Patents by Inventor Takeshi Tsukuba

Takeshi Tsukuba 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: 10225567
    Abstract: The amount of encoding of hierarchically encoded data is reduced with an improvement in the accuracy of a predicted image by including information for accurate derivation of a position of a reference layer pixel corresponding to a pixel in a higher layer, which is a target layer, in the hierarchically encoded data. A hierarchical moving image decoder includes a parameter set decoding unit decoding inter-layer phase correspondence information and a predicted image generator generating a predicted image on the basis of the inter-layer phase correspondence information.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: March 5, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Takeshi Tsukuba
  • Publication number: 20190068985
    Abstract: Even in a case in which a color format is a format other than 4:2:0, an image coding device and an image decoding device capable of accurately locating a reference pixel position in inter-layer image prediction are realized. A hierarchical moving image decoding device (1) includes a parameter set decoding section (12) that decodes a scaled reference layer offset syntax that is coded in a chroma pixel unit and a predicted image generation section (1442) that derives a scale based on a scaled reference layer offset which is a product of the scaled reference layer offset syntax and a luminance chroma size ratio of a target layer picture and generates a predicted image.
    Type: Application
    Filed: October 30, 2018
    Publication date: February 28, 2019
    Inventors: Tomoyuki YAMAMOTO, Tomohiro IKAI, Takeshi TSUKUBA
  • Publication number: 20190068967
    Abstract: A predicted-image 145 correction unit derives a predicted pixel value constituting a predicted image by applying, to an unfiltered predicted pixel value in a target pixel within a prediction block, and also to at least one unfiltered reference pixel value, a boundary filter that applies a weighted addition used for a filter mode corresponding to a non-directional prediction mode.
    Type: Application
    Filed: January 11, 2017
    Publication date: February 28, 2019
    Inventors: TOMOHIRO IKAI, TAKESHI TSUKUBA
  • Publication number: 20190052905
    Abstract: The amount of processing is reduced with high coding efficiency maintained. There is provided an arithmetic decoding device including syntax decoding means for decoding each of at least a first syntax element and a second syntax element indicating a transform coefficient using arithmetic decoding with a context or arithmetic decoding without a context. The syntax decoding means performs decoding that at least includes not decoding the first syntax element and decoding the second syntax element using the arithmetic decoding without a context, and decoding the first syntax element using the arithmetic decoding with a context and decoding the second syntax element using the arithmetic decoding without a context.
    Type: Application
    Filed: October 16, 2018
    Publication date: February 14, 2019
    Inventors: Tomohiro IKAI, Yukinobu YASUGI, Tomoyuki YAMAMOTO, Takeshi TSUKUBA
  • Patent number: 10200717
    Abstract: In DBBP, there is a problem because of a large processing amount of a synthesis process in which two complement images are synthesized according to segmentation and a filtering process is executed. A predicted image generation device includes a segmentation derivation section that derives segmentation information from an image; and an image synthesis section that generates a predicted image. The image synthesis section executes a filtering process based on a partition mode and the segmentation information.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: February 5, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomohiro Ikai, Takeshi Tsukuba
  • Publication number: 20190037242
    Abstract: Since the size of a lookup table necessary to retain a partition pattern list is large in DMM 1 prediction, it is difficult to dispose the lookup table in a cache. For this reason, access to an external memory occurs at each time of access to the lookup table, and thus a problem may occur in that a processing speed is lowered. In the DMM 1 prediction, the lookup table for retaining a partition pattern of a first size is deleted, a partition pattern of a second size smaller than the first size is scaled to the first size, and the partition pattern of the first size is generated.
    Type: Application
    Filed: September 18, 2018
    Publication date: January 31, 2019
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi TSUKUBA, Tomohiro IKAI
  • Patent number: 10194161
    Abstract: A reference picture information decoding unit (13) omits decoding of a reference list sorting presence or absence flag and/or a reference list sorting order based on the number of current picture referable pictures.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: January 29, 2019
    Assignee: Dolby International AB
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Yukinobu Yasugi, Takeshi Tsukuba
  • Patent number: 10187659
    Abstract: A hierarchy video decoding device (1) includes a parameter set decoding unit (12) that decodes reference region information, and a predicted image generation portion (1442) that derives a scale or a corresponding reference position, and generates a predicted image, based on a target layer reference region position and a reference layer reference region position which are derived from the reference region information.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: January 22, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Takeshi Tsukuba
  • Publication number: 20190014351
    Abstract: A hierarchical moving image decoding device (1) includes a profile information decoding unit (1221a) that decodes/configures sublayer profile information after decoding a sublayer profile present flag regarding respective sublayers, and a level information decoding unit (1221b) that decodes/configures sublayer level information.
    Type: Application
    Filed: September 14, 2018
    Publication date: January 10, 2019
    Inventors: Takeshi TSUKUBA, Tomoyuki YAMAMOTO, Tomohiro IKAI, Yukinobu YASUGI
  • Patent number: 10171823
    Abstract: Even in a case in which a color format is a format other than 4:2:0, an image coding device and an image decoding device capable of accurately locating a reference pixel position in inter-layer image prediction are realized. A hierarchical moving image decoding device (1) includes a parameter set decoding section (12) that decodes a scaled reference layer offset syntax that is coded in a chroma pixel unit and a predicted image generation section (1442) that derives a scale based on a scaled reference layer offset which is a product of the scaled reference layer offset syntax and a luminance chroma size ratio of a target layer picture and generates a predicted image.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: January 1, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Takeshi Tsukuba
  • Publication number: 20180367782
    Abstract: An image decoding device which can extract an independent layer without rewriting of syntax and cause a non-scalable decoder to reproduce the extracted is realized. An image decoding device (1) includes a NAL-unit header decoding unit (211) that decodes a layer ID of an SPS, a dependency layer information decoding unit (2101) that decodes dependency layer information, and a profile level information decoding unit (2102) that decodes profile level information from a VPS. The decoding unit (2102) decodes the profile level information also from the SPS in a case where it is determined that a layer indicated by the layer ID is an independent layer, based on the dependency layer information.
    Type: Application
    Filed: August 23, 2018
    Publication date: December 20, 2018
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Tomohiro IKAI, Tomoyuki YAMAMOTO, Takeshi TSUKUBA
  • Patent number: 10158887
    Abstract: The amount of processing is reduced with high coding efficiency maintained. There is provided an arithmetic decoding device including syntax decoding means for decoding each of at least a first syntax element and a second syntax element indicating a transform coefficient using arithmetic decoding with a context or arithmetic decoding without a context. The syntax decoding means performs decoding that at least includes not decoding the first syntax element and decoding the second syntax element using the arithmetic decoding without a context, and decoding the first syntax element using the arithmetic decoding with a context and decoding the second syntax element using the arithmetic decoding without a context.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: December 18, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomohiro Ikai, Yukinobu Yasugi, Tomoyuki Yamamoto, Takeshi Tsukuba
  • Patent number: 10142653
    Abstract: A hierarchical image decoding apparatus, a hierarchical image coding apparatus, and a hierarchical coded data transformation apparatus where the hierarchical image decoding apparatus includes a parameter set decoder that decodes scale adjustment information, and a predictive image generator that generates a predictive image on the basis of the scale adjustment information, and the hierarchical image coding apparatus includes a parameter set encoder that encodes scale adjustment information, and the hierarchical coded data transformation apparatus includes a parameter set adjustor that transforms input hierarchically coded data based on inputted information of interest region, and adjusts scale adjustment information such that inter-layer scales derived from the hierarchically coded data before and after transformation coincide with each other.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: November 27, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Takeshi Tsukuba
  • Patent number: 10136161
    Abstract: Since the size of a lookup table necessary to retain a partition pattern list is large in DMM 1 prediction, it is difficult to dispose the lookup table in a cache. For this reason, access to an external memory occurs at each time of access to the lookup table, and thus a problem may occur in that a processing speed is lowered. In the DMM 1 prediction, the lookup table for retaining a partition pattern of a first size is deleted, a partition pattern of a second size smaller than the first size is scaled to the first size, and the partition pattern of the first size is generated.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: November 20, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi Tsukuba, Tomohiro Ikai
  • Patent number: 10136151
    Abstract: An image decoding device is equipped with a header information decoding means for decoding profile/level information included in a video parameter set after decoding byte-aligned 16-bit extension information (next_essential_info_byte_offset) in the video parameter set.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: November 20, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi Tsukuba, Tomoyuki Yamamoto, Tomohiro Ikai, Yukinobu Yasugi, Sachin G. Deshpande
  • Patent number: 10129548
    Abstract: To reduce the amount of processing related to coding and decoding of transform coefficients, a sub-block coefficient presence/absence flag indicating whether or not at least one non-zero transform coefficient is included is decoded for each of two or more sub-blocks obtained by dividing a unit region, and a context index of a target sub-block is derived on the basis of transform coefficient presence/absence flags each indicating whether or not a transform coefficient is 0. In accordance with the sub-block coefficient presence/absence flags of adjacent sub-blocks that are adjacent to the target sub-block, the context index of the target sub-block is derived.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: November 13, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi Tsukuba, Tomohiro Ikai, Tomoyuki Yamamoto, Yukinobu Yasugi
  • Patent number: 10116966
    Abstract: A hierarchical moving image decoding device (1) includes a profile information decoding unit (1221a) that decodes/configures sublayer profile information after decoding a sublayer profile present flag regarding respective sublayers, and a level information decoding unit (1221b) that decodes/configures sublayer level information.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: October 30, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Tsukuba, Tomoyuki Yamamoto, Tomohiro Ikai, Yukinobu Yasugi
  • Publication number: 20180302641
    Abstract: An image predicting device for improving the accuracy of an intra LM predicted image or an illuminance predicted image is provided. The image predicting device includes a linear prediction parameter derivation section that derives linear prediction parameters a and b and a linear prediction section that generates a predicted image on the basis of the linear prediction parameters. The linear prediction parameter derivation section includes means for deriving the linear prediction parameter a from a first parameter a1 and a second parameter a2.
    Type: Application
    Filed: August 26, 2016
    Publication date: October 18, 2018
    Inventors: Tomohiro IKAI, Takeshi TSUKUBA
  • Patent number: 10104362
    Abstract: An image decoding device which can extract an independent layer without rewriting of syntax and cause a non-scalable decoder to reproduce the extracted is realized. An image decoding device (1) includes a NAL-unit header decoding unit (211) that decodes a layer ID of an SPS, a dependency layer information decoding unit (2101) that decodes dependency layer information, and a profile level information decoding unit (2102) that decodes profile level information from a VPS. The decoding unit (2102) decodes the profile level information also from the SPS in a case where, it is determined that a layer indicated by the layer ID is an independent layer, based on the dependency layer information.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: October 16, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomohiro Ikai, Tomoyuki Yamamoto, Takeshi Tsukuba
  • Publication number: 20180288408
    Abstract: A predicted image is generated by means of a method with which it is easy for parallel processing for a plurality of pixels to be executed, in a case where each pixel of the predicted image is derived according to a distance from a reference region and with reference to an unfiltered reference pixel. A predicted pixel value constituting the predicted image is derived by applying weighted sum in which a weighting coefficient is used with respect to a filtered predicted pixel value in a target pixel within a prediction block, and at least one or more unfiltered reference pixel values, and the weighting coefficient for the unfiltered reference pixel values is derived as a product of a reference intensity coefficient that is determined according to a prediction direction indicated by a prediction mode, and a distance weighting that monotonically decreases according to an increase in a reference distance for the target pixel.
    Type: Application
    Filed: August 24, 2016
    Publication date: October 4, 2018
    Inventors: Tomohiro IKAI, Takeshi TSUKUBA, Tomoyuki YAMAMOTO