Patents by Inventor Akiyuki Tanizawa

Akiyuki Tanizawa 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).

  • Image encoding and decoding method with predicted and representative motion information
    Patent number: 9900594
    Abstract: A method of dividing an input image signal into pixel blocks, and performing inter-prediction on the divided pixel blocks. This method includes selecting predicted motion information from a motion information buffer storing motion information in an encoded region, and predicting motion information of an encoding target block by using the predicted motion information. The method further includes acquiring representative motion information from a plurality of items of motion information in an encoded region in accordance with first information indicating a method of selecting the predicted motion information, thereby obtaining only the representative motion information.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: February 20, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Taichiro Shiodera, Akiyuki Tanizawa, Tomoo Yamakage, Takeshi Chujoh
  • Encoding device, decoding device, encoding method, and decoding method
    Patent number: 9872027
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: January 16, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh, Taichiro Shiodera
  • IMAGE ENCODING METHOD AND IMAGE DECODING METHOD
    Publication number: 20170374380
    Abstract: According to one embodiment, an image encoding method includes selecting a motion reference block from an encoded pixel block to which an inter prediction is applied. The method includes selecting one or more available blocks from the motion reference block. The method includes selecting a selection block from the available blocks. The method includes generating a predicted image of the encoding target block using motion information of the selection block. The method includes encoding a prediction error between the predicted image and an original image. The method includes encoding selection information specifying the selection block by referring to a code table decided according to a number of the available blocks.
    Type: Application
    Filed: September 8, 2017
    Publication date: December 28, 2017
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Taichiro SHIODERA, Saori ASAKA, Akiyuki TANIZAWA, Takeshi CHUJOH
  • IMAGE ENCODING METHOD AND IMAGE DECODING METHOD
    Publication number: 20170366822
    Abstract: According to one embodiment, an image encoding method includes selecting a motion reference block from an already-encoded pixel block. The method includes selecting an available block including different motion information from the motion reference block, and selecting a selection block from the available block. The method includes generating a predicted image of the encoding target block using motion information of the selection block. The method includes encoding a prediction error between the predicted image and an original image. The method includes encoding selection information identifying the selection block by referring to a code table decided according to a number of the available block.
    Type: Application
    Filed: September 7, 2017
    Publication date: December 21, 2017
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Taichiro Shiodera, Saori Asaka, Akiyuki Tanizawa, Takeshi Chujoh
  • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, AND DECODING METHOD
    Publication number: 20170359585
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Application
    Filed: August 17, 2017
    Publication date: December 14, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh, Taichiro Shiodera
  • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, AND DECODING METHOD
    Publication number: 20170347104
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Application
    Filed: August 17, 2017
    Publication date: November 30, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akiyuki TANIZAWA, Takeshi Chujoh, Taichiro Shiodera
  • Encoding device, decoding device, encoding method, and decoding method for efficient coding
    Patent number: 9826247
    Abstract: According to an embodiment, an encoding device includes an index setting unit, an index reconfiguring unit, and an entropy encoding unit. The index setting unit sets an index and a weighting factor. The index represents information of a reference image. The index reconfiguring unit predicts a reference value of the weighting factor. The reference value indicates a factor to be set if a difference of pixel value between a reference image and a target image to be encoded is less than or equal to a specific value. The entropy encoding unit encodes a difference value between the weighting factor and the reference value.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: November 21, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh
  • Encoding device, decoding device, encoding method, and decoding method
    Patent number: 9819943
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: November 14, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh, Taichiro Shiodera
  • Image encoding method and image decoding method
    Patent number: 9794587
    Abstract: According to one embodiment, an image encoding method includes selecting a motion reference block from an already-encoded pixel block. The method includes selecting an available block including different motion information from the motion reference block, and selecting a selection block from the available block. The method includes generating a predicted image of the encoding target block using motion information of the selection block. The method includes encoding a prediction error between the predicted image and an original image. The method includes encoding selection information identifying the selection block by referring to a code table decided according to a number of the available block.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: October 17, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Taichiro Shiodera, Saori Asaka, Akiyuki Tanizawa, Takeshi Chujoh
  • Reproduction device, encoding device, and reproduction method
    Patent number: 9788025
    Abstract: According to an embodiment, a reproduction device includes an acquirer, a decoder, and a synthesizer. The acquirer is configured to acquire transmission information including first and second coded data. The first and second coded data are generated by encoding first and second image data, respectively. At least one of the first and the second image data is lossy encoded. The first and second image data being generated by performing conversion processes different from each other on original image data. The decoder is configured to decode the first and second coded data to generate first and second decoded data. The synthesizer is configured to synthesize the first and the second decoded data with adjusting pixel positions of the first and the second decoded data so that the pixel positions of the first and the second decoded data are identical to each other to generate reproduction image data.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: October 10, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takeshi Chujoh, Shunichi Gondo, Akiyuki Tanizawa, Tomoya Kodama, Takayuki Itoh
  • Encoding device, decoding device, encoding method, and decoding method
    Patent number: 9787994
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: October 10, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh, Taichiro Shiodera
  • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, AND DECODING METHOD
    Publication number: 20170244973
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Application
    Filed: May 9, 2017
    Publication date: August 24, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akiyuki TANIZAWA, Takeshi CHUJOH, Taichiro SHIODERA
  • Image encoding apparatus and image decoding apparatus employing intra preciction and direction transform matrix
    Patent number: 9706226
    Abstract: An image encoding apparatus includes a setting unit configured to set a combination of a vertical transform matrix and a horizontal transform matrix corresponding to the target image. The combination includes any of a plurality of transform matrices including a first transform matrix and a second transform matrix which increases a coefficient density compared to the first transform matrix if a one-dimensional orthogonal transformation in a direction orthogonal to a line of a group of reference pixels on at least one line is performed on the prediction error in the intra-prediction mode in which the group of reference pixels is referenced to generate an intra-prediction image.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: July 11, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Jun Yamaguchi, Akiyuki Tanizawa
  • VIDEO ENCODING APPARATUS AND A VIDEO DECODING APPARATUS
    Publication number: 20170171556
    Abstract: A video encoding apparatus is a video encoding apparatus for subjecting a video image to motion compensated prediction coding, comprising an acquisition module to acquire available blocks of blocks having motion vectors from encoded blocks adjacent to a to-be-encoded block and number of the available blocks, an acquisition/selection module to select one selection block from the encoded available blocks, a selection information encoder to encode selection information specifying the selection block using a code table corresponding to the number of available blocks, and an image encoder to subject the to-be-encoded block to motion compensated prediction coding using a motion vector of the selection block.
    Type: Application
    Filed: March 1, 2017
    Publication date: June 15, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: SAORI ASAKA, Takeshi Chujoh, Akiyuki Tanizawa, Goki Yasuda, Naofumi Wada, Takashi Watanabe
  • Encoding device, decoding device, encoding method, and decoding method
    Patent number: 9681138
    Abstract: According to an embodiment, an encoding device includes an index setting unit and an encoding unit. The index setting unit generates a common index in which reference indices of one or more reference images included in a first index and a second index are sorted in a combination so as not to include a same reference image in accordance with a predetermined scanning order. The first index representing a combination of the one or more reference images referred to by a first reference image. The second index representing a combination of the one or more reference images referred to by a second reference image. The encoding unit encodes the common index.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: June 13, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh, Taichiro Shiodera
  • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, AND DECODING METHOD FOR CODING EFFICIENCY
    Publication number: 20170163984
    Abstract: According to an embodiment, an encoding device includes a deriving unit and an encoding unit. The deriving unit is configured to derive a first reference value based on fixed point precision representing roughness of a weighting factor that is used for multiplying a reference image. The encoding unit is configured to encode a first difference value that is a difference value between the weighting factor and the first reference value and the fixed point precision. The weighting factor is included in a first range of predetermined bit precision having the first reference value at approximate center. The first difference value is in the predetermined range.
    Type: Application
    Filed: February 21, 2017
    Publication date: June 8, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh
  • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, AND DECODING METHOD FOR EFFICIENT CODING
    Publication number: 20170164006
    Abstract: According to an embodiment, an encoding device includes: an index setting unit sets an index that represents information of a reference image and a weighting factor; an index reconfiguring unit predicts a reference value of the weighting factor, wherein the reference value indicates a factor to be set if a difference of pixel value between a reference image and a target image to be encoded is less than or equal to a specific value; and an entropy encoding unit encodes a difference value between the weighting factor and the reference value.
    Type: Application
    Filed: February 15, 2017
    Publication date: June 8, 2017
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Akiyuki TANIZAWA, Takeshi CHUJOH
  • ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, AND DECODING METHOD FOR CODING EFFICIENCY
    Publication number: 20170163998
    Abstract: According to an embodiment, an encoding device includes a deriving unit and an encoding unit. The deriving unit is configured to derive a first reference value based on fixed point precision representing roughness of a weighting factor that is used for multiplying a reference image. The encoding unit is configured to encode a first difference value that is a difference value between the weighting factor and the first reference value and the fixed point precision. The weighting factor is included in a first range of predetermined bit precision having the first reference value at approximate center. The first difference value is in the predetermined range.
    Type: Application
    Filed: February 21, 2017
    Publication date: June 8, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akiyuki TANIZAWA, Takeshi CHUJOH
  • Video encoding apparatus and a video decoding apparatus
    Patent number: 9628794
    Abstract: A video encoding apparatus is a video encoding apparatus for subjecting a video image to motion compensated prediction coding, comprising an acquisition module to acquire available blocks of blocks having motion vectors from encoded blocks adjacent to a to-be-encoded block and number of the available blocks, an acquisition/selection module to select one selection block from the encoded available blocks, a selection information encoder to encode selection information specifying the selection block using a code table corresponding to the number of available blocks, and an image encoder to subject the to-be-encoded block to motion compensated prediction coding using a motion vector of the selection block.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: April 18, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Saori Asaka, Takeshi Chujoh, Akiyuki Tanizawa, Goki Yasuda, Naofumi Wada, Takashi Watanabe
  • Encoding device, decoding device, encoding method, and decoding method for coding efficiency
    Patent number: 9621914
    Abstract: According to an embodiment, an encoding device includes a deriving unit and an encoding unit. The deriving unit is configured to derive a first reference value based on fixed point precision representing roughness of a weighting factor that is used for multiplying a reference image. The encoding unit is configured to encode a first difference value that is a difference value between the weighting factor and the first reference value and the fixed point precision. The weighting factor is included in a first range of predetermined bit precision having the first reference value at approximate center. The first difference value is in the predetermined range.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: April 11, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiyuki Tanizawa, Takeshi Chujoh