公开(公告)号：US12132929B2

公开(公告)日：2024-10-29

申请号：US18530018

申请日：2023-12-05

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Atsuro Ichigaya ,  Shimpei Nemoto

IPC分类号： H04N19/513 ,  H04N19/105 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176

CPC分类号： H04N19/521 ,  H04N19/105 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176

摘要： A prediction image correcting device comprises a predictor (108) configured to predict a target image block obtained by dividing a present image frame by using a plurality of reference images to generate a prediction image corresponding to the target image block a prediction accuracy evaluator (109) configured to evaluate prediction accuracy of the prediction image based on a degree of similarity between the plurality of reference images used for generating the prediction image and a corrector (110) configured to perform correction processing on the prediction image by using a decoded neighboring block adjacent to the target image block, wherein the corrector is configured to control the correction processing based at least on an evaluation result of the prediction accuracy evaluator.

公开(公告)号：US11936885B2

公开(公告)日：2024-03-19

申请号：US18310191

申请日：2023-05-01

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Shimpei Nemoto ,  Atsuro Ichigaya

IPC分类号： H04N11/02 ,  H04N19/119 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/30 ,  H04N19/46 ,  H04N19/60 ,  H04N19/91

CPC分类号： H04N19/186 ,  H04N19/119 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/30 ,  H04N19/46 ,  H04N19/60 ,  H04N19/91

摘要： A method includes: decoding a bitstream and thereby outputting a transform coefficients for each color component of the block, a first flag indicating for each color component whether the block includes a non-zero transform coefficient, and a second flag indicating whether the block has been encoded using a color space transform that transforming a color space of a prediction residual from a color space of the original image to another color space; performing a color space inverse transform for the prediction residual restored from the transform coefficients, when the second flag indicates that the block has been encoded using the color space transform; and determining whether to perform chroma residual scaling for the prediction residual of the chrominance component, based on the first flag of a chrominance component and the second flag, the chroma residual scaling that performs scaling based on a luminance component corresponding to the chrominance component.

公开(公告)号：US11812015B2

公开(公告)日：2023-11-07

申请号：US17205267

申请日：2021-03-18

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Atsuro Ichigaya ,  Shimpei Nemoto

IPC分类号： H04N19/119 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

CPC分类号： H04N19/119 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

摘要： An image encoding device that divides an image into blocks and encodes on each of the blocks, the image encoding device includes: a sub-area divider configured to divide a target block to be encoded into a plurality of sub-areas; a reference direction determiner configured to determine a reference direction that indicates in which direction an encoded block to be referenced is located among encoded blocks around the target block; a motion vector deriver configured to derive a motion vector for each of the sub-areas by referencing a motion vector applied in inter prediction of an encoded block located in the determined reference direction; and a prediction image generator configured to generate a prediction image on the target block by performing inter prediction on each of the sub-areas by using the derived motion vector. The image encoding device configured to encode reference direction information that indicates the determined reference direction, and output a stream.

公开(公告)号：US11647224B2

公开(公告)日：2023-05-09

申请号：US17649474

申请日：2022-01-31

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Atsuro Ichigaya ,  Shimpei Nemoto

IPC分类号： H04N19/137 ,  H04N19/573 ,  H04N19/129 ,  H04N19/157 ,  H04N19/176

CPC分类号： H04N19/573 ,  H04N19/129 ,  H04N19/137 ,  H04N19/157 ,  H04N19/176

摘要： An image encoding device encodes a block-based target image. The image encoding device comprises, in a transform skip mode in which orthogonal transform processing of the target image is skipped, a motion compensation predictor configured to generate a prediction image corresponding to the target image by performing motion compensation prediction using a plurality of reference images, an evaluator configured to evaluate a degree of similarity between the plurality of reference images on a pixel-by-pixel basis, a subtractor configured to calculate prediction residuals each indicating a difference between the target image and the prediction image on a pixel-by-pixel basis, a rearranger configured to rearrange the prediction residuals based on a result of evaluation by the evaluator and an encoder configured to encode the prediction residuals rearranged by the rearranger.

公开(公告)号：US11546585B2

公开(公告)日：2023-01-03

申请号：US17178961

申请日：2021-02-18

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Shimpei Nemoto ,  Atsuro Ichigaya

IPC分类号： H04N19/11 ,  H04N19/176 ,  H04N19/119 ,  H04N19/159

摘要： An encoding device (1) according to the present invention includes: an encoding processing order determiner (11) configured to determine encoding processing order of blocks to be encoded; an intra-prediction mode candidate generator (12) configured to generate intra-prediction mode candidates of the blocks to be encoded, based on the encoding processing order; an intra-prediction mode determiner (13) configured to determine intra-prediction modes to be applied to the blocks to be encoded from the intra-prediction mode candidates; an intra predictor (14) configured to perform intra-prediction processing on the blocks to be encoded, based on the determined encoding processing order and the intra-prediction modes; and an entropy encoder (15) configured to perform entropy encoding processing on the encoding processing order and the intra-prediction modes.

公开(公告)号：US11496735B2

公开(公告)日：2022-11-08

申请号：US17035997

申请日：2020-09-29

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Atsuro Ichigaya ,  Shimpei Nemoto

IPC分类号： H04N19/119 ,  H04N19/122 ,  H04N19/124 ,  H04N19/167 ,  H04N19/176 ,  H04N19/61 ,  H04N19/91

摘要： An image encoding device (1) encodes a block-based target image. The image encoding device (1) comprises: a predictor (109) configured to generate a prediction image corresponding to the target image by performing prediction using a plurality of reference images; an evaluator (111) configured to evaluate a degree of similarity between the plurality of reference images on a pixel-by-pixel basis; a calculator (101) configured to calculate a prediction residual indicating a pixel-based difference between the target image and the prediction image; a determiner (112) configured to determine a partial area, to which an orthogonal transform and quantization are to be applied, of the prediction residual based on a result of the evaluation by the evaluator; and a transformer/quantizer (102) configured to perform an orthogonal transform and quantization only for the partial area in the prediction residual.

公开(公告)号：US11431970B2

公开(公告)日：2022-08-30

申请号：US17645916

申请日：2021-12-23

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Atsuro Ichigaya ,  Shimpei Nemoto

IPC分类号： H04N19/176 ,  H04N19/186 ,  H04N19/11 ,  H04N19/159

摘要： An intra prediction device performing intra prediction on a luminance block and a chrominance block includes: a chrominance candidate specifier configured to specify a mode number of an intra prediction mode applied to the luminance block corresponding to the chrominance block as one of candidates for an intra prediction mode to be applied to the chrominance block; and a chrominance prediction mode converter configured to convert the mode number before conversion specified by the chrominance candidate specifier using a conversion table and output a mode number after conversion. In the conversion table, for directional prediction, a given number of mode numbers in ascending order of the mode number among the mode numbers before conversion are associated with a given number of mode numbers in descending order of the mode number among the mode numbers after conversion.

公开(公告)号：US11388414B2

公开(公告)日：2022-07-12

申请号：US17036931

申请日：2020-09-29

申请人： NIPPON HOSO KYOKAI

发明人： Shimpei Nemoto ,  Shunsuke Iwamura ,  Atsuro Ichigaya

IPC分类号： H04N19/146 ,  H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/13 ,  H04N19/46 ,  H04N19/593

摘要： An image encoding device (1) according to a first feature encodes blocks obtained by dividing an original image of a frame included in a video. The image encoding device (1) includes a code amount allocator (180) configured to allocate a code amount to each of a plurality of intra prediction modes defined in advance, a mode selector (171) configured to select an intra prediction mode to be applied to a target block of intra prediction from among the plurality of intra prediction modes, and an encoder (130) configured to encode identification information indicating the selected intra prediction mode in accordance with the allocated code amount. The code amount allocator (180) calculates a feature amount of a plurality of reference pixels adjacent to the target block and changes a manner of allocation of code amounts to the plurality of intra prediction modes based on the calculated feature amount.

公开(公告)号：US20220132127A1

公开(公告)日：2022-04-28

申请号：US17646832

申请日：2022-01-03

申请人： Nippon Hoso Kyokai

发明人： Atsuro ICHIGAYA ,  Shunsuke Iwamura ,  Yasuko Morita ,  Shinichi Sakaida

IPC分类号： H04N19/126 ,  H04N19/176 ,  H04N19/157 ,  H04N19/107 ,  H04N19/117 ,  H04N19/139 ,  H04N19/159 ,  H04N19/18 ,  H04N19/44 ,  H04N19/52 ,  H04N19/593 ,  H04N19/91

摘要： An image coding device is provided with a determination unit which determines whether to apply an orthogonal transform to a transform block obtained by dividing a prediction difference signal indicating a difference between an input image and a predicted image or perform a transform skip by which the orthogonal transform is not applied, and an orthogonal transform unit which performs processing selected on the basis of the determination, the image coding device comprising a quantization unit which, when the transform skip is selected on the basis of the determination, quantizes the transform block using a first quantization matrix in which the quantization roughnesses of all elements previously shared with a decoding side are equal, and when the orthogonal transform is applied to the transform block on the basis of the determination, quantizes the transform block using the first quantization matrix or a second quantization matrix that is transmitted to the decoding side.

公开(公告)号：US12015789B2

公开(公告)日：2024-06-18

申请号：US17681296

申请日：2022-02-25

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke Iwamura ,  Atsuro Ichigaya ,  Shimpei Nemoto

IPC分类号： H04N19/176 ,  H04N19/117 ,  H04N19/119 ,  H04N19/124 ,  H04N19/50 ,  H04N19/513 ,  H04N19/61 ,  H04N19/86 ,  H04N19/91

CPC分类号： H04N19/176 ,  H04N19/117 ,  H04N19/119 ,  H04N19/124 ,  H04N19/513 ,  H04N19/61 ,  H04N19/86 ,  H04N19/91

摘要： An encoding device 1 includes: a merge predictor 181a configured to generate area prediction images using motion vectors of a plurality of divided areas obtained by dividing an encoding-target block and merge areas at boundaries of a plurality of the generated area prediction images through weighted averaging to generate a prediction block of the encoding-target block: and a filter controller 161 configured to control the deblocking filter based on a position of a merged area merged by the merge predictor 181a through the weighted averaging.