公开(公告)号：EP2712482B1

公开(公告)日：2020-04-08

申请号：EP12729964.2

申请日：2012-06-22

申请人： Skype

发明人： NILSSON, Mattias ,  VAFIN, Renat ,  ANDERSEN, Soren Vang

IPC分类号： H04N19/176 ,  H04N19/147 ,  H04N19/103 ,  H04N19/154 ,  H04N19/166 ,  H04N19/19 ,  H04N19/89

公开(公告)号：EP3609179A1

公开(公告)日：2020-02-12

申请号：EP17907272.3

申请日：2017-12-31

申请人： Huawei Technologies Co., Ltd.

发明人： XIONG, Jie ,  ZHANG, Yanfang ,  FENG, Ligang ,  CHENG, Jian

IPC分类号： H04N17/00 ,  H04L29/06 ,  H04N19/169 ,  H04N19/89 ,  H04N21/442 ,  H04N21/647 ,  H04N19/154 ,  H04N21/6375 ,  H04N21/24 ,  H04N21/6437

摘要： Embodiments of this application disclose a video quality assessment method and device, to improve accuracy of video quality assessment, and a calculated MOSV is more consistent with real video experience of a user. The video quality assessment method provided in the embodiments of this application includes: obtaining a to-be-assessed video, where the to-be-assessed video includes a forward error correction FEC redundancy data packet; when a quantity of lost data packets of a first source block in the to-be-assessed video is less than or equal to a quantity of FEC redundancy data packets of the first source block, generating a first summary packet for a non-lost data packet of the first source block, and generating a second summary packet for a lost data packet of the first source block; and calculating a mean opinion score of video MOSV of the to-be-assessed video based on the first summary packet and the second summary packet.

公开(公告)号：EP3518544A1

公开(公告)日：2019-07-31

申请号：EP19157140.5

申请日：2012-01-11

申请人： CANON KABUSHIKI KAISHA

发明人： GISQUET, Christophe ,  LAROCHE, Guillaume

IPC分类号： H04N19/52 ,  H04N19/139 ,  H04N19/176 ,  H04N19/46 ,  H04N19/103 ,  H04N19/192 ,  H04N19/65 ,  H04N19/89

摘要： For an image portion to decode an initial set of motion information predictors is obtained (S502). It is tested (S512) whether the number (N) of motion information predictors in the initial set is lower than a target number (Nmax) and, if so, one or more motion information predictors are added (S516) to the initial set to generate a set of motion information predictors. The motion information predictors of the initial set are actual motion information predictors, having motion vectors obtained from image portions of the image being encoded or of a reference image, and potential motion information predictors for addition include one or more further such actual motion information predictors and also include one or more virtual motion information predictors not having motion vectors obtained from image portions of said image being encoded or of a reference image. A motion information predictor for the image portion to decode is selected from the generated set of motion information predictors.

公开(公告)号：EP2553896B1

公开(公告)日：2018-11-28

申请号：EP11711364.7

申请日：2011-03-31

申请人： InterDigital Madison Patent Holdings

发明人： BICHOT, Guillaume ,  GOUACHE, Stéphane

IPC分类号： H04L29/08 ,  H04L29/06 ,  H04N19/12 ,  H04N19/156 ,  H04N19/30 ,  H04N19/89 ,  H04N19/164

CPC分类号： H04L65/1046 ,  H04L65/4084 ,  H04L65/80 ,  H04L67/2823 ,  H04N19/12 ,  H04N19/156 ,  H04N19/164 ,  H04N19/30 ,  H04N19/89

摘要： The present invention concerns an adaptive streaming method, at a client device, for receiving content split into chunks corresponding to a content duration, the chunks being encoded at a server into at least a first and a second formats, the first format corresponding to a better content rendering quality level than the second format, a chunk being received during a chunk reception period. According to the invention, the method comprises the steps of measuring the available bandwidth between the client and the server for the next chunk reception period, requesting the server to send a chunk encoded at a format so that the chunk can be received during the next chunk reception period, and if some bandwidth is available for the next chunk reception period, requesting the server to send a part of a chunk encoded at a second format, the chunk having been received encoded at the first format.

公开(公告)号：EP1920608B1

公开(公告)日：2018-11-14

申请号：EP05792662.8

申请日：2005-08-30

申请人： Thomson Licensing

发明人： HAN, Liqiao ,  LIU, Hang ,  RAMASWAMY, Kumar

IPC分类号： H04N19/37 ,  H04N19/66 ,  H04N19/67 ,  H04N19/89 ,  H04N19/34

CPC分类号： H04N21/6405 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0014 ,  H04L2001/0093 ,  H04N19/115 ,  H04N19/154 ,  H04N19/166 ,  H04N19/187 ,  H04N19/34 ,  H04N19/89 ,  H04N21/234327 ,  H04N21/2662 ,  H04N21/43637 ,  H04N21/440227 ,  H04N21/6131

摘要： A system and method for transmitting video signals to a plurality of receivers in a multicast session, including controlling and adapting coding, transmission and protection schemes of a plurality of layers of a network protocol stack are described.

公开(公告)号：EP2946555B1

公开(公告)日：2018-07-04

申请号：EP14700727.2

申请日：2014-01-17

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： HELLGE, Cornelius ,  SCHIERL, Thomas ,  SANCHEZ, Yago ,  HENSEL, Manuel

IPC分类号： H04N19/29 ,  H04N19/39 ,  H04N19/46 ,  H04N19/70 ,  H04N19/89 ,  H03M13/00 ,  H04N21/2343 ,  H04N21/2383 ,  H04N21/438 ,  H04N21/63 ,  H04L1/00 ,  H04L7/00

CPC分类号： H04N19/89 ,  H03M13/6522 ,  H04L1/004 ,  H04L1/0086 ,  H04L7/0008 ,  H04N19/29 ,  H04N19/39 ,  H04N19/46 ,  H04N19/70 ,  H04N21/234327 ,  H04N21/2383 ,  H04N21/4382 ,  H04N21/631

摘要： A forward error correction (FEC) data generator has an input for at least two datastreams for which FEC data shall be generated in a joint manner, each datastream having a plurality of symbols. A FEC data symbol is based on a FEC source block possibly having a subset of symbols of the at least two data streams. The FEC data generator further has a signaling information generator configured to generate signaling information for the FEC data symbol regarding which symbols within the at least two datastreams belong to the corresponding source block by determining pointers to start symbols within a first and a second datastream, respectively, of the at least two datastreams and a number of symbols within the first datastream and second datastreams, respectively, that belong to the corresponding source block.

公开(公告)号：EP1908300B1

公开(公告)日：2018-05-16

申请号：EP06772266.0

申请日：2006-06-06

申请人： Thomson Licensing DTV

发明人： WU, Zhenyu ,  LANDAIS, Frederic ,  PANDIT, Purvin, Bibhas ,  BOYCE, Jill MacDonald

IPC分类号： H04N19/89

CPC分类号： H04N19/159 ,  H04N19/577 ,  H04N19/895

摘要： There are provided method and apparatus for detecting and concealing reference and non-reference video frames. A video decoder includes an entropy decoder, an error detector, and an error concealer. The entropy decoder is for decompressing a video bitstream intended to have a fixed frame rate and parsing the decompressed video bitstream to find picture order counts for frames of the decompressed video bitstream. The error detector is for determining that a particular frame of the decompressed video bitstream is missing based upon the picture order counts. The error concealer is for concealing the particular frame. The method is accomplished by decompressing and parsing the video bitstream to find picture order counts for frames of the decompressed video bitstream and then determining that a particular frame of the decompressed video bitstream is missing based upon comparison of their associated picture order counts, and then concealing that particular frame.

公开(公告)号：EP3122043B1

公开(公告)日：2018-01-17

申请号：EP16177498.9

申请日：2008-11-04

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： LINDEGREN, David ,  PETTERSSON, Martin ,  GUSTAFSSON, Jörgen

IPC分类号： H04N17/00 ,  H04N19/154 ,  H04N19/159 ,  H04N19/46 ,  H04N19/513 ,  H04N19/66 ,  H04N19/89 ,  H04L12/26

CPC分类号： H04N19/66 ,  H04L43/0835 ,  H04N17/004 ,  H04N19/154 ,  H04N19/159 ,  H04N19/46 ,  H04N19/521 ,  H04N19/89

摘要： A method is provided for determining a quality value (Q) of a video stream (S), comprising the steps of: identifying lost data packets (3, 4, 7, 8, 9) of the video stream (S); identifying at least two intra coded frames (11, 12, 13, 14) of the video stream (S); determining intra coded frames (11, 12, 14) having a maintained image quality, based on estimating (45) if a lost data packet (9) is associated with an intra coded frame (13); estimating a distance (D1; D2; D3; D4; D5) between each one of the lost data packets (3; 4; 7; 8; 9) and a next respective, subsequent intra coded frame (12; 14) having a maintained image quality; and generating the quality value (Q), based on the distances (D1, D2, D3, D4, D5). A system and a computer readable medium are also described.

公开(公告)号：EP3203733A1

公开(公告)日：2017-08-09

申请号：EP16193850.1

申请日：2013-08-19

申请人： Huawei Technologies Co., Ltd.

发明人： GAO, Shan ,  ZHANG, Lei ,  SUN, Lina

IPC分类号： H04N17/00 ,  H04N21/44 ,  H04L12/26 ,  H04N19/105 ,  H04N19/172 ,  H04N19/115 ,  H04N19/61 ,  H04N19/103 ,  H04N19/89 ,  H04N19/85 ,  H04N21/6437

CPC分类号： H04N19/89 ,  H04L43/0835 ,  H04N17/004 ,  H04N19/103 ,  H04N19/115 ,  H04N19/61 ,  H04N19/85 ,  H04N21/44008 ,  H04N21/6437

摘要： Embodiments of the present invention provide frame type detection and frame size detection methods and apparatuses for a video stream. The video frame type detection method includes: obtaining a size of a current video frame, where the current video frame is located after the first video frame of the video stream; obtaining a change feature value of the current video frame according to the current video frame and a size of a previous first video frame adjacent to the current video frame; obtaining an I-frame threshold of the current video frame according to a video frame rate and a location of the current video frame; and determining whether the previous first video frame is an I frame according to the change feature value of the current video frame and a change feature value of the previous first video frame, the I-frame threshold of the current video frame, and the size of the current video frame, the size of the previous first video frame, and a size of a previous second video frame. The present invention provides a complete and effective frame type detection method, and therefore only one video frame before a previous first video frame is considered during detection of a frame type of the previous first video frame; in addition, impact of a video frame rate is fully considered.

摘要翻译： 本发明的实施例提供了用于视频流的帧类型检测和帧大小检测方法和装置。 所述视频帧类型检测方法包括：获取所述当前视频帧位于所述视频流的第一视频帧之后的当前视频帧的大小; 根据当前视频帧和与当前视频帧相邻的前一个第一视频帧的大小，获取当前视频帧的变化特征值; 根据视频帧率和当前视频帧的位置，获取当前视频帧的I帧阈值; 根据当前视频帧的变化特征值和前一个第一视频帧的变化特征值，当前视频帧的I帧阈值以及当前视频帧的大小，确定前一个第一视频帧是否为I帧。 当前视频帧，前一个第一视频帧的大小以及前一个第二视频帧的大小。 本发明提供了一种完整有效的帧类型检测方法，因此在检测前一个第一视频帧的帧类型时，只考虑前一个第一视频帧之前的一个视频帧; 另外，充分考虑了视频帧率的影响。

公开(公告)号：EP3087745A4

公开(公告)日：2017-06-28

申请号：EP14873838

申请日：2014-03-12

申请人： INTEL CORP

发明人： PURI ATUL ,  GOKHALE NEELESH

IPC分类号： H04N19/527 ,  H04N19/513 ,  H04N19/537 ,  H04N19/89

CPC分类号： H04N19/44 ,  H04N19/119 ,  H04N19/12 ,  H04N19/122 ,  H04N19/136 ,  H04N19/147 ,  H04N19/172 ,  H04N19/176 ,  H04N19/46 ,  H04N19/513 ,  H04N19/527 ,  H04N19/537 ,  H04N19/573 ,  H04N19/61 ,  H04N19/82 ,  H04N19/85 ,  H04N19/91

摘要： A computer-implemented method for video coding comprising obtaining frames of pixel data and having a current frame and a decoded reference frame to use as a motion compensation reference frame for the current frame, forming a warped global compensated reference frame by displacing at least one portion of the decoded reference frame by using global motion trajectories, determining a motion vector indicating the motion of the at least one portion and motion from a position based on the warped global compensated reference frame to a position at the current frame, and forming a prediction portion based, at least in part, on the motion vectors and corresponding to a portion on the current frame.

摘要翻译： 一种用于视频编码的计算机实现的方法，包括：获得像素数据帧并使当前帧和解码参考帧用作当前帧的运动补偿参考帧;通过移位至少一部分来形成变形全局补偿参考帧 通过使用全局运动轨迹来确定指示所述至少一个部分的运动的运动矢量和从基于所述变形的全局补偿参考帧的位置到当前帧处的位置的运动，并且形成预测部分 至少部分地基于运动矢量并且对应于当前帧上的一部分。