/146 , H04N19/176 , H04N19/46 , H04N19/48 , H04N19/59 , H04N19/61
摘要： A method of encoding a video signal for transmission, comprising: receiving a video signal comprising a plurality of video frames, each frame being divided into a plurality of image portions; for each of a plurality of target ones of said image portions to be encoded, selecting a respective reference portion, generating respective residual data based on the target portion relative to the respective reference portion; during ongoing encoding of the video signal, generating a table of commonly usable reference portions and transmitting an indication of the table to a decoder; and generating an encoded bitstream comprising the residual data together with side information identifying the selected reference portions by reference to an entry in said table, and transmitting the encoded bitstream to the decoder.
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公开(公告)号：EP2520095A2
公开(公告)日：2012-11-07
申请号：EP11705855.2
申请日：2011-02-18
申请人： Skype
IPC分类号： H04N7/32
CPC分类号： H04N19/94 , H04N19/105 , H04N19/147 , H04N19/176 , H04N19/18 , H04N19/46 , H04N19/547
摘要： A method of compressing a video signal. The method comprises: for each of a plurality of image portions, transforming from a spatial domain representation into a transform domain representation; and for each of a plurality of target image portions to be encoded, determining a respective reference portion, determining a prediction of the target image portion based on the reference portion, and encoding the target image portion based on the prediction. The prediction comprises predicting a non- lateral motion of the target image portion relative to the reference portion based on processing of their transform domain coefficients. The encoding comprises generating an encoded bitstream comprising information about the non-lateral motion for use by a decoder.
摘要翻译： 一种压缩视频信号的方法。 该方法包括：对于多个图像部分中的每一个，从空间域表示转换为变换域表示; 并且对于要被编码的多个目标图像部分中的每一个，确定相应的参考部分，基于参考部分确定目标图像部分的预测，以及基于预测编码目标图像部分。 预测包括基于对它们的变换域系数的处理来预测目标图像部分相对于参考部分的非横向运动。 该编码包括生成包括关于供解码器使用的非横向运动的信息的编码比特流。
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公开(公告)号：EP2520025A1
公开(公告)日：2012-11-07
申请号：EP11705195.3
申请日：2011-02-18
申请人： Skype
IPC分类号： H03M7/40
CPC分类号： H03M7/40 , H03M7/4018
摘要： An encoder stage, and corresponding encoded bitstream and decoder. The encoder stage comprises: a variable length encoder for encoding an input signal; and a counter configured to dynamically detect an observed frequency at which different symbols are found to occur within each of a plurality of predetermined portions of the input signal, prior to the symbols of each respective portion being encoded by the variable length encoder. The variable length encoder is configured to encode the symbols of each portion using variable length coding performed in dependence on the observed frequencies detected within the respective portion of the input signal, to generate an encoded bitstream comprising the encoded symbols along with an additional element indicating information regarding the observed frequencies detected for each portion, and to output the encoded bitstream to at least one of a storage medium and a transmission medium for supply to a decoder.
摘要翻译： 编码器级，以及对应的编码比特流和解码器。 编码器级包括：用于编码输入信号的可变长度编码器; 以及配置为在每个相应部分的符号被可变长度编码器编码之前动态地检测在输入信号的多个预定部分的每一个内发现不同符号的观察频率的计数器。 可变长度编码器被配置为使用根据在输入信号的相应部分内检测到的观察频率执行的可变长度编码对每个部分的符号进行编码，以生成包含编码符号的编码比特流以及指示信息的附加元素 关于针对每个部分检测到的观察到的频率，并且将编码的比特流输出到存储介质和传输介质中的至少一个，以供给解码器。
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公开(公告)号：EP2140637A2
公开(公告)日：2010-01-06
申请号：EP07870467.3
申请日：2007-12-20
申请人： Skype Limited
发明人： RODBRO, Christoffer , JENSEN, Soren Skak , LINDBLOM, Jonas , VAFIN, Renat , ANDERSEN, Soren Vang
IPC分类号： H04L12/64
CPC分类号： H04L12/6418 , H04L12/66 , H04L2012/6489
摘要： A method of processing a signal received at a node in a network, comprising the steps of; receiving the signal at the node; determining characteristics of a first part of the signal; determining characteristics of a second part of the signal that is subsequent to the first part of the signal; quantifying an effect on the signal caused by applying an action to the first part of the signal, based on characteristics of the first part of the signal; quantifying an effect on the signal caused by not applying the action on the first part of the signal, based on characteristics of the second part of the signal; applying the action to the first part of the signal if it is determined that the effect on the signal caused by applying the action to the first part of the signal is less detrimental to at least one measure of the signal quality than the effect on the signal caused by not applying the action to the first part of the signal.
摘要翻译： 一种处理在网络中的节点处接收的信号的方法，包括以下步骤： 在节点处接收信号; 确定所述信号的第一部分的特性; 确定信号的第一部分之后的信号的第二部分的特性; 基于所述信号的所述第一部分的特性来量化由于对所述信号的所述第一部分应用动作而引起的对所述信号的影响; 基于所述信号的所述第二部分的特性，量化由于未对所述信号的所述第一部分应用所述动作而导致的对所述信号的影响; 如果确定对信号的第一部分施加动作对信号的影响对信号质量的至少一个测量的影响比对信号的影响的影响更小，则将该动作应用于信号的第一部分 由于未将动作应用于信号的第一部分而导致。
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