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公开(公告)号：US20240298021A1
公开(公告)日：2024-09-05
申请号：US18663498
申请日：2024-05-14
发明人： SACHIN G. DESHPANDE , Eiichi Sasaki , Takeshi Chujoh , Yukinobu Yasugi , Tomohiro Ikai , Tomoko Aono
IPC分类号： H04N19/436 , H04N19/119 , H04N19/167 , H04N19/174 , H04N19/96
CPC分类号： H04N19/436 , H04N19/119 , H04N19/167 , H04N19/174 , H04N19/96
摘要： A non-transitory machine-readable medium of an electronic device that stores one or more computer-executable instructions is provided. The one or more computer-executable instructions, when executed by at least one processing unit of the electronic device, cause the electronic device to: decode a wavefront parallel processing (WPP) enabled flag that indicates whether a rectangular tile or a coding tree unit (CTU) row having a height of one CTU exists in a segment in an object tile group; and decode an end bit of the segment. When the WPP enabled flag is 1, after decoding a CTU at a right end of the CTU row, an end bit of a first segment having a first fixed value is decoded. When the WPP enabled flag is 0, after decoding a CTU at a bottom right of a tile, an end bit of a second segment having a second fixed value is decoded.
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公开(公告)号：US11825111B2
公开(公告)日：2023-11-21
申请号：US18070706
申请日：2022-11-29
发明人： Takeshi Chujoh , Tomonori Hashimoto , Tomoko Aono , Tomohiro Ikai
IPC分类号： H04N19/105 , H04N19/159 , H04N19/172 , H04N19/513
CPC分类号： H04N19/513 , H04N19/105 , H04N19/159 , H04N19/172
摘要： A moving image decoding method for generating prediction images by a device is provided. First and second prediction image are generated. Bidirectional prediction gradient change prediction processing is performed by using a first shift value and difference values of horizontally neighboring samples and vertically neighboring samples in the first and second prediction images to generate a first, second, third and fourth gradient images. Motion information is derived by using the first and second prediction images, the first, second, third and fourth gradient images, a second shift value, and a third shift value. Motion compensation correction value is derived by using the motion information and the first, second, third and the fourth gradient images. The third prediction image is generated by using the first and second prediction images and the motion compensation correction value. The first, second and third shift values are derived based on a pixel bit length of eight.
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公开(公告)号：US11653016B2
公开(公告)日：2023-05-16
申请号：US17298177
申请日：2019-12-11
发明人： Takeshi Chujoh , Tomonori Hashimoto , Tomoko Aono , Tomohiro Ikai
IPC分类号： H04N19/513 , H04N19/105 , H04N19/159 , H04N19/172
CPC分类号： H04N19/513 , H04N19/105 , H04N19/159 , H04N19/172
摘要： A prediction image generation method using two prediction images to generate a prediction image by a device is provided. First and second prediction image are generated. Bidirectional prediction gradient change prediction processing is performed by using a first shift value and difference values of the first and second prediction images respectively in horizontal and vertical directions to generate a first, second, third and fourth gradient images. Motion information is derived by using the first and second prediction images, the first, second, third and fourth gradient images, a second shift value, and a third shift value. Motion compensation correction value is derived by using the motion information and the first, second, third and the fourth gradient images. The prediction image is generated by using the first and second prediction images and the motion compensation correction value. The first, second and third shift values are respectively equal to 6, 4 and 1.
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公开(公告)号：US11451825B2
公开(公告)日：2022-09-20
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 , H04N19/105 , 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：US10778976B2
公开(公告)日：2020-09-15
申请号：US16336242
申请日：2017-08-24
发明人： Tomohiro Ikai , Tomoko Aono
IPC分类号： H04N19/119 , H04N19/50 , H04N19/70 , H04N19/127 , H04N19/176 , H04N19/159 , H04N19/157
摘要： An image decoding apparatus (31) includes a CT information decoding unit (10) configured, in each coding tree, to decode a constraint flag indicating whether or not to constrain decoding a prediction unit, and a CU decoding unit (20) configured, in the coding tree, to decode a prediction unit in a coding node to be decoded first and to not decode a prediction unit in another coding node, in a case that the constraint flag indicates constraint of decoding the prediction unit. According to the present invention, it is possible to reduce a coding amount of PU and complexity of coding/decoding an image while maintaining a split with a high degree of freedom by CT split (QT split and BT split).
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公开(公告)号：US20240114155A1
公开(公告)日：2024-04-04
申请号：US18532042
申请日：2023-12-07
发明人： TAKESHI CHUJOH , Yukinobu Yasugi , Eiichi Sasaki , Tomoko Aono , Tomohiro Ikai
IPC分类号： H04N19/169 , H04N19/107 , H04N19/172 , H04N19/70
CPC分类号： H04N19/188 , H04N19/107 , H04N19/172 , H04N19/70 , H04N19/167
摘要： A method for signaling gradual refresh for encoding a set of pictures performed by an electronic device is provided. The method identifies a first picture in the set of pictures as being associated with a gradual refreshed picture, and stores a network abstraction layer (NAL) unit type in a coded stream associated with the first picture. The NAL unit type identifies a presence of the gradual refreshed picture. The method then stores, in the coded stream, an enable flag to identify a use of the gradual refresh for encoding at least a subset of pictures in the set of pictures.
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公开(公告)号：US11671620B2
公开(公告)日：2023-06-06
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 , H04N19/56 , H04N19/176
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：US11641479B2
公开(公告)日：2023-05-02
申请号：US17311302
申请日：2019-12-02
发明人： Tianyang Zhou , Tomohiro Ikai , Eiichi Sasaki , Yukinobu Yasugi
IPC分类号： H04N19/44 , H04N19/119 , H04N19/176 , H04N19/186 , H04N19/96
摘要： In conventional cases that different trees are used between luma and chroma and that luma chroma prediction including multiplication in chroma intra prediction is used, there is a problem in that a processing delay caused by the chroma intra prediction is increased in small blocks. In a case that two different trees are used between luma and chroma, in a case of an 8×8 block in a luma size, 0 is derived without decoding qt_split_cu_flag, and in a case of an 8×4/4×8 block in a luma size, 0 is derived without decoding mtt_split_cu_flag. In a case that the size of a target block is smaller than a prescribed size, a chroma intra mode is derived from any one of DC, leftward prediction, and upward prediction.
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公开(公告)号：US11212551B2
公开(公告)日：2021-12-28
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 , H04N19/56 , H04N19/176
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：US12028541B2
公开(公告)日：2024-07-02
申请号：US18132032
申请日：2023-04-07
发明人： Sachin G. Deshpande , Eiichi Sasaki , Takeshi Chujoh , Yukinobu Yasugi , Tomohiro Ikai , Tomoko Aono
IPC分类号： H04N19/436 , H04N19/119 , H04N19/167 , H04N19/174 , H04N19/96
CPC分类号： H04N19/436 , H04N19/119 , H04N19/167 , H04N19/174 , H04N19/96
摘要： A moving image decoding method is provided for decoding encoded data of a tile group generated by splitting a picture into one or more rectangular regions. The tile group includes one or more segments. The moving image decoding method includes decoding a wavefront parallel processing (WPP) enabled flag indicating whether a rectangular tile or a coding tree unit (CTU) row having a height of one CTU exists in a segment in an object tile group; and decoding an end bit of the segment. When the WPP enabled flag is 1, after decoding a CTU at a right end of the CTU row, an end bit of a first segment having a first fixed value is decoded. When the WPP enabled flag is 0, after decoding a CTU at a bottom right of a tile, an end bit of a second segment having a second fixed value is decoded.
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