公开(公告)号：US20230188706A1

公开(公告)日：2023-06-15

申请号：US17925042

申请日：2021-05-18

申请人： Sharp Kabushiki Kaisha

发明人： Takeshi CHUJOH ,  Tomohiro IKAI ,  Tomoko AONO ,  Eiichi SASAKI ,  Tomonori HASHIMOTO ,  Tianyang ZHOU ,  Yukinobu YASUGI

IPC分类号： H04N19/105 ,  H04N19/46 ,  H04N19/174 ,  H04N19/172

CPC分类号： H04N19/105 ,  H04N19/46 ,  H04N19/174 ,  H04N19/172

摘要： In a case that two reference picture lists are selected with one index value, the reference picture lists may not be determinable depending on the number of two reference picture list structures. Provided is a prediction unit that decodes a reference picture list structure including multiple reference picture lists and selects two reference picture lists from the reference picture list structure for each picture or for each slice. The prediction unit selects two reference picture lists with one index value depending on the number of two reference picture list structures.

公开(公告)号：US20220264142A1

公开(公告)日：2022-08-18

申请号：US17627900

申请日：2020-07-21

申请人： Sharp Kabushiki Kaisha

发明人： Tomonori HASHIMOTO ,  Eiichi SASAKI ,  Tomohiro IKAI ,  Tomoko AONO

IPC分类号： H04N19/52 ,  H04N19/70

摘要： An image decoding apparatus is provided that selectively uses a merge mode in a case that an MMVD mode is not available, thus achieving high coding efficiency. The image decoding apparatus includes a parameter decoder, and in a case that a regular merge flag indicates a regular merge mode, checks a flag indicating whether an MMVD prediction signalled in a sequence parameter set or the like is available, and in a case that the MMVD prediction is not available, decodes motion vector information obtained from a merge candidate.

公开(公告)号：US20220070491A1

公开(公告)日：2022-03-03

申请号：US17413677

申请日：2019-12-17

申请人： Sharp Kabushiki Kaisha ,  FG Innovation Company Limited

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.

公开(公告)号：US20240348819A1

公开(公告)日：2024-10-17

申请号：US18754632

申请日：2024-06-26

申请人： Sharp Kabushiki Kaisha

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

CPC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.

公开(公告)号：US20240187646A1

公开(公告)日：2024-06-06

申请号：US18437897

申请日：2024-02-09

申请人： Sharp Kabushiki Kaisha

发明人： Yukinobu YASUGI ,  Eiichi SASAKI ,  Tomohiro IKAI ,  Tomoko AONO

IPC分类号： H04N19/593 ,  H04N19/105 ,  H04N19/186 ,  H04N19/80

CPC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.

公开(公告)号：US20220167002A1

公开(公告)日：2022-05-26

申请号：US17436110

申请日：2020-03-06

申请人： Sharp Kabushiki Kaisha ,  FG Innovation Company Limited

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.

公开(公告)号：US20220038720A1

公开(公告)日：2022-02-03

申请号：US17276535

申请日：2019-09-20

申请人： Sharp Kabushiki Kaisha ,  FG Innovation Company Limited

发明人： Tomonori HASHIMOTO ,  Tomohiro IKAI ,  Takeshi CHUJOH ,  Eiichi SASAKI

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.

公开(公告)号：US20210227262A1

公开(公告)日：2021-07-22

申请号：US17264869

申请日：2019-08-06

申请人： Sharp Kabushiki Kaisha

发明人： Eiichi SASAKI ,  Yukinobu YASUGI ,  Takeshi CHUJOH ,  Tomoko AONO ,  Tomohiro IKAI

IPC分类号： H04N19/70 ,  H04N19/46 ,  H04N19/105 ,  H04N19/117 ,  H04N19/82 ,  H04N19/176

摘要： In a scheme in which only a part of one picture is intra-predicted and the rest of the region is inter-predicted, generation of a significant code amount and generation of a delay can be avoided in a specific picture. However, because only a part of the picture is coded by means of the intra prediction, coding efficiency is deteriorated as compared to an I picture in which the entire picture is coded by means of the intra prediction. A picture is split into a restricted region and a non-restricted region. Prediction is performed by using an intra prediction in which only a pixel of the restricted region is referred to or an inter prediction in which a restricted reference region of a reference picture is referred to for a block of the restricted region. Prediction is performed by using the intra prediction in which a decoded pixel in the picture is referred to or the inter prediction in which the reference picture is referred to for the block of the non-restricted region. After decoding of the picture, the restricted region is configured as the restricted reference region.

公开(公告)号：US20210084308A1

公开(公告)日：2021-03-18

申请号：US17017743

申请日：2020-09-11

申请人： Sharp Kabushiki Kaisha

发明人： Yukinobu YASUGI ,  Eiichi SASAKI ,  Tomohiro IKAI ,  Tomoko AONO

IPC分类号： H04N19/159 ,  H04N19/176 ,  H04N19/132 ,  H04N19/59 ,  H04N19/426

摘要： A video decoding apparatus includes: a matrix reference pixel derivation unit configured to derive, as a reference image, an image obtained by down-sampling an image adjacently above a target block and an image adjacently leftward of the target block; a weight matrix derivation unit configured to derive a matrix of weighting factors in accordance with an intra prediction mode and a target block size; a matrix prediction image derivation unit configured to derive a prediction image by using a product of elements of the reference image and elements of the matrix of the weighting factors; and a matrix prediction image interpolation unit deriving, as a prediction image, the prediction image or an image obtained by interpolating the prediction image, wherein the weight matrix derivation unit derives a matrix with a size of a width equal to or smaller than a width of the target block size and a height equal to or smaller than a height of the target block size.

公开(公告)号：US20240323419A1

公开(公告)日：2024-09-26

申请号：US18671059

申请日：2024-05-22

申请人： Sharp Kabushiki Kaisha

发明人： Takeshi CHUJOH ,  Eiichi SASAKI ,  Tomonori HASHIMOTO ,  Tomoko AONO ,  Tomohiro IKAI

IPC分类号： H04N19/44 ,  H04N19/105 ,  H04N19/109 ,  H04N19/139 ,  H04N19/172 ,  H04N19/52 ,  H04N19/70

CPC分类号： H04N19/44 ,  H04N19/105 ,  H04N19/109 ,  H04N19/139 ,  H04N19/172 ,  H04N19/52 ,  H04N19/70

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.