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11. 发明授权

US11589056B2 Video decoding apparatus and video coding apparatus 有权
公开(公告)号：US11589056B2
公开(公告)日：2023-02-21
申请号：US17486592
申请日：2021-09-27
申请人： Sharp Kabushiki Kaisha
发明人： Yukinobu Yasugi , Eiichi Sasaki , Tomohiro Ikai , Tomoko Aono
IPC分类号： H04N19/59 , H04N19/159 , H04N19/132 , H04N19/176 , H04N19/426
摘要： A video decoding apparatus includes matrix reference pixel derivation circuitry that derives reference samples by using top neighboring samples and left neighboring samples of a current block, weight matrix derivation circuitry that derives a weight matrix, matrix prediction image derivation circuitry that derives a prediction image, and matrix prediction image interpolation circuitry that derives a predicted image by using the prediction image. A size index is derived according to a value of a target block width and a value of a target block height. A prediction size is derived using the size index. In a case that a first condition, that both the value of the transform block width and the value of the transform block height are equal to 4, is true, the size index is set equal to 0 and the prediction size is set equal to 4.

12. 发明授权

US11451825B2 Cross-component linear model prediction image generation apparatus, video decoding apparatus, video coding apparatus, and prediction image generation method 有权
公开(公告)号：US11451825B2
公开(公告)日：2022-09-20
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 , H04N19/105 , 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.

13. 发明授权

US11303927B2 Video decoding apparatus and video coding apparatus 有权
公开(公告)号：US11303927B2
公开(公告)日：2022-04-12
申请号：US17201627
申请日：2021-03-15
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： H04N19/577 , H04N19/59 , H04N19/176 , H04N19/159 , H04N19/46 , H04N19/105
摘要： An apparatus includes an inter prediction unit configured to decode multiple reference picture list structures and to select one reference picture list structure from the multiple reference picture list structures on a per picture basis or on a per slice basis, wherein in the multiple reference picture list structures, the number of all reference pictures is one or more.

14. 发明授权

US11128891B2 Image decoding apparatus and image coding apparatus 有权
公开(公告)号：US11128891B2
公开(公告)日：2021-09-21
申请号：US17087654
申请日：2020-11-03
申请人： Sharp Kabushiki Kaisha
发明人： Tomonori Hashimoto , Tomohiro Ikai , Tomoko Aono
IPC分类号： H04N11/02 , H04N19/60 , H04N19/176 , H04N19/186
摘要： An image decoding apparatus decodes a transform coefficient on a transform unit basis, decodes a flag scaling_matrix_for_lfnst_disabled_flag indicating whether to apply a quantization matrix during a non-separable transform, scales the transform coefficient by utilizing a scaling list, and performs a non-separable transform in accordance with a non-separable transform index lfnst_idx. In a case that scaling_matrix_for_lfnst_disabled_flag==1 and lfnst_idx !=0 and a size of a transform block is equal to or greater than a prescribed size, instead of scaling using the quantization matrix according to a position of the transform coefficient, uniform quantization not depending on the position of the transform coefficient is performed.

15. 发明授权

US11044493B2 Prediction image generation device, moving image decoding device, and moving image coding device 有权
公开(公告)号：US11044493B2
公开(公告)日：2021-06-22
申请号：US16074049
申请日：2017-01-26
申请人： SHARP KABUSHIKI KAISHA
发明人： Tomohiro Ikai
IPC分类号： H04N19/59 , H04N19/513 , H04N19/523 , H04N19/52 , H04N19/44
摘要： Coding efficiency is improved. A motion compensation filter unit acts on a motion vector applied image obtained by acting a motion vector on a reference image. The motion compensation filter unit causes filter coefficients mcFilter[i][k] designated by a phase i and a filter coefficient position k to act on the motion vector applied image. The filter coefficients mcFilter[i][k] includes filter coefficients calculated by using filter coefficients mcFilter[p][k] (p≠i) and filter coefficients mcFilter[q][k] (q≠i).

16. 发明授权

US10778976B2 Image decoding apparatus and image coding apparatus 有权
公开(公告)号：US10778976B2
公开(公告)日：2020-09-15
申请号：US16336242
申请日：2017-08-24
申请人： SHARP KABUSHIKI KAISHA , FG Innovation Company Limited
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).

17. 发明授权

US10743024B2 Decoding device, an encoding device, and a decoding method using a uni-prediction or bi-predition scheme for inter-frame prediction 有权
公开(公告)号：US10743024B2
公开(公告)日：2020-08-11
申请号：US16209487
申请日：2018-12-04
申请人： SHARP KABUSHIKI KAISHA
发明人： Tomoyuki Yamamoto , Tomohiro Ikai , Yukinobu Yasugi
IPC分类号： H04N7/18 , H04N19/577 , H04N19/105 , H04N19/52 , H04N19/119 , H04N19/13 , H04N19/463 , H04N19/157 , H04N19/159 , H04N19/44 , H04N19/96
摘要： To achieve a reduction in the amount of coding taken in the use of an asymmetric partition and to implement efficient encoding/decoding processes exploiting the characteristics of the asymmetric partition. An image decoding device includes a motion compensation parameter derivation unit configured to derive a motion compensation parameter indicating either a uni-prediction scheme or a bi-prediction scheme. In a case that a prediction unit has a size less than or equal to a predetermined value, the motion compensation parameter derivation unit is configured to derive the motion compensation parameter by switching between the prediction schemes.

18. 发明授权

US10630999B2 Image decoding device, image decoding method, and image encoding device 有权
公开(公告)号：US10630999B2
公开(公告)日：2020-04-21
申请号：US16118820
申请日：2018-08-31
申请人： SHARP KABUSHIKI KAISHA
发明人： Tomoyuki Yamamoto , Tomohiro Ikai , Yukinobu Yasugi
IPC分类号： H04N19/50 , H04N19/70 , H04N19/463 , H04N19/91 , H04N19/44 , H04N19/96
CPC分类号： H04N19/463 , H04N19/44 , H04N19/91 , H04N19/96
摘要： To achieve a reduction in the amount of coding taken in the use of an asymmetric partition and to implement efficient encoding/decoding processes exploiting the characteristics of the asymmetric partition. In a case that a CU information decoding unit decodes information for specifying an asymmetric partition (AMP; Asymmetric Motion Partition) as a partition type, an arithmetic decoding unit is configured to decode binary values by switching between arithmetic decoding that uses contexts and arithmetic decoding that does not use contexts in accordance with the position of the binary values.

19. 发明授权

US10306235B2 Image decoding apparatus, image coding apparatus, and prediction-vector deriving device 有权
公开(公告)号：US10306235B2
公开(公告)日：2019-05-28
申请号：US15547663
申请日：2016-01-28
申请人： SHARP KABUSHIKI KAISHA
发明人： Tomohiro Ikai , Takeshi Tsukuba
IPC分类号： H04N19/30 , H04N19/31 , H04N19/33 , H04N19/52 , H04N19/59 , H04N19/70 , H04N19/105 , H04N19/159 , H04N19/172 , H04N19/587 , H04N19/597
摘要： Motion-vector deriving processing using inter-view shift prediction according to the related art makes processing for determining a reference position complicated. In a sequence parameter set, it is not possible to independently set an ON/OFF flag of a texture extension tool and an ON/OFF flag of a depth extension tool. Additionally, even in a case in which only one of an intra SDC wedge segmentation flag IntraSdcWedgeFlag and an intra contour segmentation flag IntraContourFlag is 1, depth_intra_mode_flag for selecting one of the wedge segmentation mode and the contour segmentation mode is unnecessarily decoded.A prediction-vector deriving device derives the coordinates of a reference block of an inter-view merge candidate IV from the sum of the top-left coordinates of a target block, half the size of the target block, and a disparity vector of the target block which is converted into the integer precision. In this case, the value of the sum is normalized to a multiple of 8 or a multiple of 16. The prediction-vector deriving device derives the coordinates of a reference block of an inter-view shift merge candidate IVShift from the sum of the top-left coordinates of a target block, the size of the target block, a predetermined constant of 0 to 4, and a disparity vector of the target block which is converted into the integer precision. In this case, the value of the sum is normalized to a multiple of 8 or a multiple of 16. Then, from the motion vectors positioned at the derived coordinates of the reference blocks, the prediction-vector deriving device derives a motion vector of the inter-view merge candidate IV and a motion vector of the inter-view shift merge candidate IVShift.

20. 发明授权

US10244256B2 Image decoding device 有权
公开(公告)号：US10244256B2
公开(公告)日：2019-03-26
申请号：US15517429
申请日：2015-10-06
申请人： SHARP KABUSHIKI KAISHA
发明人： Tomohiro Ikai , Takeshi Tsukuba
IPC分类号： H04N19/593 , H04N19/597 , H04N19/70 , H04N19/17 , H04N19/176 , H04N19/11
摘要： In generation of a wedgelet pattern, all the patterns are generated through a line segment drawing process and a region filling process. Therefore, there is a problem that a processing amount is large.A moving image decoding device (1) includes: a wedgelet pattern generation section (145T4) that generates a wedge pattern; a rotation pattern generation section (1465) that derives a rotation pattern by rotating the wedge pattern; a pattern storage section (1464) that adds the rotation pattern to a wedge pattern table; and a DC prediction value derivation section (145T3) that derives a prediction value of each region partitioned in the wedge pattern included in the wedge pattern table (145T5).

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