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21.发明授权公开(公告)号：US11877003B2
公开(公告)日：2024-01-16
申请号：US17657280
申请日：2022-03-30
申请人： NIPPON HOSO KYOKAI
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.
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公开(公告)号：US11736728B2
公开(公告)日：2023-08-22
申请号：US17821739
申请日：2022-08-23
申请人： NIPPON HOSO KYOKAI
IPC分类号： H04N19/60 , H04N19/117 , H04N19/124 , H04N19/172 , H04N19/91
CPC分类号： H04N19/60 , H04N19/117 , H04N19/124 , H04N19/172 , H04N19/91
摘要： An encoding device 1 includes: a transformer 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantizer 14 configured to generate quantization coefficient by quantizing the orthogonal transform coefficient based on a quantization parameter; an entropy encoder 24 configured to generate encoded data by encoding the quantization coefficient; an image decoder 10 configured to restore an orthogonal transform coefficient from the quantization coefficient based on the quantization parameter and generate a pre-filtering image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filter 18 configured to perform a filtering process on the pre-filtering image and control a filtering strength depending on a result of comparison between a luminance signal level of the pre-filtering image and a luminance threshold value.
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23.发明公开公开(公告)号：US20230199215A1
公开(公告)日：2023-06-22
申请号：US18172974
申请日：2023-02-22
申请人： NIPPON HOSO KYOKAI
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.
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公开(公告)号：US11457241B2
公开(公告)日：2022-09-27
申请号：US17237780
申请日：2021-04-22
申请人： NIPPON HOSO KYOKAI
IPC分类号： H04N19/60 , H04N19/117 , H04N19/124 , H04N19/172 , H04N19/91
摘要： An encoding device 1 includes: a transformer 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantizer 14 configured to generate quantization coefficient by quantizing the orthogonal transform coefficient based on a quantization parameter; an entropy encoder 24 configured to generate encoded data by encoding the quantization coefficient; an image decoder 10 configured to restore an orthogonal transform coefficient from the quantization coefficient based on the quantization parameter and generate a pre-filtering image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filter 18 configured to perform a filtering process on the pre-filtering image and control a filtering strength depending on a result of comparison between a luminance signal level of the pre-filtering image and a luminance threshold value.
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公开(公告)号：US20220124324A1
公开(公告)日：2022-04-21
申请号：US17645916
申请日：2021-12-23
申请人： NIPPON HOSO KYOKAI
IPC分类号： H04N19/11 , H04N19/176 , H04N19/186 , 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.
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公开(公告)号：US11223827B2
公开(公告)日：2022-01-11
申请号：US15084073
申请日：2016-03-29
申请人： NIPPON HOSO KYOKAI
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 , H04N19/12 , H04N19/61 , H04N19/70
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.
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公开(公告)号：US11212525B2
公开(公告)日：2021-12-28
申请号：US16424148
申请日：2019-05-28
申请人： NIPPON HOSO KYOKAI
发明人： Atsuro Ichigaya , Shunsuke Iwamura
IPC分类号： H04N19/117 , H04N19/124 , H04N19/13 , H04N19/176 , H04N19/186 , H04N19/61 , H04N1/41 , H04N19/82 , H04N19/86 , H04N19/157 , H04N19/136
摘要： An encoding device 1 includes: a transformation unit 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantization unit 14 configured to generate a quantization coefficient by quantizing the orthogonal transform coefficient on the basis of a quantization parameter; an entropy encoding unit 24 configured to generate encoded data by encoding the quantization coefficient; an image decoding unit 10 configured to restore an orthogonal transform coefficient from the quantization coefficient on the basis of the quantization parameter and generate a reconstructed image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filtering unit 18 configured to perform a filtering process on the reconstructed image, wherein the deblocking filtering unit 18 controls a filtering strength depending on a luminance signal level of the reconstructed image and the quantization parameter.
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公开(公告)号：US10681346B2
公开(公告)日：2020-06-09
申请号：US15899130
申请日：2018-02-19
申请人： NIPPON HOSO KYOKAI
IPC分类号： H04B1/66 , H04N19/105 , H04N19/176 , H04N19/147 , H04N19/625 , H04N19/12 , H04N19/593 , H04N19/46 , H04N19/117 , H04N19/61
摘要： An image encoding device is disclosed that performs an operation of generating a predicted image of a target block. The prediction operation is a type of operation that does not use neighboring pixels. The image encoding device further performs operations of performing a low-pass filter process on a prediction signal located at a boundary of the predicted image of the target block, using a decoded neighboring signal, generating a prediction residual signal of target block using the predicted image of the target block, and dividing the prediction residual signal of the target block unit block shapes designated in advance.
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公开(公告)号：US20190281295A1
公开(公告)日：2019-09-12
申请号：US16424148
申请日：2019-05-28
申请人： NIPPON HOSO KYOKAI
发明人： Atsuro Ichigaya , Shunsuke Iwamura
IPC分类号： H04N19/117 , H04N19/124 , H04N19/61 , H04N19/13 , H04N19/186 , H04N19/176
摘要： An encoding device 1 includes: a transformation unit 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantization unit 14 configured to generate a quantization coefficient by quantizing the orthogonal transform coefficient on the basis of a quantization parameter; an entropy encoding unit 24 configured to generate encoded data by encoding the quantization coefficient; an image decoding unit 10 configured to restore an orthogonal transform coefficient from the quantization coefficient on the basis of the quantization parameter and generate a reconstructed image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filtering unit 18 configured to perform a filtering process on the reconstructed image, wherein the deblocking filtering unit 18 controls a filtering strength depending on a luminance signal level of the reconstructed image and the quantization parameter.
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公开(公告)号：US12120350B2
公开(公告)日：2024-10-15
申请号：US18344306
申请日：2023-06-29
申请人： NIPPON HOSO KYOKAI
IPC分类号： H04N19/60 , H04N19/117 , H04N19/124 , H04N19/172 , H04N19/91
CPC分类号： H04N19/60 , H04N19/117 , H04N19/124 , H04N19/172 , H04N19/91
摘要： An encoding device 1 includes: a transformer 13 configured to calculate an orthogonal transform coefficient by performing an orthogonal transformation process on a residual image indicating a difference between the input image and a predicted image of the input image; a quantizer 14 configured to generate quantization coefficient by quantizing the orthogonal transform coefficient based on a quantization parameter; an entropy encoder 24 configured to generate encoded data by encoding the quantization coefficient; an image decoder 10 configured to restore an orthogonal transform coefficient from the quantization coefficient based on the quantization parameter and generate a pre-filtering image by adding the predicted image to a residual image restored by performing inverse orthogonal transformation on the orthogonal transform coefficient; and a deblocking filter 18 configured to perform a filtering process on the pre-filtering image and control a filtering strength depending on a result of comparison between a luminance signal level of the pre-filtering image and a luminance threshold value.
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