Patents by Inventor Christopher Segall

Christopher Segall 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).

  • Decoding a picture based on a reference picture set on an electronic device
    Patent number: 10129555
    Abstract: A method for decoding a picture on an electronic device is described. The method includes obtaining a bitstream. The method also includes obtaining a current picture. The method further includes obtaining a relative reference picture set (RPS) parameter. The method additionally includes initializing an index value. Furthermore, the method includes processing another RPS parameter based on the index value. The method also includes decoding the current picture.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: November 13, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jie Zhao, Christopher A. Segall, Sachin G. Deshpande
  • Decoding a picture based on a reference picture set on an electronic device
    Patent number: 10116953
    Abstract: A method for decoding a picture on an electronic device is described. The method includes obtaining a bitstream. The method also includes obtaining a current picture. The method further includes obtaining a relative reference picture set (RPS) parameter. The method additionally includes initializing an index value. Furthermore, the method includes processing another RPS parameter based on the index value. The method also includes decoding the current picture.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: October 30, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jie Zhao, Christopher A. Segall, Sachin G. Deshpande
  • System for nested entropy encoding
    Patent number: 10104391
    Abstract: Methods and systems for improving coding efficiency of video. In one aspect of the disclosure, efficiency may be improved by trimming candidate motion vectors used for spatial and/or temporal prediction. In another aspect of the disclosure, efficiency may be improved by choosing selective combinations of syntax elements from video data.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: October 16, 2018
    Assignee: Dolby International AB
    Inventors: Yeping Su, Christopher A. Segall
  • Nested entropy encoding
    Patent number: 10104376
    Abstract: Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: October 16, 2018
    Assignee: Dolby International AB
    Inventors: Yeping Su, Christopher A. Segall
  • Nested entropy encoding
    Patent number: 10057581
    Abstract: Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: August 21, 2018
    Assignee: Dolby International AB
    Inventors: Yeping Su, Christopher A. Segall
  • VIDEO DECODER WITH REDUCED DYNAMIC RANGE TRANSFORM WITH INVERSE TRANSFORM SHIFTING MEMORY
    Publication number: 20180192056
    Abstract: A method for decoding video includes receiving quantized coefficients representative of a block of video representative of a plurality of pixels. The quantized coefficients are dequantized based upon a function of a remainder. The dequantized coefficients are inverse transformed to determine a decoded residue.
    Type: Application
    Filed: March 2, 2018
    Publication date: July 5, 2018
    Inventors: Louis J. Kerofsky, Kiran Misra, Christopher A. Segall
  • Nested Entropy Encoding
    Publication number: 20180192055
    Abstract: Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.
    Type: Application
    Filed: February 27, 2018
    Publication date: July 5, 2018
    Inventors: Yeping Su, Christopher A. Segall
  • METHODS, DEVICES AND SYSTEMS FOR PARALLEL VIDEO ENCODING AND DECODING
    Publication number: 20180176606
    Abstract: A method for decoding a video bitstream is disclosed. The method comprises: entropy decoding a first portion of a video bitstream, wherein first portion of video bitstream is associated with a video frame, thereby producing a first portion of decoded data; entropy decoding a second portion of video bitstream, wherein second portion of video bitstream is associated with video frame, thereby producing a second portion of decoded data, wherein entropy decoding second portion of video bitstream is independent of entropy decoding first portion of video bitstream; and reconstructing a first portion of video frame associated with video bitstream using first portion of decoded data and second portion of decoded data.
    Type: Application
    Filed: February 15, 2018
    Publication date: June 21, 2018
    Inventors: Jie Zhao, Christopher A. Segall, Louis J. Kerofsky
  • Tracking a reference picture on an electronic device
    Patent number: 9992507
    Abstract: Methods for decoding a video bitstream. One of the methods includes receiving a respective buffer description for each of one or more decoded reference pictures from the video bitstream; wherein the respective buffer descriptions include a poc cycle parameter for one or more long term reference pictures in the one or more decoded reference pictures, and wherein the poc cycle parameter is used to calculate a picture order count (POC) for the decoded long term reference pictures; identifying one or more decoded reference pictures for a current picture from a decoded picture buffer, based on the POC for the decoded long term reference pictures; decoding the current picture using inter-frame prediction based on the identified one or more decoded reference pictures; and buffering the decoded picture in the decoded picture buffer.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: June 5, 2018
    Assignee: Dolby International AB
    Inventors: Kiran Misra, Sachin G. Deshpande, Christopher A. Segall
  • VIDEO DECODER WITH ENHANCED CABAC DECODING
    Publication number: 20180131940
    Abstract: A decoder receives a bitstream containing quantized coefficients representative of blocks of video representative of a plurality of pixels and decodes the bitstream using context adaptive binary arithmetic coding. The context adaptive binary arithmetic coding decodes the current syntax element using the first mode if the current syntax element is intra-coded and selecting between a first set of probable modes and a second set of probable modes, where the first set of probable modes are more likely than the second set of probable modes. The context adaptive binary arithmetic coding decodes the current syntax element using the second mode if the current syntax element is intra-coded and if selecting among one of the second set of probable modes.
    Type: Application
    Filed: January 3, 2018
    Publication date: May 10, 2018
    Inventors: Kiran MISRA, Christopher A. SEGALL
  • Video decoder with reduced dynamic range transform with inverse transform shifting memory
    Patent number: 9955165
    Abstract: A method for decoding video includes receiving quantized coefficients representative of a block of video representative of a plurality of pixels. The quantized coefficients are dequantized based upon a function of a remainder. The dequantized coefficients are inverse transformed to determine a decoded residue.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: April 24, 2018
    Assignee: Dolby International AB
    Inventors: Louis J. Kerofsky, Kiran Misra, Christopher A. Segall
  • Nested entropy encoding
    Patent number: 9930339
    Abstract: Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: March 27, 2018
    Assignee: Dolby International AB
    Inventors: Yeping Su, Christopher A. Segall
  • Methods, devices and systems for parallel video encoding and decoding
    Patent number: 9930369
    Abstract: A method for decoding a video bitstream is disclosed. The method comprises: entropy decoding a first portion of a video bitstream, wherein first portion of video bitstream is associated with a video frame, thereby producing a first portion of decoded data; entropy decoding a second portion of video bitstream, wherein second portion of video bitstream is associated with video frame, thereby producing a second portion of decoded data, wherein entropy decoding second portion of video bitstream is independent of entropy decoding first portion of video bitstream; and reconstructing a first portion of video frame associated with video bitstream using first portion of decoded data and second portion of decoded data.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: March 27, 2018
    Assignee: Dolby International AB
    Inventors: Jie Zhao, Christopher A. Segall, Louis J. Kerofsky
  • Video decoder with enhanced CABAC decoding
    Patent number: 9930337
    Abstract: A decoder receives a bitstream containing quantized coefficients representative of blocks of video representative of a plurality of pixels and decodes the bitstream using context adaptive binary arithmetic coding. The context adaptive binary arithmetic coding decodes the current syntax element using the first mode if the current syntax element is intra-coded and selecting between a first set of probable modes and a second set of probable modes, where the first set of probable modes are more likely than the second set of probable modes. The context adaptive binary arithmetic coding decodes the current syntax element using the second mode if the current syntax element is intra-coded and if selecting among one of the second set of probable modes.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: March 27, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Kiran Misra, Christopher A. Segall
  • Video decoding methods and video encoding methods
    Patent number: 9883181
    Abstract: A system for decoding a video bitstream includes receiving a reference picture set associated with a frame including a set of reference picture identifiers. The reference picture set identifies one or more reference pictures to be used for inter-prediction of the frame based upon its associated least significant bits of a picture order count based upon the reference picture identifiers. The one or more reference pictures is a second or greater previous frame to the frame having the matching reference picture identifier.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: January 30, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Sachin G. Deshpande, Christopher A. Segall
  • COMPUTATIONALLY EFFICIENT MOTION COMPENSATED FRAME RATE CONVERSION SYSTEM
    Publication number: 20180020229
    Abstract: A system for frame rate conversion of a video.
    Type: Application
    Filed: July 14, 2016
    Publication date: January 18, 2018
    Inventors: Xu CHEN, Petrus J.L. VAN BEEK, Christopher A. SEGALL
  • Video decoder with reduced dynamic range transform with inverse transform clipping
    Patent number: 9854242
    Abstract: A method for decoding video includes receiving quantized coefficients representative of a block of video representative of a plurality of pixels. The quantized coefficients are dequantized based upon a function of a remainder. The dequantized coefficients are inverse transformed to determine a decoded residue.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: December 26, 2017
    Assignee: Dolby International AB
    Inventors: Louis J. Kerofsky, Kiran Misra, Christopher A. Segall
  • GOLOMB-RICE/EG Coding Technique for CABAC in HEVC
    Publication number: 20170332102
    Abstract: A system utilizing a high throughput coding mode for CABAC in HEVC is described. The system may include an electronic device configured to obtain a block of data to be encoded using an arithmetic based encoder; to generate a sequence of syntax elements using the obtained block; to compare an Absolute-3 value of the sequence or a parameter associated with the Absolute-3 value to a preset value; and to convert the Absolute-3 value to a codeword using a first code or a second code that is different than the first code, according to a result of the comparison.
    Type: Application
    Filed: July 28, 2017
    Publication date: November 16, 2017
    Inventors: Seung-Hwan Kim, Louis J. Kerofsky, Christopher A. Segall
  • CONTENT INITIALIZATION FOR ENHANCEMENT LAYER CODING
    Publication number: 20170324969
    Abstract: A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.
    Type: Application
    Filed: May 23, 2017
    Publication date: November 9, 2017
    Inventors: Seung-Hwan KIM, Christopher A. SEGALL, Jie ZHAO
  • METHOD FOR DERIVING A MOTION VECTOR
    Publication number: 20170318312
    Abstract: A method for decoding video includes creating a first list of motion vectors from at least one neighboring block in a current frame of the video and creating a second list of motion vectors from at least one previous block in a temporally earlier frame of the video. A third list of motion vectors is created based upon the first list and the second list. Based upon receiving a motion vector competition control parameter selecting one of the motion vectors from the third list, wherein the second list of motion vectors is further based upon a flooring function.
    Type: Application
    Filed: July 14, 2017
    Publication date: November 2, 2017
    Inventor: Christopher A. Segall