Patents by Inventor Sei Naito

Sei Naito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12277739
    Abstract: A point-cloud decoding device 200 according to the present invention includes: a geometry information decoding unit 2010 configured to decode a flag that controls whether to apply “Implicit QtBt” or not; and an attribute-information decoding unit 2060 configured to decode a flag that controls whether to apply “scalable lifting” or not; wherein, a restriction is set not to apply the “scalable lifting” when the “Implicit QtBt” is applied.
    Type: Grant
    Filed: September 30, 2022
    Date of Patent: April 15, 2025
    Assignee: KDDI CORPORATION
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito
  • Publication number: 20250080765
    Abstract: An image decoding device includes a motion vector decoding unit configured to decode a motion vector from coded data; and a refinement unit configured to search for the motion vector with a value of the motion vector decoded by the motion vector decoding unit as an initial value, and set the decoded motion vector as a final motion vector in a case where a searching cost at an initial searched point is larger than a predetermined threshold value or in a case where the searching cost at the initial searched point is equal to or larger than the threshold value.
    Type: Application
    Filed: November 19, 2024
    Publication date: March 6, 2025
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Publication number: 20250080766
    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.
    Type: Application
    Filed: November 20, 2024
    Publication date: March 6, 2025
    Applicant: KDDI CORPORATION
    Inventors: Kei KAWAMURA, Sei NAITO
  • Patent number: 12238282
    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.
    Type: Grant
    Filed: March 5, 2024
    Date of Patent: February 25, 2025
    Assignee: KDDI CORPORATION
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito
  • Publication number: 20250030885
    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.
    Type: Application
    Filed: October 7, 2024
    Publication date: January 23, 2025
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Publication number: 20250024026
    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.
    Type: Application
    Filed: October 1, 2024
    Publication date: January 16, 2025
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Patent number: 12192501
    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.
    Type: Grant
    Filed: November 29, 2023
    Date of Patent: January 7, 2025
    Assignee: KDDI CORPORATION
    Inventors: Kei Kawamura, Sei Naito
  • Publication number: 20250008161
    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.
    Type: Application
    Filed: September 11, 2024
    Publication date: January 2, 2025
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Patent number: 12143629
    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.
    Type: Grant
    Filed: December 15, 2023
    Date of Patent: November 12, 2024
    Assignee: KDDI Corporation
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito
  • Patent number: 12137210
    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.
    Type: Grant
    Filed: March 7, 2023
    Date of Patent: November 5, 2024
    Assignee: KDDI CORPORATION
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito
  • Patent number: 12120353
    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.
    Type: Grant
    Filed: February 17, 2022
    Date of Patent: October 15, 2024
    Assignee: KDDI CORPORATION
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito
  • Publication number: 20240292023
    Abstract: An image decoding device includes: a motion compensation predictor configured to generate a prediction image signal of a prediction target block based on information about a motion vector in a unit of the block and a reference frame; an overlapped block motion compensator carrying out an overlapped block motion compensation process of correcting the prediction image signal of the prediction target block by subjecting the prediction image signal of the prediction target block and a prediction image signal generated based on information about a motion vector and a reference frame of an adjacent block of the prediction target block to weighted averaging; and a determinator determining whether the overlapped block motion compensation process is applied to the prediction target block or not. The determinator determines application of the overlapped block motion compensation process to the prediction target block, when unidirectional prediction is applied to the adjacent block.
    Type: Application
    Filed: May 8, 2024
    Publication date: August 29, 2024
    Applicant: KDDI CORPORATION
    Inventors: Yoshitaka KIDANI, Kei KAWAMURA, Kyohei UNNO, Sei NAITO
  • Publication number: 20240283972
    Abstract: An image decoding device includes: a prediction signal generation unit configured to determine whether or not an application condition of Bi-Directional Optical Flow (BDOF) processing is satisfied for each block, generate a prediction signal by executing the BDOF processing in a case where it is determined that the application condition is satisfied, and set the application condition based on a weight coefficient in a case where calculation is performed using pixel values of two reference frames or values calculated from the pixel values in the BDOF processing such that the application condition includes a condition on time distances between the two reference frames and a target frame.
    Type: Application
    Filed: April 25, 2024
    Publication date: August 22, 2024
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Publication number: 20240223806
    Abstract: An image decoding device includes: a prediction signal generation unit that generates a prediction signal by intra prediction, wherein in a block to which intra sub-partitions are applied, the prediction signal generation unit refers to a pixel of a decoded block adjacent to the block when generating prediction signals of all sub-blocks in the block.
    Type: Application
    Filed: March 19, 2024
    Publication date: July 4, 2024
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Yoshitaka KIDANI, Kei KAWAMURA, Sei NAITO
  • Publication number: 20240214568
    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.
    Type: Application
    Filed: March 5, 2024
    Publication date: June 27, 2024
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Patent number: 12022113
    Abstract: An image decoding device includes: a motion compensation predictor configured to generate a prediction image signal of a prediction target block based on information about a motion vector in a unit of the block and a reference frame; an overlapped block motion compensator carrying out an overlapped block motion compensation process of correcting the prediction image signal of the prediction target block by subjecting the prediction image signal of the prediction target block and a prediction image signal generated based on information about a motion vector and a reference frame of an adjacent block of the prediction target block to weighted averaging; and a determinater determining whether the overlapped block motion compensation process is applied to the prediction target block or not. The determinater determines application of the overlapped block motion compensation process to the prediction target block, when unidirectional prediction is applied to the adjacent block.
    Type: Grant
    Filed: February 24, 2021
    Date of Patent: June 25, 2024
    Assignee: KDDI CORPORATION
    Inventors: Yoshitaka Kidani, Kei Kawamura, Kyohei Unno, Sei Naito
  • Patent number: 12010339
    Abstract: An image decoding device (200) includes: a prediction signal generation unit (241D) configured to determine whether or not an application condition of BDOF processing is satisfied for each block, generate a prediction signal by executing the BDOF processing in a case where it is determined that the application condition is satisfied, and set the application condition based on a weight coefficient in a case where calculation is performed using pixel values of two reference frames or values calculated from the pixel values in the BDOF processing such that the application condition includes a condition on time distances between the two reference frames and a target frame.
    Type: Grant
    Filed: February 17, 2022
    Date of Patent: June 11, 2024
    Assignee: KDDI CORPORATION
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito
  • Patent number: 11962801
    Abstract: An image decoding device includes: a prediction signal generation unit that generates a prediction signal by intra prediction, wherein in a block to which intra sub-partitions are applied, the prediction signal generation unit refers to a pixel of a decoded block adjacent to the block when generating prediction signals of all sub-blocks in the block.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: April 16, 2024
    Assignee: KDDI CORPORATION
    Inventors: Kyohei Unno, Yoshitaka Kidani, Kei Kawamura, Sei Naito
  • Publication number: 20240114165
    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.
    Type: Application
    Filed: December 15, 2023
    Publication date: April 4, 2024
    Applicant: KDDI CORPORATION
    Inventors: Kyohei UNNO, Kei KAWAMURA, Sei NAITO
  • Patent number: 11949860
    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.
    Type: Grant
    Filed: June 30, 2022
    Date of Patent: April 2, 2024
    Assignee: KDDI Corporation
    Inventors: Kyohei Unno, Kei Kawamura, Sei Naito