公开(公告)号：US20230239475A1

公开(公告)日：2023-07-27

申请号：US18193436

申请日：2023-03-30

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

CPC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 ,  H04N19/12

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：US20230018619A1

公开(公告)日：2023-01-19

申请号：US17935857

申请日：2022-09-27

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：US20220303576A1

公开(公告)日：2022-09-22

申请号：US17837727

申请日：2022-06-10

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke IWAMURA ,  Atsuro ICHIGAYA ,  Shimpei NEMOTO

IPC分类号： H04N19/593 ,  H04N19/105 ,  H04N19/11 ,  H04N19/12 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61

摘要： An image encoding device (1) includes the cross-component intra predictor (171a) generates a predicted chroma block through cross-component intra prediction in which a chroma block to be encoded is predicted by referring to, as the neighbouring decoded pixels adjacent to the chroma block, decoded luminance pixels and decoded chroma pixels, a candidate generator (181) configured to generate candidates for an orthogonal transform type to be applied to orthogonal transform processing on prediction residuals that represent errors between the predicted chroma block and the chroma block; and a transformer (121) configured to perform the orthogonal transform processing on the chroma prediction residuals by using an orthogonal transform type selected from among the candidates generated by the candidate generator (181). The candidate generator (181) generates the candidates for the orthogonal transform type, depending on whether or not positions of the neighbouring decoded pixels referred to in cross-component intra prediction are to only any one of a top, a bottom, a left, and a right of a chroma block.

公开(公告)号：US20220217338A1

公开(公告)日：2022-07-07

申请号：US17655745

申请日：2022-03-21

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke IWAMURA ,  Shimpei NEMOTO ,  Atsuro ICHIGAYA

IPC分类号： H04N19/117 ,  H04N19/82 ,  H04N19/146 ,  H04N19/184

摘要： A deblocking filter control device that controls a deblocking filter process performed on a decoded image includes: a parameter deriver configured to derive a parameter value that controls a filter strength in the deblocking filter process; and a parameter transformer configured to output a transformed parameter value by transforming the parameter value based on an input bit depth that is a bit depth of the video signal, wherein when the input bit depth is smaller than a predetermined bit depth, the parameter transformer is configured to output the transformed parameter value by adding an offset value to the parameter value and making a bit shift of a result of the addition, and the parameter transformer is configured to change the offset value based on the input bit depth.

公开(公告)号：US20220210417A1

公开(公告)日：2022-06-30

申请号：US17655597

申请日：2022-03-21

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke IWAMURA ,  Shimpei NEMOTO ,  Atsuro ICHIGAYA

IPC分类号： H04N19/124 ,  H04N19/30 ,  H04N19/82 ,  H04N19/186

摘要： An encoding device includes: a quantizer configured to perform a quantization process; a loop filter configured to perform an adaptive loop filter process; and an entropy encoder configured to output a bit stream including an adaptive parameter set. The adaptive parameter set includes encoding tool type information indicating which parameter of parameter candidates including one of a scaling list parameter including a parameter of a scaling list that controls the quantization process and an adaptive loop filter parameter including a parameter of a filter coefficient used in the adaptive loop filter process is included in the adaptive parameter set, and a chrominance parameter present flag indicating whether or not a parameter for a chrominance signal is present in the adaptive parameter set, and the chrominance parameter present flag is applied in common to the scaling list parameter and the adaptive loop filter parameter.

公开(公告)号：US20220182621A1

公开(公告)日：2022-06-09

申请号：US17680945

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： H04N19/117 ,  H04N19/82 ,  H04N19/176 ,  H04N19/46

摘要： An encoding device that performs encoding on each of blocks obtained by dividing an image includes: a weighted bi-predictor 181a configured to generate a prediction block of an encoding-target block by weighted-averaging a plurality of reference images using weighted coefficients selected from a weighted coefficient set including a plurality of weighted coefficients; and a filter controller 161 configured to control deblocking filter based on the weighted coefficients applied by the weighted bi-predictor 181a to each of the two blocks adjacent blocks.

公开(公告)号：US20220159293A1

公开(公告)日：2022-05-19

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： H04N19/573 ,  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：US20220030250A1

公开(公告)日：2022-01-27

申请号：US17494010

申请日：2021-10-05

申请人： NIPPON HOSO KYOKAI

发明人： Shunsuke IWAMURA ,  Atsuro ICHIGAYA

IPC分类号： H04N19/159 ,  H04N19/105 ,  H04N19/12 ,  H04N19/129 ,  H04N19/61 ,  H04N19/176 ,  H04N19/44 ,  H04N19/593 ,  H04N19/13

摘要： It is possible to reduce an increase in entropy even if a reference pixel of a lower side or a right side is used in intra prediction. An encoding device 1 according to the present invention includes: an intra predictor 14a configured to generate a predicted image by using an intra prediction mode; a residual signal generator 14b configured to generate a residual signal from a difference between the predicted image and an original image; and an orthogonal transformer 14c configured to, when the intra predictor 14a generates the predicted image by using a reference pixel positioned on at least one of a right side and a lower side, perform orthogonal transformation processing on the residual signal after inverting a basis of at least one of a horizontal direction and a vertical direction.

公开(公告)号：US20180176557A1

公开(公告)日：2018-06-21

申请号：US15899108

申请日：2018-02-19

申请人： NIPPON HOSO KYOKAI

发明人： Atsuro ICHIGAYA ,  Shinichi SAKAIDA

IPC分类号： H04N19/105 ,  H04N19/61 ,  H04N19/117 ,  H04N19/176

CPC分类号： H04N19/105 ,  H04N19/117 ,  H04N19/12 ,  H04N19/147 ,  H04N19/176 ,  H04N19/46 ,  H04N19/593 ,  H04N19/619 ,  H04N19/625

摘要： An image encoding device 1 of the present disclosure includes a neighboring pixel non-reference predictor 11 configured to generate a predicted image by a predetermined neighboring pixel non-reference prediction for each pixel signal of an original image in a block unit, a filter processor 12 configured to perform a low-pass filter process on a prediction signal located at a boundary of a block of the predicted image by using a decoded neighboring signal neighboring to the predicted image under a predetermined control, a prediction residual signal generator 55 configured to generate a prediction residual signal of the block unit by using the predicted image, an orthogonal transformer 14 configured to perform an orthogonal transformation process on the prediction residual signal of the block unit under the predetermined control, and an orthogonal transformation selection controller 25 configured to control the filter processor 12 and the orthogonal transformer 14 and generate a predetermined transformation type identification signal. An image decoding device 5 of the present disclosure performs a decoding process based on a transformation type identification signal at the time of the predetermined neighboring pixel non-reference prediction.

公开(公告)号：US20160212429A1

公开(公告)日：2016-07-21

申请号：US15084073

申请日：2016-03-29

申请人： NIPPON HOSO KYOKAI

发明人： Atsuro ICHIGAYA ,  Shunsuke IWAMURA ,  Yasuko MORITA ,  Shinichi SAKAIDA

IPC分类号： H04N19/126 ,  H04N19/61 ,  H04N19/593 ,  H04N19/117 ,  H04N19/70 ,  H04N19/18 ,  H04N19/139 ,  H04N19/52 ,  H04N19/107 ,  H04N19/159 ,  H04N19/176 ,  H04N19/44 ,  H04N19/91

CPC分类号： H04N19/126 ,  H04N19/107 ,  H04N19/117 ,  H04N19/12 ,  H04N19/139 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/44 ,  H04N19/52 ,  H04N19/593 ,  H04N19/61 ,  H04N19/70 ,  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.

摘要翻译： 图像编码装置具有确定单元，其确定是否将正交变换应用于通过划分表示输入图像与预测图像之间的差的预测差异信号而获得的变换块，或执行变换跳过，通过该变换跳过正交变换 以及正交变换单元，其执行基于所述确定而选择的处理，所述图像编码装置包括量化单元，所述量化单元在基于所述确定来选择所述变换跳过时，使用第一 量化矩阵，其中先前与解码侧共享的所有元素的量化粗糙度相等，并且当基于该确定将正交变换应用于变换块时，使用第一量化矩阵或第二量化来量化变换块 矩阵被发送到解码侧。