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公开(公告)号：US20220070491A1
公开(公告)日：2022-03-03
申请号：US17413677
申请日：2019-12-17
发明人： Yukinobu YASUGI , Eiichi SASAKI , Tomohiro IKAI , Tomoko AONO
IPC分类号： H04N19/593 , H04N19/186 , H04N19/80 , H04N19/105
摘要： The amount of memory required for CCLM prediction is reduced. The CCLM prediction parameter derivation unit (310442) derives a scale shift value corresponding to a luma difference value, and derives a CCLM prediction parameter, by shifting, by using the scale shift value, a value obtained by multiplying a value of a table referred to with a value obtained by performing right shift of the luma difference value by the scale shift value as an index and a chroma difference value. In addition, in a case of deriving a prediction image, a bit width is reduced by adaptively deriving a shift amount of a linear prediction parameter from the chroma difference value.
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公开(公告)号：US20220167002A1
公开(公告)日：2022-05-26
申请号：US17436110
申请日：2020-03-06
发明人： Takeshi CHUJOH , Tomoko AONO , Tomohiro IKAI , Eiichi SASAKI , Yukinobu YASUGI
IPC分类号： H04N19/513 , H04N19/105 , H04N19/172 , H04N19/46
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：US20220038720A1
公开(公告)日：2022-02-03
申请号：US17276535
申请日：2019-09-20
IPC分类号： H04N19/182 , H04N19/105
摘要： A WP prediction and a GBI prediction are adaptively used in combination. A video decoding apparatus (31) includes: a weighted prediction unit (3094) configured to generate a prediction image by using at least one of a weight coefficient or an offset configured for a first unit region and a weight coefficient configured for a second unit region different from the first unit region, the weight coefficient and the offset each being applied to a pixel value included in one or a plurality of reference images.
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公开(公告)号：US20220094973A1
公开(公告)日：2022-03-24
申请号：US17544991
申请日：2021-12-08
发明人： Takeshi CHUJOH , Tomoko AONO , Tomohiro IKAI , Eiichi SASAKI , Yukinobu YASUGI
IPC分类号： H04N19/52 , H04N19/176 , H04N19/56
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 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 configured to search for a motion vector on a prediction unit basis through matching processing. The motion vector search unit 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：US20230300365A1
公开(公告)日：2023-09-21
申请号：US18134600
申请日：2023-04-14
发明人： Takeshi CHUJOH , Tomoko AONO , Tomohiro IKAI , Eiichi SASAKI , Yukinobu YASUGI
IPC分类号： H04N19/52 , H04N19/176 , H04N19/56
CPC分类号： H04N19/52 , H04N19/176 , H04N19/56
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 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 configured to search for a motion vector on a prediction unit basis through matching processing. The motion vector search unit 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：US20210067798A1
公开(公告)日：2021-03-04
申请号：US16960108
申请日：2019-01-08
发明人： Takeshi CHUJOH , Tomoko AONO , Tomohiro IKAI , Eiichi SASAKI , Yukinobu YASUGI
IPC分类号： H04N19/52 , H04N19/176 , H04N19/56
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：US20220368944A1
公开(公告)日：2022-11-17
申请号：US17867736
申请日：2022-07-19
发明人： Yukinobu YASUGI , Eiichi SASAKI , Tomohiro IKAI , Tomoko AONO
IPC分类号： H04N19/593 , H04N19/105 , H04N19/186 , H04N19/80
摘要： The amount of memory required for CCLM prediction is reduced. The CCLM prediction parameter derivation unit (310442) derives a scale shift value corresponding to a luma difference value, and derives a CCLM prediction parameter, by shifting, by using the scale shift value, a value obtained by multiplying a value of a table referred to with a value obtained by performing right shift of the luma difference value by the scale shift value as an index and a chroma difference value. In addition, in a case of deriving a prediction image, a bit width is reduced by adaptively deriving a shift amount of a linear prediction parameter from the chroma difference value.
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公开(公告)号：US20220345734A1
公开(公告)日：2022-10-27
申请号：US17859079
申请日：2022-07-07
IPC分类号： H04N19/44 , H04N19/105 , H04N19/139 , H04N19/172 , H04N19/109 , H04N19/70 , H04N19/52
摘要： An image decoding apparatus is implemented that can suppress a decrease in coding efficiency in a case that a high compression rate is achieved. The image decoding apparatus includes a parameter decoder, and the parameter decoder decodes a skip flag indicating whether a skip mode is applied, and in a case that the skip flag does not indicate the skip mode, decodes a merge flag indicating whether a merge mode is applied, and in a case that the merge flag does not indicate the merge mode, decodes an MMVD flag indicating whether an MMVD mode is applied.
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公开(公告)号：US20220182631A1
公开(公告)日：2022-06-09
申请号：US17429024
申请日：2020-02-07
发明人： Tomohiro IKAI , Tomoko AONO , Takeshi CHUJOH , Yukinobu YASUGI , Eiichi SASAKI
IPC分类号： H04N19/13 , H04N19/70 , H04N19/174
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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公开(公告)号：US20220078431A1
公开(公告)日：2022-03-10
申请号：US17417154
申请日：2019-12-20
IPC分类号： H04N19/132 , H04N19/159 , H04N19/46 , H04N19/172
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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