Patents by Inventor Seishi Takamura

Seishi Takamura 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: 20220007049
    Abstract: A predictive image acquisition device is a predictive image acquisition device for associating an observation signal, the observation signal being a signal obtained from an original image serving as a decoding target image and being a lower dimensional signal than the original image, a first predictive image having a high correlation with the original image, and a second predictive image having a high correlation with the original image with each other to obtain a combined predictive image, and includes an interpolation factor acquisition unit configured to obtain an interpolation factor set for each pixel of the combined predictive image from the first predictive image, the second predictive image, and the observation signal, and a combined predictive image acquisition unit configured to combine the first predictive image and the second predictive image for each pixel using the interpolation factor to obtain the combined predictive image, and the pixels constituting the observation signal are expressed by a
    Type: Application
    Filed: November 7, 2019
    Publication date: January 6, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoko SOGABE, Shiori SUGIMOTO, Seishi TAKAMURA, Atsushi SHIMIZU
  • Publication number: 20210329232
    Abstract: An image processing device that updates a pixel value of a processing target image and generates a new image generates a first feature vector based on the processing target image and a first feature map generated with at least one pre-decided filter; updates the processing target image to generate an updated image; generates a second feature vector based on the updated image and a second feature map generated with at least one pre-decided filter; performs quality evaluation of the updated image based on the first and second feature vectors and generates a quality feedback vector which is a vector based on a result of the quality evaluation; performs an encoding amount evaluation on the updated image and generates an encoding amount feedback vector which is a vector based on a result of the encoding amount evaluation; and determines an updating amount in updating of the updated image based on the quality feedback vector and the encoding amount feedback vector.
    Type: Application
    Filed: August 26, 2019
    Publication date: October 21, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shiori SUGIMOTO, Seishi TAKAMURA, Atsushi SHIMIZU
  • Publication number: 20210329253
    Abstract: A coding amount estimation device includes: a feature vector generation unit that generates a feature vector on the basis of a feature map generated by an estimation target image and at least one filter set in advance; and a coding amount evaluation unit that evaluates a coding amount of the estimation target image on the basis of the feature vector.
    Type: Application
    Filed: August 26, 2019
    Publication date: October 21, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shiori SUGIMOTO, Seishi TAKAMURA, Atsushi SHIMIZU
  • Patent number: 10298945
    Abstract: Regions based on which an interpolation method of a fractional-accuracy pixel is switched are optimized, and the interpolation method is switched for each of the divided regions, thereby reducing residual energy of inter-frame prediction with motion compensation.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: May 21, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shohei Matsuo, Yukihiro Bandoh, Seishi Takamura, Hirohisa Jozawa
  • Patent number: 9813709
    Abstract: Setting a reference pixel signal from a decoded pixel signal in intra-prediction in which a prediction signal is generated in the same frame, acquiring prediction mode identification information that identifies an intra-prediction mode, generating a prediction signal based on the reference pixel signal and the prediction mode identification information, making a determination regarding correction of the prediction signal using a reference pixel having a shorter distance from a pixel that is a prediction target in the intra-prediction mode identified by the prediction mode identification information, and correcting the generated prediction signal according to a result of the determination are included in order to provide an image encoding method and an image decoding method capable of improving subjective image quality and coding efficiency using a closer decoded pixel in an intra-prediction process.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: November 7, 2017
    Assignee: Nippon Telegraph And Telephone Corporation
    Inventors: Shohei Matsuo, Masaaki Matsumura, Hiroshi Fujii, Seishi Takamura, Atsushi Shimizu
  • Patent number: 9693053
    Abstract: A video encoding device uses motion-compensated inter-frame prediction by dividing an image into blocks, each block a predetermined size, designating a first component value of a plurality of component values of a motion vector (MV) between an encoding target block and a neighboring block, designating a second component value, and encoding each first and second component values; a first component encoding means encodes a difference value of a first component and a second component encoding means, which obtains a probability of occurrence of a candidate value for the second component value of the MV of the encoding target block, based on a difference value between the first component value of the neighboring block MV and the first component value of the encoding target block MV and the second component value of the neighboring block MV, specifies a codeword of the second component value, encoding it based on the occurrence probability.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: June 27, 2017
    Assignee: Nippon Telegraph And Telephone Corporation
    Inventors: Yukihiro Bandoh, Shohei Matsuo, Seishi Takamura, Hirohisa Jozawa
  • Patent number: 9667963
    Abstract: The prediction error energy in inter-frame prediction with motion compensation is reduced and the coding efficiency is improved.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: May 30, 2017
    Assignee: Nippon Telegraph And Telephone Corporation
    Inventors: Shohei Matsuo, Yukihiro Bandoh, Seishi Takamura, Hirohisa Jozawa
  • Patent number: 9609318
    Abstract: A reduction in residual energy of inter-frame prediction with motion compensation and improvement in encoding efficiency are achieved by using a region-dividing type adaptive interpolation filter that takes an edge property of a picture into consideration. An edge calculation unit calculates edge information from reference picture data designated by a motion vector. A region dividing unit divides an encoding target frame into a plurality of regions that are units to which interpolation filters are adaptively applied based on the edge information. A filter coefficient optimizing unit optimizes an interpolation filter for a fractional-accuracy pixel for each of the regions. A reference picture interpolating unit interpolates the fractional-accuracy pixel of a reference picture using the optimized interpolation filter, and a predictive encoding unit performs predictive encoding using motion compensation of fractional-accuracy.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: March 28, 2017
    Assignee: Nippon Telegraph And Telephone Corporation
    Inventors: Shohei Matsuo, Yukihiro Bandoh, Seishi Takamura, Hirohisa Jozawa
  • Patent number: 9438912
    Abstract: The computational complexity of a denoising filter is reduced while suppressing a reduction in coding efficiency. In a video encoding/decoding apparatus which uses a loop filter, a deviation degree calculating unit calculates the degree of deviation between a denoising target pixel and a surrounding pixel using a decoded image. A template shape setting unit limits a template shape so that its size is proportional to the degree of deviation relative to the maximum value of the degree of deviation in the decoded image. When noise of the target pixel is removed, weighted in accordance with the degree of similarity between a template of the target pixel and a template of each of search points in a search shape and the weighted sum of pixel values at the search points, the loop filter performs template matching using the limited template shape and removes noise of the target pixel.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: September 6, 2016
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masaaki Matsumura, Seishi Takamura, Atsushi Shimizu, Hirohisa Jozawa
  • Patent number: 9386322
    Abstract: A scalable video encoding method of performing encoding by predicting an upper-layer signal having a relatively high spatial resolution by means of interpolation using an immediately-lower-layer signal having a relatively low spatial resolution. The method computes a first weighting coefficient for each image area of a predetermined unit size in a search for estimating a motion between an encoding target image area in an upper layer and a reference image area, where the first weighting coefficient is computed based on a brightness variation between an image area, which belongs to an immediately-lower layer and has the same spatial position as the encoding target image area, and the reference image area; and performs a motion estimation using a signal which is obtained by correcting a decoded signal of the reference image area by the first weighting coefficient and functions as an estimated signal in the motion estimation, so as to compute a motion vector.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: July 5, 2016
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kazuya Hayase, Yukihiro Bandoh, Seishi Takamura, Kazuto Kamikura, Yoshiyuki Yashima
  • Patent number: 9363515
    Abstract: In an image processing apparatus, an edge direction detection unit calculates an edge direction using a denoising target image. A search shape setting unit sets a search shape in which the number of search points along the direction perpendicular to the edge direction is smaller than the number of search points along the edge direction, using the calculated edge direction as an index used for limiting the search shape. When noise of a target pixel is removed with a weight in accordance with the degree of template similarity between a template for the target pixel and a template for each of search points within a search shape and the weighted sum of pixel values at the search points, a filter execution unit executes a process of performing template matching on only search points within the set search shape and removing the noise of the target pixel.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: June 7, 2016
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masaaki Matsumura, Seishi Takamura, Atsushi Shimizu, Hirohisa Jozawa
  • Patent number: 9154789
    Abstract: A motion vector predictive encoding method, a motion vector decoding method, a predictive encoding apparatus, a decoding apparatuses, and storage media storing motion vector predictive encoding and decoding programs are provided, thereby reducing the amount of generated code with respect to the motion vector, and improving the efficiency of the motion-vector prediction. If the motion-compensating mode of the target small block to be encoded is the global motion compensation, the encoding mode of an already-encoded small block is the interframe coding mode, and the motion-compensating mode of the already-encoded small block is the global motion compensation, then the motion vector of the translational motion model is determined for each pixel of the already-encoded small block, based on the global motion vector (steps S1-S5). Next, the representative motion vector is calculated as the predicted vector, based on the motion vector of each pixel of the already-encoded small block (step S6).
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: October 6, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Atsushi Shimizu, Hirohisa Jozawa, Kazuto Kamikura, Hiroshi Watanabe, Atsushi Sagata, Seishi Takamura
  • Patent number: 9124289
    Abstract: An automatic producing method for a predicted value generation procedure that predicts a value of an encoding target pixel by using a previously-decoded pixel. A parent population is generated by randomly producing predicted value generation procedures each of which is indicated by a tree structure, and a plurality of predicted value generation procedures are selected as parents from the parent population. One or more predicted value generation procedures are generated as children based on a predetermined tree structure developing method which subjects the selected predicted value generation procedures to a development where an existing predicted value generation function can be an end node of a tree.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: September 1, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Seishi Takamura, Masaaki Matsumura, Yoshiyuki Yashima
  • Publication number: 20150245021
    Abstract: Setting a reference pixel signal from a decoded pixel signal in intra-prediction in which a prediction signal is generated in the same frame, acquiring prediction mode identification information that identifies an intra-prediction mode, generating a prediction signal based on the reference pixel signal and the prediction mode identification information, making a determination regarding correction of the prediction signal using a reference pixel having a shorter distance from a pixel that is a prediction target in the intra-prediction mode identified by the prediction mode identification information, and correcting the generated prediction signal according to a result of the determination are included in order to provide an image encoding method and an image decoding method capable of improving subjective image quality and coding efficiency using a closer decoded pixel in an intra-prediction process.
    Type: Application
    Filed: September 26, 2013
    Publication date: August 27, 2015
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shohei Matsuo, Masaaki Matsumura, Hiroshi Fujii, Seishi Takamura, Atsushi Shimizu
  • Patent number: 9008173
    Abstract: A method for encoding an image using an intraframe prediction is provided which includes selecting a gradient of a pixel value that is indicated by an image signal to be predicted among a plurality of gradient candidates, generating a predicted signal by applying a gradient in accordance with the distance from a prediction reference pixel based on the gradient, intraframe-encoding the image signal to be predicted based on the predicted signal, and encoding information indicating the size of the selected gradient. Alternatively, the method includes estimating the gradient of a pixel value that is indicated by an image signal to be predicted based on an image signal which has already been encoded, generating a predicted signal by applying a gradient in accordance with the distance from a prediction reference pixel based on the gradient, and intraframe-encoding the image signal to be predicted based on the predicted signal.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: April 14, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shohei Matsuo, Seishi Takamura, Kazuto Kamikura, Yoshiyuki Yashima
  • Publication number: 20140247865
    Abstract: A generated bit amount of filter coefficients of an adaptive interpolation filter is reduced.
    Type: Application
    Filed: October 18, 2012
    Publication date: September 4, 2014
    Inventors: Shohei Matsuo, Yukihiro Bandoh, Takeshi Ito, Seishi Takamura, Atsushi Shimizu, Hirohisa Jozawa
  • Publication number: 20140233646
    Abstract: An object is to reduce an intra-prediction error and improve coding efficiency by introducing an adaptive reference pixel generating process in accordance with coding conditions into intra-prediction. In picture encoding or picture decoding for generating a prediction signal using spatial inter-pixel prediction and encoding or decoding a picture using a prediction residual signal which is a difference between the prediction signal and an original signal, a tap length of an interpolation filter necessary for generating a reference pixel of intra-prediction is set based on one or both of a size of a block which is a processing unit of coding, transform, or prediction and a quantization parameter of the block for the reference pixel, a filtering process which generates the reference pixel is performed using the interpolation filter corresponding to the set tap length, and an intra-prediction signal corresponding to a designated intra-prediction mode is generated using the generated reference pixel.
    Type: Application
    Filed: November 1, 2012
    Publication date: August 21, 2014
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shohei Matsuo, Seishi Takamura, Atsushi Shimizu, Hirohisa Jozawa
  • Publication number: 20140133546
    Abstract: A video encoding device includes means used to estimate a lower limit of a bit amount/distortion cost function when an adaptive interpolation filter (AIF) is used based on a generated bit amount and an encoding distortion amount when a region-based adaptive interpolation filter (RBAIF) is used upon selecting an optimum IF based on a bit amount/distortion cost function among a fixed interpolation filter (IF), the AIF, and the RBAIF, and means used to select an optimum IF based on a comparison of bit amount/distortion cost functions of the fixed IF and the RBAIF when the lower limit is a value greater than the bit amount/distortion cost function for the fixed IF, and selecting an optimum IF based on a comparison of bit amount/distortion functions of the fixed IF, the AIF, and the RBAIF only when the lower limit is less than or equal to the bit amount/distortion cost function for the fixed IF.
    Type: Application
    Filed: June 12, 2012
    Publication date: May 15, 2014
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yukihiro Bandoh, Shohei Matsuo, Seishi Takamura, Hirohisa Jozawa
  • Publication number: 20140119453
    Abstract: A video encoding device performs motion-compensated inter-frame prediction corresponding to fractional pixel precision using a region-based adaptive interpolation filter (RBAIF) in which a frame is divided into regions and an IF coefficient is adaptively set for each division region, and includes means which constructs a linear simultaneous equation for obtaining an IF coefficient for a division region prescribed by a division position when an optimum division position is selected from among candidates for a prepared division position, and means which obtains the IF coefficient by solving the linear simultaneous equation, wherein the equation generation means diverts a redundant arithmetic processing result in an arithmetic operation of calculating the IF coefficient in a different division region and newly calculates only non-redundant difference information using the arithmetic operation.
    Type: Application
    Filed: June 12, 2012
    Publication date: May 1, 2014
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yukihiro Bandoh, Shohei Matsuo, Seishi Takamura, Hirohisa Jozawa
  • Publication number: 20140112391
    Abstract: The prediction error energy in inter-frame prediction with motion compensation is reduced and the coding efficiency is improved.
    Type: Application
    Filed: June 22, 2012
    Publication date: April 24, 2014
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shohei Matsuo, Yukihiro Bandoh, Seishi Takamura, Hirohisa Jozawa