Patents Assigned to Nippon Hoso Kyokai
  • Publication number: 20230018619
    Abstract: 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.
    Type: Application
    Filed: September 27, 2022
    Publication date: January 19, 2023
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Atsuro ICHIGAYA, Shimpei NEMOTO
  • Patent number: 11546585
    Abstract: 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.
    Type: Grant
    Filed: February 18, 2021
    Date of Patent: January 3, 2023
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Shunsuke Iwamura, Shimpei Nemoto, Atsuro Ichigaya
  • Publication number: 20220408112
    Abstract: 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
    Type: Application
    Filed: August 23, 2022
    Publication date: December 22, 2022
    Applicant: Nippon Hoso Kyokai
    Inventors: Atsuro Ichigaya, Shunsuke Iwamura, Shimpei Nemoto, Kazuhisa Iguchi
  • Publication number: 20220385894
    Abstract: 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.
    Type: Application
    Filed: August 4, 2022
    Publication date: December 1, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Atsuro ICHIGAYA, Shimpei NEMOTO
  • Patent number: 11496735
    Abstract: 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.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: November 8, 2022
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Shunsuke Iwamura, Atsuro Ichigaya, Shimpei Nemoto
  • Patent number: 11496739
    Abstract: An encoding device encodes each encoding-target block.
    Type: Grant
    Filed: March 22, 2022
    Date of Patent: November 8, 2022
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Shunsuke Iwamura, Shimpei Nemoto, Atsuro Ichigaya
  • Publication number: 20220329863
    Abstract: An encoding device performing an encoding process in units of blocks into which images constituted by luminance signals and chrominance signals are divided includes: a predictor configured to predict a target chrominance block which is an encoding target block of the chrominance signals and generate a prediction chrominance block; a residual generator configured to generate a chrominance prediction residual indicating a difference between the target chrominance block and the prediction chrominance block; and a transformer configured to apply a transform process to the chrominance prediction residual and generate transform coefficients, wherein the transformer is configured to control, according to a signal format of the images, a transform type to be applied to the transform process.
    Type: Application
    Filed: June 24, 2022
    Publication date: October 13, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Shimpei NEMOTO, Atsuro ICHIGAYA
  • Publication number: 20220321877
    Abstract: An image encoding device (1) includes a motion compensation predictor (109) configured to generate a prediction image corresponding to a target image by performing motion compensation prediction using a plurality of reference images, and an evaluator (111) configured to evaluate prediction accuracy of the prediction image for each image portion including one or more pixels by calculating a degree of similarity between the plurality of reference images for each image portion.
    Type: Application
    Filed: June 15, 2022
    Publication date: October 6, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Atsuro ICHIGAYA, Shunsuke IWAMURA, Shimpei NEMOTO, Kazuhisa IGUCHI
  • Patent number: 11457241
    Abstract: 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
    Type: Grant
    Filed: April 22, 2021
    Date of Patent: September 27, 2022
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Atsuro Ichigaya, Shunsuke Iwamura, Shimpei Nemoto, Kazuhisa Iguchi
  • Publication number: 20220303543
    Abstract: 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.
    Type: Application
    Filed: June 8, 2022
    Publication date: September 22, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shimpei NEMOTO, Shunsuke IWAMURA, Atsuro ICHIGAYA
  • Publication number: 20220303576
    Abstract: 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).
    Type: Application
    Filed: June 10, 2022
    Publication date: September 22, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Atsuro ICHIGAYA, Shimpei NEMOTO
  • Publication number: 20220279170
    Abstract: An intra prediction device predicts, by intra prediction, a luminance block and a chrominance block obtained by dividing an image. The intra prediction device includes a cross-component linear model predictor configured to predict the chrominance block from a decoded luminance block at a position corresponding to a position of the chrominance block using a linear model calculated from respective luminance and chrominance reference pixels around the chrominance block. The cross-component linear model predictor includes a reference pixel position selector configured to select linear model calculation pixel positions that are positions of the reference pixels to be used to calculate the linear model based on a luminance intra prediction mode that is an intra prediction mode applied to the intra prediction of the decoded luminance block.
    Type: Application
    Filed: May 20, 2022
    Publication date: September 1, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Atsuro ICHIGAYA, Shimpei NEMOTO
  • Patent number: 11431970
    Abstract: 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.
    Type: Grant
    Filed: December 23, 2021
    Date of Patent: August 30, 2022
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Shunsuke Iwamura, Atsuro Ichigaya, Shimpei Nemoto
  • Patent number: 11404041
    Abstract: A message management unit receives and accumulates a message, wherein the message is distributed for every update, is the message data representing a latest situation of a competition, an explanation generation unit generates an explanatory text for conveying unconveyed information detected from the message, based on conveyed information, a speech synthesis unit outputs a speech converted from the explanatory text, wherein the explanation generation unit stores the unconveyed information for the explanatory text as the conveyed information, stands by until completion of completion of the speech, and initiates a procedure for generating a new explanatory text based on updated unconveyed information.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: August 2, 2022
    Assignees: NIPPON HOSO KYOKAI, NHK Engineering System, Inc.
    Inventors: Tadashi Kumano, Ichiro Yamada, Atsushi Imai, Hideki Sumiyoshi, Yuko Yamanouchi, Toshihiro Shimizu, Nobumasa Seiyama, Shoei Sato, Reiko Saito, Taro Miyazaki, Kiyoshi Kurihara, Manon Ichiki, Tohru Takagi
  • Patent number: 11394958
    Abstract: An image encoding device (1) includes a motion compensation predictor (109) configured to generate a prediction image corresponding to a target image by performing motion compensation prediction using a plurality of reference images, and an evaluator (111) configured to evaluate prediction accuracy of the prediction image for each image portion including one or more pixels by calculating a degree of similarity between the plurality of reference images for each image portion.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: July 19, 2022
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Atsuro Ichigaya, Shunsuke Iwamura, Shimpei Nemoto, Kazuhisa Iguchi
  • Publication number: 20220224936
    Abstract: 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.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Atsuro Ichigaya, Shimpei Nemoto
  • Patent number: 11388414
    Abstract: 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.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: July 12, 2022
    Assignee: NIPPON HOSO KYOKAI
    Inventors: Shimpei Nemoto, Shunsuke Iwamura, Atsuro Ichigaya
  • Publication number: 20220217367
    Abstract: 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.
    Type: Application
    Filed: March 22, 2022
    Publication date: July 7, 2022
    Applicant: Nippon Hoso Kyokai
    Inventors: Shunsuke IWAMURA, Shimpei Nemoto, Atsuro Ichigaya
  • Publication number: 20220217348
    Abstract: An encoding device encodes each encoding-target block.
    Type: Application
    Filed: March 22, 2022
    Publication date: July 7, 2022
    Applicant: NIPPON HOSO KYOKAI
    Inventors: Shunsuke IWAMURA, Shimpei NEMOTO, Atsuro ICHIGAYA
  • Publication number: 20220217339
    Abstract: A deblocking filter device according to a first feature includes: a deblocking filter configured to perform a filter process on a boundary between a first reconstructed block and a second reconstructed block adjacent to the first reconstructed block; and a filter controller configured to control boundary filtering strength of the deblocking filter based on whether or not at least one of the first reconstructed block and the second reconstructed block is encoded using JCCR (Joint coding of chroma residual) in which one joint prediction residual is generated from prediction residuals of a Cb chrominance component and a Cr chrominance component.
    Type: Application
    Filed: March 22, 2022
    Publication date: July 7, 2022
    Applicant: Nippon Hoso Kyokai
    Inventors: Shunsuke Iwamura, Shimpei Nemoto, Yuichi Kondo, Kazuhisa Iguchi, Atsuro Ichigaya