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公开(公告)号：EP3846474A1
公开(公告)日：2021-07-07
申请号：EP19854434.8
申请日：2019-08-22
IPC分类号： H04N19/70
摘要： A mechanism is provided that implements video coding and decoding such that only a specific partial image region on a screen can be independently decoded. A video decoding apparatus (31) according to an aspect of the present invention configures, in intra prediction, inter prediction, loop filter processing, or the like, a partial image region in a picture, handles a region outside the partial image region in a similar manner to a region outside the picture, and does not apply such restriction to a non-partial image region other than the partial image region in the picture.
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公开(公告)号：EP4415365A3
公开(公告)日：2024-10-02
申请号：EP24185067.6
申请日：2020-03-06
IPC分类号： H04N19/577 , H04N19/70
CPC分类号： H04N19/577 , H04N19/70
摘要： An image decoding apparatus and an image coding apparatus that reduce complexity of high image quality processing are implemented. The image decoding apparatus includes an inter prediction parameter decoding processing unit that includes processing of, regarding two motion vectors, modifying the two motion vectors from an error of two prediction images. In a case that neither of the two prediction images is a case of weighted prediction, the processing of modifying the two motion vectors is performed.
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公开(公告)号：EP3937493A1
公开(公告)日：2022-01-12
申请号：EP20770286.1
申请日：2020-03-05
发明人： ZHOU, Tianyang , SASAKI, Eiichi , IKAI, Tomohiro
IPC分类号： H04N19/136 , H04N19/176 , H04N19/186 , H04N19/70 , H04N19/96
摘要： The present invention improves the performance of prediction image generation processing in an image decoding device. The image decoding device includes: a parameter decoding portion (302), decoding splitting information about splitting performed by means of a common tree structure on a luma block and a chroma block and prediction information; and a prediction image generation portion (308), generating a prediction image, wherein if the chroma block is split into blocks having a size smaller than a specified block size, then the parameter decoding portion decodes common prediction information for each block.
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公开(公告)号：EP3902260A1
公开(公告)日：2021-10-27
申请号：EP19900485.4
申请日：2019-12-20
发明人： DESHPANDE, Sachin G. , SASAKI, Eiichi , CHUJOH, Takeshi , YASUGI, Yukinobu , IKAI, Tomohiro , AONO, TOMOKO
IPC分类号： H04N19/436 , H04N19/70
摘要： In a moving image decoding device for decoding encoded data of a tile group splitting a picture into one or more rectangular regions and consisting of one or more segments, a WPP enabled flag for indicating whether a segment in an object tile group is a CTU row having a height of one CTU is decoded, and when the WPP enabled flag is 1, after a CTU at a right end of the CTU row is decoded, an end bit of a first segment having a fixed value is decoded.
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公开(公告)号：EP3896973A1
公开(公告)日：2021-10-20
申请号：EP19896606.1
申请日：2019-12-11
IPC分类号： H04N19/537
摘要： In the present invention, a prediction image generation portion for generating, from two interpolation images, a prediction image by using bidirectional gradient change processing according to a gradient change is provided. An internal bit length is configured in the prediction image generation portion. The internal bit length is configured to be less than the maximum pixel bit length that can be decoded by a decoding device. In order to control calculation accuracy of calculation of relevant parameters in each processing unit to be less than a certain value, the values of the interpolation image and a gradient prediction image are right-shifted according to the internal bit length so as to derive a correction value and generate a prediction image.
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6.发明公开
公开(公告)号：EP3739885A1
公开(公告)日：2020-11-18
申请号：EP19738425.8
申请日：2019-01-08
IPC分类号： H04N19/557 , H04N19/70
摘要： A load in processing of searching for a motion vector is reduced. In order to solve the problem described above, a motion vector derivation apparatus (3032, 3036 to 3038) according to one aspect of the present invention that derives a motion vector to be referred to for generating a prediction image to be used for coding or decoding of a video includes a motion vector search unit (30373) configured to search for a motion vector on a prediction unit basis through matching processing. The motion vector search unit (30373) is configured to stop search of the motion vector, depending on whether or not a conditional expression according to a pixel bit-depth is satisfied.
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公开(公告)号：EP4436171A2
公开(公告)日：2024-09-25
申请号：EP24194471.9
申请日：2019-09-20
IPC分类号： H04N19/159
CPC分类号： H04N19/577 , H04N19/105 , H04N19/70 , H04N19/174 , H04N19/176 , H04N19/159
摘要： An image decoding apparatus for performing image decoding processing with reference to a prediction image comprises:
a parameter decoding unit to decode an accuracy luma_log2_weight_denom of a first weight coefficient w0 and a second weight coefficient w1, a first difference value delta_luma_weight_IO[i] of w0 and a second difference value delta_luma_weight_l1[i] of w1 for a slice header from the coded data, decode reference picture indices refldxLO, refldxL1 for a coding unit CU from coded data; and
a prediction image generation unit configured to generate the prediction image Pred by using w0 and w1 of a weighted prediction according to a first formula, Clip3(0,(1 > (log2Wd+1)), wherein o0 and o1 are offsets derived from coded data,
wherein the prediction image generation unit generates Pred by deriving a first variable specified by an index i LumaWeightLO[i] according to (1-
公开(公告)号：EP3905694A1
公开(公告)日：2021-11-03
申请号：EP19906111.0
申请日：2019-12-20
IPC分类号： H04N19/577 , H04N19/70
摘要： NPL 2 describes prediction (BIO prediction) using BIO processing in which in a case that a prediction image is derived, a gradient image is utilized to achieve high image quality, and this prediction involves an assumption that pixel values are temporally constant. Thus, there is a problem in that a fade image in which a pixel value has a temporal variation or the like is not successfully processed. A bi-directional optical flow sample prediction process unit that generates a prediction image using a gradient image derived from two interpolation images derives interpolation images for determining an optical flow by using a weight coefficient and an offset coefficient decoded from coded data for weighted bi-prediction, and generates a prediction image.
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公开(公告)号：EP4415365A2
公开(公告)日：2024-08-14
申请号：EP24185067.6
申请日：2020-03-06
IPC分类号： H04N19/70
CPC分类号： H04N19/577 , H04N19/70
摘要： An image decoding apparatus and an image coding apparatus that reduce complexity of high image quality processing are implemented. The image decoding apparatus includes an inter prediction parameter decoding processing unit that includes processing of, regarding two motion vectors, modifying the two motion vectors from an error of two prediction images. In a case that neither of the two prediction images is a case of weighted prediction, the processing of modifying the two motion vectors is performed.
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公开(公告)号：EP3923581A1
公开(公告)日：2021-12-15
申请号：EP20753187.2
申请日：2020-02-07
IPC分类号： H04N19/436 , H04N19/70
摘要： Provided is a video decoding apparatus for decoding coded data of a tile group in which a picture is split into rectangular regions, the tile group being composed of segments, the video decoding apparatus including: a header decoder configured to decode the number of tiles, a WPP enabled flag, and a slice enabled flag indicating whether segments in a target tile group are rectangular tiles, CTU rows, or slices from a tile group header, wherein the header decoder is configured to decode only one of the number of tiles being two or more, the WPP enabled flag being 1, and the slice enabled flag being 1 in one tile group.
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