Patents by Inventor Tomohiro Ikai

Tomohiro Ikai 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).

  • Publication number: 20220014762
    Abstract: A video decoding apparatus includes matrix reference pixel derivation circuitry that derives reference samples by using top neighboring samples and left neighboring samples of a current block, weight matrix derivation circuitry that derives a weight matrix, matrix prediction image derivation circuitry that derives a prediction image, and matrix prediction image interpolation circuitry that derives a predicted image by using the prediction image. A size index is derived according to a value of a target block width and a value of a target block height. A prediction size is derived using the size index. In a case that a first condition, that both the value of the transform block width and the value of the transform block height are equal to 4, is true, the size index is set equal to 0 and the prediction size is set equal to 4.
    Type: Application
    Filed: September 27, 2021
    Publication date: January 13, 2022
    Inventors: Yukinobu YASUGI, Eiichi SASAKI, Tomohiro IKAI, Tomoko AONO
  • Patent number: 11223842
    Abstract: To achieve a reduction in the amount of coding taken in the use of an asymmetric partition and to implement efficient encoding/decoding processes exploiting the characteristics of the asymmetric partition. In a case that a CU information decoding unit decodes information for specifying an asymmetric partition (AMP; Asymmetric Motion Partition) as a partition type, an arithmetic decoding unit is configured to decode binary values by switching between arithmetic decoding that uses contexts and arithmetic decoding that does not use contexts in accordance with the position of the binary values.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: January 11, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Yukinobu Yasugi
  • Publication number: 20210409760
    Abstract: To achieve a reduction in the amount of coding taken in the use of an asymmetric partition and to implement efficient encoding/decoding processes exploiting the characteristics of the asymmetric partition. An image decoding device includes a motion compensation parameter derivation unit configured to derive a motion compensation parameter indicating either a uni-prediction scheme or a bi-prediction scheme. In a case that a prediction unit has a size less than or equal to a predetermined value, the motion compensation parameter derivation unit is configured to derive the motion compensation parameter by switching between the prediction schemes.
    Type: Application
    Filed: September 9, 2021
    Publication date: December 30, 2021
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki YAMAMOTO, Tomohiro IKAI, Yukinobu YASUGI
  • Publication number: 20210409757
    Abstract: To improve a coding efficiency. There are included a PU level search unit configured to search for a motion vector for each prediction block by using a matching process. and a sub-block level search unit configured to search for a motion vector of each of sub-blocks in the prediction block, wherein a precision of a local search by the PU level search unit is lower than a precision of a local search by the sub-block level search unit.
    Type: Application
    Filed: September 13, 2021
    Publication date: December 30, 2021
    Inventors: Tomohiro Ikai, Tomoyuki Yamamoto
  • Publication number: 20210409745
    Abstract: In a case that luminance information is used for a chrominance prediction in a separate coding tree structure, there is a problem that chrominance blocks cannot be decoded before all luminance blocks constituting a tree are decoded. An image decoding apparatus that splits an image into coding tree units (CTUs) that are rectangular for processing includes a CT information decoding unit configured to split a CTU of the CTUs into coding trees CTs and to process one or more color components as a single coding tree using one coding tree CT of the coding trees CTs or process two or more color components as a separate coding tree using two or more coding trees CTs of the coding trees CTs depending on a tree mode, a CU decoding unit configured to decode a split flag indicating whether to further split a CT of the CTs and to recursively perform block splitting, and an intra predictor configured to use a decoded image of one color component to generate a prediction image of another color component.
    Type: Application
    Filed: September 10, 2021
    Publication date: December 30, 2021
    Inventors: TOMOHIRO IKAI, Tomoko Aono
  • Patent number: 11212551
    Abstract: A load in processing of searching for a motion vector is reduced. In order to solve the problem described above, a motion vector derivation apparatus (3032, 3036 to 3038) according to one aspect of the present invention that derives a motion vector to be referred to for generating a prediction image to be used for coding or decoding of a video includes a motion vector search unit (30373) configured to search for a motion vector on a prediction unit basis through matching processing. The motion vector search unit (30373) is configured to stop search of the motion vector, depending on whether or not a conditional expression according to a pixel bit-depth is satisfied.
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: December 28, 2021
    Assignees: SHARP KABUSHIKI KAISHA, FG INNOVATION COMPANY LIMITED
    Inventors: Takeshi Chujoh, Tomoko Aono, Tomohiro Ikai, Eiichi Sasaki, Yukinobu Yasugi
  • Publication number: 20210400285
    Abstract: A mechanism is provided that implements video coding and decoding such that only a specific partial image region on a screen can be independently decoded. A video decoding apparatus (31) according to an aspect of the present invention configures, in intra prediction, inter prediction, loop filter processing, or the like, a partial image region in a picture, handles a region outside the partial image region in a similar manner to a region outside the picture, and does not apply such restriction to a non-partial image region other than the partial image region in the picture.
    Type: Application
    Filed: August 22, 2019
    Publication date: December 23, 2021
    Inventors: Takeshi Chujoh, Yukinobu Yasugi, Eiichi Sasaki, Tomoko Aono, Tomohiro Ikai
  • Patent number: 11206429
    Abstract: An image decoding device (31) includes a transform coefficient decoding unit (311) configured to decode a transform coefficient for a transform tree included in a coding unit. In the transform tree, the transform coefficient decoding unit splits a transform unit corresponding to luminance and then decodes the transform coefficient related to the luminance, and does not split the transform unit corresponding to chrominance and decodes the transform coefficient related to the chrominance.
    Type: Grant
    Filed: January 19, 2021
    Date of Patent: December 21, 2021
    Assignees: SHARP KABUSHIKI KAISHA, FG INNOVATION COMPANY LIMITED
    Inventors: Tomohiro Ikai, Tomoko Aono, Yukinobu Yasugi, Tomonori Hashimoto
  • Publication number: 20210392356
    Abstract: An image decoding apparatus is implemented that can suppress a decrease in coding efficiency in a case that a high compression rate is achieved. The image decoding apparatus includes a parameter decoder, and the parameter decoder decodes a skip flag indicating whether a skip mode is applied, and in a case that the skip flag does not indicate the skip mode, decodes a merge flag indicating whether a merge mode is applied, and in a case that the merge flag does not indicate the merge mode, decodes an MMVD flag indicating whether an MMVD mode is applied.
    Type: Application
    Filed: December 3, 2019
    Publication date: December 16, 2021
    Inventors: Takeshi CHUJOH, Eiichi SASAKI, Tomonori HASHIMOTO, Tomoko AONO, Tomohiro IKAI
  • Publication number: 20210392344
    Abstract: A prediction image generation is provided. First and second luminance values corresponding, respectively, to first and second positions on a luminance image are derived. First and second chrominance values corresponding, respectively, to first and second positions on a chrominance image are derived. First and second difference values indicate, respectively, a first difference between the first and second luminance values and a second difference between the first and second chrominance values. A shift value is derived for a shift operation and a first parameter is derived by using the first and second difference values, and a second parameter is derived by using the second luminance value, the second chrominance value, the first parameter, and the shift value according to a formula. The shift value is set to a first threshold if a value derived by using the first and second difference values is less than the first threshold.
    Type: Application
    Filed: December 26, 2019
    Publication date: December 16, 2021
    Inventors: FRANK BOSSEN, EIICHI SASAKI, YUKINOBU YASUGI, TOMOHIRO IKAI
  • Publication number: 20210385492
    Abstract: An image decoding apparatus decodes a transform coefficient on a transform unit basis, decodes a flag scaling_matrix_for_lfnst_disabled_flag indicating whether to apply a quantization matrix during a non-separable transform, scales the transform coefficient by utilizing a scaling list, and performs a non-separable transform in accordance with a non-separable transform index lfnst_idx. In a case that scaling_matrix_for_lfnst_disabled_flag==1 and lfnst_idx !=0 and a size of a transform block is equal to or greater than a prescribed size, instead of scaling using the quantization matrix according to a position of the transform coefficient, uniform quantization not depending on the position of the transform coefficient is performed.
    Type: Application
    Filed: August 16, 2021
    Publication date: December 9, 2021
    Inventors: Tomonori Hashimoto, Tomohiro Ikai, Tomoko Aono
  • Patent number: 11196993
    Abstract: An image decoding apparatus includes: a first filter unit configured to apply a first filter to an image (a luminance image and a chrominance image); a second filter unit configured to apply a second filter to an output image of the first filter; a filter set derivation unit configured to decode a filter coefficient from coded data; and a third filter unit configured to apply a third filter to an output image of the second filter by using the filter coefficient. In a case that the third filter unit performs filter processing for the luminance image by using a luminance output image of the second filter, the third filter unit performs processing of clipping an amount of change of a pixel value through the filter processing within a prescribed range of value.
    Type: Grant
    Filed: August 20, 2020
    Date of Patent: December 7, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yukinobu Yasugi, Eiichi Sasaki, Tomohiro Ikai
  • Publication number: 20210377538
    Abstract: The present invention includes: a CCLM prediction derivation portion, for deriving a first parameter and a second parameter by using a sampled luminance value downsampled according to a chrominance format and an intra-frame prediction mode; and a CCLM prediction filter portion, for deriving a prediction image by using the first parameter and the second parameter, wherein the CCLM prediction derivation portion derives the first parameter by deriving a logarithmic value of a luminance difference value, deriving a first value by right-shifting a second value related to the luminance difference value by the logarithmic value, and using a third value acquired by multiplying a fourth value by a chrominance difference value and derives the second parameter by using the first parameter.
    Type: Application
    Filed: December 3, 2019
    Publication date: December 2, 2021
    Inventors: YUKINOBU YASUGI, TOMOHIRO IKAI
  • Patent number: 11184622
    Abstract: A video decoding apparatus includes: a matrix reference pixel derivation unit configured to derive, as a reference image, an image obtained by down-sampling an image adjacently above a target block and an image adjacently leftward of the target block; a weight matrix derivation unit configured to derive a matrix of weighting factors in accordance with an intra prediction mode and a target block size; a matrix prediction image derivation unit configured to derive a prediction image by using a product of elements of the reference image and elements of the matrix of the weighting factors; and a matrix prediction image interpolation unit deriving, as a prediction image, the prediction image or an image obtained by interpolating the prediction image, wherein the weight matrix derivation unit derives a matrix with a size of a width equal to or smaller than a width of the target block size and a height equal to or smaller than a height of the target block size.
    Type: Grant
    Filed: September 11, 2020
    Date of Patent: November 23, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yukinobu Yasugi, Eiichi Sasaki, Tomohiro Ikai, Tomoko Aono
  • Patent number: 11184636
    Abstract: In a case of referring to information between pictures by means of inter prediction, the entire picture needs to be decoded even in a case of decoding a small region. In a case of referring to information within a picture by means of intra prediction, referring to information across a tile boundary is not possible. In a case that a pixel pointed by a sub-block level motion vector of a target block that is calculated by scaling based on an available motion vector acquired from a spatial neighboring block or a temporal neighboring block is not present within a tile sequence, a process of replacing the pixel value with a pixel value within the tile sequence is performed. In a case of referring to a pixel outside of a tile by means of intra prediction, a process of replacing the pixel value with that of a pixel within the tile is performed.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: November 23, 2021
    Assignees: SHARP KABUSHIKI KAISHA, FG INNOVATION COMPANY LIMITED
    Inventors: Tomoko Aono, Tomohiro Ikai, Takeshi Chujoh, Tomonori Hashimoto, Yukinobu Yasugi
  • Publication number: 20210352283
    Abstract: An adaptive offset filter (60) adds an offset to the pixel value of each pixel forming an input image. The adaptive offset filter (60) refers to offset-type specifying information, sets offset attributes for a subject unit area of the input image, decodes an offset having a bit width corresponding to an offset value range included in the set offset attributes, and adds the offset to the pixel value of each pixel forming the input image.
    Type: Application
    Filed: July 20, 2021
    Publication date: November 11, 2021
    Applicant: HUAWEI TECHNOLOGIES CO.,LTD.
    Inventors: Takanori Yamazaki, Tomohiro Ikai, Tomoyuki Yamamoto, Yukinobu Yasugi
  • Publication number: 20210352286
    Abstract: Complexity of coding/decoding of a video is reduced. An image decoding apparatus (31) includes a CN information decoder (10) configured to hierarchically split a coding node by at least any of binary tree split and ternary tree split. The CN information decoder refers to a method of splitting an immediately higher node, which is a node one generation higher than a target node, to restrict a method of splitting the target node.
    Type: Application
    Filed: June 7, 2021
    Publication date: November 11, 2021
    Inventors: Yukinobu YASUGI, Tomoko AONO, Tomohiro IKAI
  • Patent number: 11153600
    Abstract: To improve a coding efficiency. There are included a PU level search unit configured to search for a motion vector for each prediction block by using a matching process, and a sub-block level search unit configured to search for a motion vector of each of sub-blocks in the prediction block, wherein a precision of a local search by the PU level search unit is lower than a precision of a local search by the sub-block level search unit.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: October 19, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomohiro Ikai, Tomoyuki Yamamoto
  • Publication number: 20210297693
    Abstract: An apparatus includes an inter prediction unit configured to decode multiple reference picture list structures and to select one reference picture list structure from the multiple reference picture list structures on a per picture basis or on a per slice basis, wherein in the multiple reference picture list structures, the number of all reference pictures is one or more.
    Type: Application
    Filed: March 15, 2021
    Publication date: September 23, 2021
    Inventors: TAKESHI CHUJOH, TOMOHIRO IKAI, TOMOKO AONO, EIICHI SASAKI, TOMONORI HASHIMOTO, TIANYANG ZHOU, YUKINOBU YASUGI
  • Patent number: 11128889
    Abstract: To achieve a reduction in the amount of coding taken in the use of an asymmetric partition and to implement efficient encoding/decoding processes exploiting the characteristics of the asymmetric partition. An image decoding device includes a motion compensation parameter derivation unit configured to derive a motion compensation parameter indicating either a uni-prediction scheme or a bi-prediction scheme. In a case that a prediction unit has a size less than or equal to a predetermined value, the motion compensation parameter derivation unit is configured to derive the motion compensation parameter by switching between the prediction schemes.
    Type: Grant
    Filed: June 9, 2020
    Date of Patent: September 21, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Yamamoto, Tomohiro Ikai, Yukinobu Yasugi