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公开(公告)号：US20230121486A1
公开(公告)日：2023-04-20
申请号：US17914096
申请日：2021-03-22
发明人： Naël OUEDRAOGO , Patrice ONNO , Guillaume LAROCHE
IPC分类号： H04N19/70 , H04N19/426 , H04N19/169 , H04N19/172
摘要： A sequence of images is encoded in a bitstream as a series of picture units PU-01˜03. Each picture unit corresponds to one encoded image and includes one or more network abstraction layer (NAL) units NAL-01˜23. The NAL units may be video coding layer (VCL) NAL units which each contain encoded image data or adaptation parameter set NAL units which each contain an adaptation parameter set (APS) having parameters for performing one or more types of processing operation on the image data contained in one or more VCL NAL units. The APS NAL units may be prefix APS NAL units P-APS or suffix APS NAL units S-APS. An additional constraint is applied to the bitstream prohibiting inclusion, in a picture unit, of a prefix APS NAL unit after the first NAL unit of the picture unit concerned. This can avoid more than one APS applying to slices belonging to the same picture unit, and hence reduce the size of an APS buffer. Alternatively, or in addition, it is permitted to include, in the same picture unit, of a prefix APS NAL unit and a suffix APS NAL unit having the same APS type and the same APS identifier but different contents. This can reduce rewriting operations when performing random access decoding at a specific timing in the coded video sequence.
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公开(公告)号：US20220360804A1
公开(公告)日：2022-11-10
申请号：US17752677
申请日：2022-05-24
IPC分类号： H04N19/46 , H04N19/105 , H04N19/13 , H04N19/176
摘要： The invention relates to signalling affine mode in an encoded video stream; in particular determining a list of merge candidates corresponding to blocks neighbouring a current block; and signalling affine mode for said current block; wherein signalling said affine mode comprises decoding a context encoded flag from the data stream, and wherein the context variable for said flag is determined based on whether or not said neighbouring blocks use affine mode. Related encoding and decoding methods and devices are also disclosed.
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公开(公告)号：US20220094989A1
公开(公告)日：2022-03-24
申请号：US17541058
申请日：2021-12-02
IPC分类号： H04N19/82 , H04N19/117 , H04N19/14 , H04N19/176 , H04N19/182 , H04N19/86
摘要： A method of filtering a block of pixels in an image, comprising obtaining a first clipping control parameter (tc) value based on a quantization parameter of the block; comparing a first value of a first pixel located on one side of an edge in said block and a second value of a second pixel located on the other side of the edge in said block with a predetermined threshold derived from the first clipping control parameter value; and determining whether to apply a strong filtering to the first pixel based on the result of the comparison, wherein: the strong filtering comprises filtering the first pixel value so that the filtered first pixel value differs from the first pixel value by no more than a range value based on the clipping control parameter (tc), the ration between two range values corresponding to successive values of bitdepths being strictly lower than 2.
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公开(公告)号：US20210352275A1
公开(公告)日：2021-11-11
申请号：US17283163
申请日：2019-10-18
IPC分类号： H04N19/105 , H04N19/13 , H04N19/70 , H04N19/176
摘要： A method of encoding a motion information predictor index, comprising: generating a list of motion information predictor candidates; when an Affine Merge mode is used, selecting one of the motion information predictor candidates in the list as an Affine Merge mode predictor; when a non-Affine Merge mode is used, selecting one of the motion information predictor candidates in the list as a non-Affine Merge mode predictor; and generating a motion information predictor index for the selected motion information predictor candidate using CABAC coding, one or more bits of the motion information predictor index being bypass CABAC coded.
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公开(公告)号：US20140301487A1
公开(公告)日：2014-10-09
申请号：US14245867
申请日：2014-04-04
IPC分类号： H04N19/86 , H04N19/117 , H04N19/34 , H04N19/82
CPC分类号： H04N19/14 , H04N19/117 , H04N19/176 , H04N19/34 , H04N19/82 , H04N19/86
摘要： A method and a device for classifying samples of an image, each sample having a respective sample value the method comprising repartition of each of the samples into a plurality of index classes, wherein the index class allocated to each sample is determined in dependence upon the sample value of the said sample with respect to the sample values of first neighbouring samples of said sample according to a given direction and further in respect to the sample values of the first neighbouring samples with respect to the sample values of samples neighbouring the first neighbouring samples according to the said given direction. Processing each sample according to the respective allocated index class.
摘要翻译： 一种用于对图像的样本进行分类的方法和装置，每个样本具有相应的样本值，所述方法包括将每个样本重新划分为多个索引类别，其中分配给每个样本的索引类别根据样本来确定 所述样本相对于所述样本的第一相邻样本的样本值根据给定方向的值，并且关于相对于与第一相邻样本相邻的样本的采样值相对于第一相邻样本的样本值， 到所说的方向。 根据各自分配的索引类处理每个样本。
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公开(公告)号：US20210344943A1
公开(公告)日：2021-11-04
申请号：US17283168
申请日：2019-10-18
IPC分类号： H04N19/513 , H04N19/70 , H04N19/44 , H04N19/13
摘要： A method of encoding a motion information predictor index for an Affine Merge mode, comprising: generating a list of motion information predictor candidates; selecting one of the motion information predictor candidates in the list as an Affine Merge mode predictor; and generating a motion information predictor index for the selected motion information predictor candidate using CABAC coding, one or more bits of the motion information predictor index being bypass CABAC coded.
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7.发明申请公开(公告)号：US20200221097A1
公开(公告)日：2020-07-09
申请号：US16626253
申请日：2018-06-22
IPC分类号： H04N19/137 , H04N19/52 , H04N19/119 , H04N19/176
摘要： The present disclosure concerns a method and a device for encoding or decoding video data. It concerns more particularly the encoding according to a particular encoding mode using a decoder side motion vector derivation mode referenced as frame-rate up conversion mode or FRUC mode. It concerns encoding and decoding improvement which reduce the need for memory accesses when using an encoding mode where the motion information is predicted using a decoder side motion vector derivation method.
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公开(公告)号：US20190014338A1
公开(公告)日：2019-01-10
申请号：US16039206
申请日：2018-07-18
发明人： Guillaume LAROCHE , Patrice ONNO
IPC分类号： H04N19/503 , H04N19/593 , H04N19/46
摘要： A temporal motion vector predictor is includable, together with one or more spatial motion vector predictors, in a set of motion vector predictors for a block to encode of a current frame. A method of determining the temporal motion vector predictor comprises selecting as the temporal predictor one motion vector from among motion vectors in a reference block of a reference frame different from the current frame. The reference block is a block of the reference frame collocated with the block to encode or a block of the reference frame neighboring the collocated block. The selection is based on a diversity criterion for achieving diversity among the predictors of the set. This can reduce the motion vector memory requirements with no or no significant additional coding efficiency penalty. Alternatively, even if the motion vector memory is not reduced in size, coding efficiency improvements can be achieved.
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公开(公告)号：US20180302644A1
公开(公告)日：2018-10-18
申请号：US16013744
申请日：2018-06-20
IPC分类号： H04N19/52 , H04N19/31 , H04N19/463
摘要： The invention concerns a method, device, and computer program for motion vector prediction in scalable video encoder and decoder.It concerns the process to determine motion information predictor in the enhancement layer of a scalable encoding scheme also known as motion derivation process. It comprises a correction of the position in the reference layer used to pick-up the more relevant motion information available due to the compression scheme. Accordingly, motion information prediction is improved.
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10.发明申请公开(公告)号：US20160057419A1
公开(公告)日：2016-02-25
申请号：US14782301
申请日：2014-03-24
IPC分类号： H04N19/124 , H04N19/186 , H04N19/463 , H04N19/17
CPC分类号： H04N19/124 , H04N19/162 , H04N19/17 , H04N19/186 , H04N19/463
摘要： The value of a quantization parameter for at least one second color component of an image or image portion is determined using a current color format among several possible color formats. The determination comprises the steps of selecting at least one function associated with a possible color format, and determining the value of the quantization parameter for the second color component by applying said at least one function to a value of an intermediate quantization parameter which is based on the value of the quantization parameter of the first color component of the image or image portion. The at least one function is selected independently from the current color format.
摘要翻译： 使用几种可能的颜色格式中的当前颜色格式来确定图像或图像部分的至少一个第二颜色分量的量化参数的值。 确定包括以下步骤：选择与可能的颜色格式相关联的至少一个功能，以及通过将所述至少一个功能应用于基于以下的中间量化参数的值来确定第二颜色分量的量化参数的值 图像或图像部分的第一颜色分量的量化参数的值。 独立于当前颜色格式选择至少一个功能。
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