GENERALIZED BI-PREDICTION FOR VIDEO CODING WITH REDUCED CODING COMPLEXITY

    公开(公告)号:WO2019147628A1

    公开(公告)日:2019-08-01

    申请号:PCT/US2019/014691

    申请日:2019-01-23

    CPC classification number: H04N19/577 H04N19/31 H04N19/573

    Abstract: Exemplary embodiments include systems and methods for coding a video comprising a plurality of pictures including a current picture, a first reference picture, and a second reference picture, where each picture includes a plurality of blocks. In one method, for at least a current block in the current picture, a number of available bi-prediction weights is determined based at least in part on a temporal layer and/or a quantization parameter of the current picture. From among available bi-prediction weights a pair of weights are identified. Using the identified weights, the current block is then predicted as a weighted sum of a first reference block in the first reference picture and a second reference block in the second reference picture. Encoding techniques are also described for efficient searching and selection of a pair of bi-prediction weights to use for prediction of a block.

    PROCÉDÉS ET DISPOSITIFS DE CODAGE ET DE DÉCODAGE D'UNE SÉQUENCE VIDÉO MULTI-VUES REPRÉSENTATIVE D'UNE VIDÉO OMNIDIRECTIONNELLE

    公开(公告)号:WO2019115899A1

    公开(公告)日:2019-06-20

    申请号:PCT/FR2018/052978

    申请日:2018-11-26

    Applicant: ORANGE

    Abstract: L'invention concerne un procédé et un dispositif de décodage d'un signal de données codées représentatif d'une séquence vidéo multi-vues représentative d'une vidéo omnidirectionnelle, la séquence vidéo multi-vues comprenant au moins une première vue et une deuxième vue. Des paramètres permettant d'obtenir (61 ) une matrice homographique représentative de la transformation d'un plan de la deuxième vue vers un plan de la première vue, sont lus (60) dans le signal. Une image de la deuxième vue comprend une zone dite active comprenant des pixels qui lorsque lesdits pixels sont projetés via la matrice homographique sur une image de la première vue, sont compris dans l'image de la première vue. Une image de la deuxième vue est décodée (62) par la génération (620) d'une image de référence comprenant des valeurs de pixels déterminées à partir de pixels précédemment reconstruits d'une image de la première vue et de la matrice homographique, et pour au moins un bloc de l'image de la deuxième vue, l'image de référence générée est comprise dans ladite liste d'images de référence lorsque ledit bloc appartient (622) à la zone active. Ledit bloc est reconstruit (625) à partir d'une image de référence indiquée par un index lu (621 ) dans le signal de données.

    METHOD AND APPARATUS FOR WEIGHTED PREDICTION IN VIDEO CODING

    公开(公告)号:WO2019001685A1

    公开(公告)日:2019-01-03

    申请号:PCT/EP2017/065738

    申请日:2017-06-26

    Inventor: PINTO, Luis

    CPC classification number: H04N19/105 H04N19/174 H04N19/573

    Abstract: There is provided a method of encoding video using motion compensation, the method comprising determining a motion vector that defines a transformation from a reference picture, the method comprising using bi-prediction encoding referencing a first and second list of references (L0, L1). The method is characterized in that the first reference list includes a reference created by applying a first weighting to a first picture, and the second reference list includes a reference created by applying a second weighting to said first picture.

    PICTURE ORDER COUNT BASED MOTION VECTOR PRUNING
    7.
    发明申请
    PICTURE ORDER COUNT BASED MOTION VECTOR PRUNING 审中-公开
    基于图片订单计数的运动矢量剪枝

    公开(公告)号:WO2017142875A1

    公开(公告)日:2017-08-24

    申请号:PCT/US2017/017827

    申请日:2017-02-14

    Abstract: In general, this disclosure described techniques for pruning a list of motion vector prediction candidates based on picture order count (POC) values. A video coding device may be configured to generate the list of motion vector prediction candidates for a prediction unit (PU) of video data. The video coding device may prune a first motion vector prediction candidate from the list of motion vector prediction candidates when a POC value for a reference picture identified by the first motion vector prediction candidate is equal to a second POC value of a reference picture identified by a second motion vector prediction candidate in the list of motion vector prediction candidates. The video coding device may code the PU using the pruned list.

    Abstract translation: 一般而言,本发明描述用于基于图片次序计数(POC)值修剪运动向量预测候选者的列表的技术。 视频译码装置可经配置以产​​生视频数据的预测单元(PU)的运动向量预测候选者的列表。 当由第一运动向量预测候选所识别的参考图片的POC值等于由第一运动向量预测候选所识别的参考图片的第二POC值时,视频译码装置可从运动向量预测候选者的列表中剪除第一运动向量预测候选者 运动矢量预测候选列表中的第二运动矢量预测候选。 视频编码设备可以使用剪除的列表来编码PU。

    METHODS AND DEVICES FOR ENCODING AND DECODING VIDEO PICTURES
    8.
    发明申请
    METHODS AND DEVICES FOR ENCODING AND DECODING VIDEO PICTURES 审中-公开
    用于编码和解码视频图像的方法和设备

    公开(公告)号:WO2017142448A1

    公开(公告)日:2017-08-24

    申请号:PCT/SE2016/050122

    申请日:2016-02-17

    Abstract: A method (20) is disclosed performed in an encoder (40) for encoding video pictures into a video bit stream, the method (20) comprising: obtaining (21) a transformed version (2'; 12', 13') of a reference picture (2; 12, 13), by using a geometric transformation comprising at least one of: scaling, rotation, shearing, reflection, and projection; performing (22) a matching procedure at least once, the matching procedure comprising matching a reference matching area (6; 15, 16) of the reference picture (2; 12, 13) to a matching area (4; 16, 15) of a second picture (1; 13, 12) and matching a reference matching area (6'; 15', 16') of the transformed version (2'; 12', 13') to the matching area (4; 16, 15) of the second picture (1; 13, 12); and encoding (23) a block (3; 14) of the current picture (1; 11) by selecting for the block (3; 14) a first prediction area (5; 15, 16) based on the reference matching area (6; 15, 16) or a second prediction area (5'; 15', 16') based on the transformed reference matching area (6'; 15', 16'), wherein the first and second prediction areas at least partly overlap the respective reference matching areas (6; 6'; 15, 16, 15', 16') and wherein the prediction area having lowest matching error to a corresponding matching area (4; 15, 16) of the second picture (1; 13, 12) is selected as prediction for the block. A corresponding method (30) in a decoder (50) is disclosed, and encoder (40), decoder (50), computer programs and computer program products.

    Abstract translation: 公开了一种在编码器(40)中执行的用于将视频图片编码成视频比特流的方法(20),所述方法(20)包括:获得(21)经变换的版本(2' 通过使用包括缩放,旋转,剪切,反射和投影中的至少一个的几何变换来确定参考图片(2; 12,13)的位置(例如,12',13' 执行(22)匹配过程至少一次,所述匹配过程包括将所述参考图片(2; 12,13)的参考匹配区域(6; 15,16)与所述参考图片(2; 12,13)的匹配区域(4; 16,15)进行匹配 (2; 12',13')的参考匹配区域(6'; 15',16')与匹配区域(4; 16,15)相匹配的第二图片 )的第二图片(1; 13,12); 以及通过基于所述参考匹配区域(6; 6)为所述块(3; 14)选择第一预测区域(5; 15,16),对所述当前图片(1; 11)的块 ;基于所述变换后的参考匹配区域(6'; 15',16'),所述第一预测区域和所述第二预测区域(5'; 15',16')或第二预测区域 (1; 13,16)的相应匹配区域(4; 15,16)具有最低匹配误差的预测区域(6; 6'; 15,16,15',16' 12)被选为块的预测。 公开了解码器(50)中的相应方法(30),以及编码器(40),解码器(50),计算机程序和计算机程序产品。

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