公开(公告)号：US11627336B2

公开(公告)日：2023-04-11

申请号：US17860485

申请日：2022-07-08

Applicant: KDDI CORPORATION

Inventor： Kyohei Unno ,  Kei Kawamura ,  Sei Naito

IPC: H04N19/57 ,  H04N19/105 ,  H04N19/513 ,  H04N19/176 ,  H04N19/182 ,  H04N19/52

Abstract: An image decoding device includes a prediction unit configured to generate a prediction signal included in a prediction block based on a motion vector. The prediction unit is configured to perform refinement processing of setting a search range based on a reference position specified by the motion vector, specifying a corrected reference position having the smallest predetermined cost from the search range, and correcting the motion vector based on the corrected reference position. When a block size of the prediction block is larger than a predetermined block size, the prediction unit is configured to divide the prediction block into sub-block groups and perform the refinement processing for each sub-block.

公开(公告)号：US11412219B2

公开(公告)日：2022-08-09

申请号：US17187025

申请日：2021-02-26

Applicant: KDDI CORPORATION

Inventor： Kyohei Unno ,  Kei Kawamura ,  Sei Naito

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/184 ,  H04N19/186 ,  H04N19/30

Abstract: An image decoding device, includes a filter unit using, as an input, a decoded signal prior to the filtering process and output a filtered decoded signal. The filter unit performs clipping processing on the decoded signal prior to the filtering process such that the absolute value of a differential value between a reference pixel value and a pixel value of the decoded signal prior to the filtering process is less than or equal to a predefined threshold value, and to generate the filtered decoded signal through the linear weighted addition of the value after the clipping processing is performed and the pixel value of the decoded signal prior to the filtering process; and a large-small relationship between the threshold value for a luma signal and the threshold value for a chroma signal are defined such that the large-small relationship is unchanged when an internal bit depth is changed.

公开(公告)号：US10356402B2

公开(公告)日：2019-07-16

申请号：US14781131

申请日：2014-03-26

Applicant: KDDI Corporation

Inventor： Kei Kawamura ,  Sei Naito

IPC: H04N19/597 ,  H04N19/119 ,  H04N19/593 ,  H04N19/154 ,  H04N19/187

Abstract: The invention relates to a video encoding device and a video decoding device, and reduces the amount of calculation when applying depth intra-prediction for depth maps, targeting textures and depth maps at respective viewpoints in a multi-view video image. Average calculations and SAD calculations are performed in respective calculation target regions partitioned by wedgelets, and a wedgelet with the minimum SAD for the block is used for prediction. Here, partitioning a target block into sub-blocks and limiting a calculation target region by determining whether to include each sub-block in a calculation target region with each wedgelet based on a region where said wedgelet passes in each sub-block enables reducing the amount of calculation.

公开(公告)号：US20160057417A1

公开(公告)日：2016-02-25

申请号：US14781131

申请日：2014-03-26

Applicant: KDDI CORPORATION

Inventor： Kei Kawamura ,  Sei Naito

IPC: H04N19/119 ,  H04N19/597 ,  H04N19/593 ,  H04N19/154 ,  H04N19/187

CPC classification number: H04N19/119 ,  H04N19/154 ,  H04N19/187 ,  H04N19/593 ,  H04N19/597

Abstract: The invention relates to a video encoding device and a video decoding device, and reduces the amount of calculation when applying depth intra-prediction for depth maps, targeting textures and depth maps at respective viewpoints in a multi-view video image. Average calculations and SAD calculations are performed in respective calculation target regions partitioned by wedgelets, and a wedgelet with the minimum SAD for the block is used for prediction. Here, partitioning a target block into sub-blocks and limiting a calculation target region by determining whether to include each sub-block in a calculation target region with each wedgelet based on a region where said wedgelet passes in each sub-block enables reducing the amount of calculation.

Abstract translation: 本发明涉及视频编码装置和视频解码装置，并且在多视点视频图像中的各个视点处对深度图应用深度帧内预测，​​针对纹理和深度图时，减少了计算量。 在由楔形块分割的相应计算目标区域中执行平均计算和SAD计算，并且使用具有该块的最小SAD的楔块进行预测。 这里，将目标块划分为子块并通过基于每个子块中所述楔块通过的区域来确定是否将每个楔形块包括在计算目标区域中的每个子块来限制计算目标区域能够减少量 的计算。

公开(公告)号：US12120353B2

公开(公告)日：2024-10-15

申请号：US17674164

申请日：2022-02-17

Applicant: KDDI CORPORATION

Inventor： Kyohei Unno ,  Kei Kawamura ,  Sei Naito

IPC: H04N19/70 ,  H04N19/139 ,  H04N19/172 ,  H04N19/174 ,  H04N19/46 ,  H04N19/50 ,  H04N19/51 ,  H04N19/82

CPC classification number: H04N19/70 ,  H04N19/139 ,  H04N19/172 ,  H04N19/174 ,  H04N19/46 ,  H04N19/50 ,  H04N19/51 ,  H04N19/82

Abstract: An image decoding device includes: a decoding unit configured to decode a first flag which is included in a slice header and controls enabling/disabling of PROF processing from encoded data; and an affine prediction signal generation unit configured to perform the PROF processing in a case where the first flag indicates that the PROF processing is enabled in a slice corresponding to the slice header, and generate a prediction signal without performing the PROF processing in a case where the first flag indicates that the PROF processing is disabled in a slice corresponding to the slice header.

公开(公告)号：US11871021B2

公开(公告)日：2024-01-09

申请号：US17873669

申请日：2022-07-26

Applicant: KDDI CORPORATION

Inventor： Kei Kawamura ,  Sei Naito

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186

CPC classification number: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186

Abstract: A decoding device includes a transformer sets a decoded luminance component of a prediction target block to the same number of samples as that of the chrominance component corresponding to the decoded luminance component of the prediction target block and generates a luminance reference signal. A specificator specifies luminance pixels having minimum and maximum pixel values of the decoded luminance component adjacent to the decoded luminance component of the prediction target block, respectively, outputs luminance pixel values obtained from specified luminance pixels, and outputs chrominance pixel values from pigment pixels corresponding to the luminance pixels. A derivator derives a linear prediction parameter from the two pixel values and a linear prediction model. A chrominance linear predictor obtains chrominance prediction signal applying the linear prediction model based on the linear prediction parameter to the luminance reference signal. The chrominance prediction and residual signals are summed to generate a reconstructed chrominance signal.

公开(公告)号：US11627311B2

公开(公告)日：2023-04-11

申请号：US17437991

申请日：2020-03-04

Applicant: KDDI CORPORATION

Inventor： Kyohei Unno ,  Kei Kawamura ,  Sei Naito

IPC: H04N19/105 ,  H04N19/139 ,  H04N19/176 ,  H04N19/513

Abstract: An image decoding device includes: a motion vector decoding unit that decodes a motion vector from encoded data; a refinement unit that performs refinement processing to correct the decoded motion vector; and a predictive signal generation unit that generates a predictive signal on the basis of the corrected motion vector outputted from the refinement unit. The predictive signal generation unit determines whether or not to apply BDOF processing for each block, on the basis of information calculated in the course of the refinement processing.

公开(公告)号：US11438625B2

公开(公告)日：2022-09-06

申请号：US16981744

申请日：2019-08-29

Applicant: KDDI CORPORATION

Inventor： Kyohei Unno ,  Kei Kawamura ,  Sei Naito

IPC: H04N19/57 ,  H04N19/105 ,  H04N19/176 ,  H04N19/182 ,  H04N19/513 ,  H04N19/52

Abstract: An image decoding device includes a prediction unit configured to generate a prediction signal included in a prediction block based on a motion vector. The prediction unit is configured to perform refinement processing of setting a search range based on a reference position specified by the motion vector, specifying a corrected reference position having the smallest predetermined cost from the search range, and correcting the motion vector based on the corrected reference position. When a block size of the prediction block is larger than a predetermined block size, the prediction unit is configured to divide the prediction block into sub-block groups and perform the refinement processing for each sub-block.

公开(公告)号：US11438615B2

公开(公告)日：2022-09-06

申请号：US16981771

申请日：2019-12-06

Applicant: KDDI CORPORATION

Inventor： Kei Kawamura ,  Sei Naito

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186

Abstract: A decoding device includes a transformer sets a decoded luminance component of a prediction target block to the same number of samples as that of the chrominance component corresponding to the decoded luminance component of the prediction target block and generates a luminance reference signal. A specificator specifies luminance pixels having minimum and maximum pixel values of the decoded luminance component adjacent to the decoded luminance component of the prediction target block, respectively, outputs luminance pixel values obtained from specified luminance pixels, and outputs chrominance pixel values from pigment pixels corresponding to the luminance pixels. A derivator derives a linear prediction parameter from the two pixel values and a linear prediction model. A chrominance linear predictor obtains a chrominance prediction signal by applying the linear prediction model based on the linear prediction parameter to the luminance reference signal. The chrominance prediction and residual signals are summed to generate a reconstructed chrominance signal.

公开(公告)号：US10027980B2

公开(公告)日：2018-07-17

申请号：US14990602

申请日：2016-01-07

Applicant: KDDI CORPORATION

Inventor： Kei Kawamura ,  Sei Naito

IPC: H04N19/593 ,  H04N19/119 ,  H04N9/804 ,  H04N19/132 ,  H04N19/186 ,  H04N19/59 ,  H04N19/176 ,  H04N19/159 ,  H04N19/196 ,  H04N19/182

CPC classification number: H04N19/593 ,  H04N9/8045 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/196 ,  H04N19/59

Abstract: In the case where an input image is an image of a non-YUV420 format and an encoding unit is the smallest CU block, an adaptive-sub-sampling luma reference pixel acquisition unit sub-samples reference pixels existing neighboring a luma block corresponding to a chroma prediction target block based on a luma intra prediction mode, and acquires a pixel value of each of the sub-sampled reference pixels. In the case where the input image is an image of a non-YUV420 format and the encoding unit is the smallest CU block, an adaptive-sub-sampling chroma reference pixel acquisition unit sub-samples reference pixels existing neighboring the chroma prediction target block based on the luma intra prediction mode, and acquires a pixel value of each of the sub-sampled reference pixels.