Patents by Inventor Davood SAFFAR

Davood SAFFAR 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).

  • Method and apparatus for non-separable transform selection in an encoder and decoder
    Patent number: 12126835
    Abstract: A method, decoder apparatus, and computer programs are provided. A bit stream having a video block encoded with a multiple transform selection (MTS) index is received. The MTS index is parsed to determine a value of it. Responsive to the MTS index value being a predetermined value (or one of a predetermined set of indices), a LFNST index is parsed from the bit stream to determine a value of it, the value providing an indication whether a LFNST transform set is to be used in decoding the video block. Responsive to the MTS index value not being the predetermined value (or one of the set of indices), the value of the LFNST index is set to a default value indicating no LFNST transform is to be used in the decoding. The video block is decoded based on the values of the MTS index and the LFNST index.
    Type: Grant
    Filed: June 15, 2020
    Date of Patent: October 22, 2024
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Christopher Hollmann, Davood Saffar, Per Wennersten, Jacob Ström
  • ALLOWING A MATRIX BASED INTRA PREDICTION BLOCK TO HAVE MULTIPLE TRANSFORM BLOCKS
    Publication number: 20240340454
    Abstract: A method, decoder, and apparatus are provided. Responsive to a current block being a MIP predicted block, it is determined whether it has one or multiple transform blocks. A MIP weight matrix to be used to decode the current block is determined based on a MIP prediction mode. Responsive to the MIP predicted block having one transform block, the MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream. Responsive to the MIP predicted block having multiple transform blocks: deriving a first MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream and remaining MIP predicted blocks are derived based further on decoded elements in at least one decoded transform block of the current block. The MIP predicted block(s) are output for subsequent processing.
    Type: Application
    Filed: March 8, 2024
    Publication date: October 10, 2024
    Inventors: Zhi ZHANG, Kenneth ANDERSSON, Davood SAFFAR, Rickard SJÖBERG, Jacob STRÖM, Ruoyang YU
  • Film grain process
    Patent number: 12069315
    Abstract: A decoder can obtain a film grain model syntax element from a parameter set in a coded data representation. The decoder can determine a film grain model value by decoding the film grain model syntax element. The decoder can decode a current picture from the coded data representation. The decoder can generate an output picture by applying generated film grain to the current picture. The decoder can output the output picture.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: August 20, 2024
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Rickard Sjöberg, Mitra Damghanian, Martin Pettersson, Davood Saffar
  • METHOD AND APPARATUS FOR SELECTING TRANSFORM SELECTION IN AN ENCODER AND DECODER
    Publication number: 20240275969
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding of video blocks.
    Type: Application
    Filed: April 18, 2024
    Publication date: August 15, 2024
    Inventors: Christopher HOLLMANN, Davood SAFFAR, Jacob STRÖM, Per WENNERSTEN
  • Method and apparatus for selecting transform selection in an encoder and decoder
    Patent number: 11991359
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding of video blocks.
    Type: Grant
    Filed: December 8, 2022
    Date of Patent: May 21, 2024
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Christopher Hollmann, Davood Saffar, Jacob Ström, Per Wennersten
  • Allowing a matrix based intra prediction block to have multiple transform blocks
    Patent number: 11943478
    Abstract: A method, decoder, and apparatus are provided. Responsive to a current block being a MIP predicted block, it is determined whether it has one or multiple transform blocks. A MIP weight matrix to be used to decode the current block is determined based on a MIP prediction mode. Responsive to the MIP predicted block having one transform block, the MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream. Responsive to the MIP predicted block having multiple transform blocks: deriving a first MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream and remaining MIP predicted blocks are derived based further on decoded elements in at least one decoded transform block of the current block. The MIP predicted block(s) are output for subsequent processing.
    Type: Grant
    Filed: September 17, 2020
    Date of Patent: March 26, 2024
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Zhi Zhang, Kenneth Andersson, Davood Saffar, Rickard Sjöberg, Jacob Ström, Ruoyang Yu
  • OUTPUT PROCESS DISABLE INDICATOR
    Publication number: 20230362412
    Abstract: A decoder can receive a bitstream. The bitstream can include at least one output process syntax element for configuring an output process. The decoder can determine that the output process is disabled. The decoder can decode a current picture from the bitstream. The decoder can, responsive to determining that the output process is disabled, output the current picture as an output picture.
    Type: Application
    Filed: December 11, 2020
    Publication date: November 9, 2023
    Inventors: Rickard SJÖBERG, Mitra DAMGHANIAN, Martin PETTERSSON, Davood SAFFAR
  • METHOD AND APPARATUS FOR SELECTING TRANSFORM SELECTION IN AN ENCODER AND DECODER
    Publication number: 20230109113
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding of video blocks.
    Type: Application
    Filed: December 8, 2022
    Publication date: April 6, 2023
    Inventors: Christopher HOLLMANN, Davood SAFFAR, Jacob STRÖM, Per WENNERSTEN
  • FILM GRAIN PROCESS
    Publication number: 20230016432
    Abstract: A decoder can obtain a film grain model syntax element from a parameter set in a coded data representation. The decoder can determine a film grain model value by decoding the film grain model syntax element. The decoder can decode a current picture from the coded data representation. The decoder can generate an output picture by applying generated film grain to the current picture. The decoder can output the output picture.
    Type: Application
    Filed: December 11, 2020
    Publication date: January 19, 2023
    Inventors: Rickard SJÖBERG, Mitra DAMGHANIAN, Martin PETTERSSON, Davood SAFFAR
  • Method and apparatus for selecting transform selection in an encoder and decoder
    Patent number: 11558613
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding of video blocks.
    Type: Grant
    Filed: June 28, 2021
    Date of Patent: January 17, 2023
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Christopher Hollmann, Davood Saffar, Jacob Ström, Per Wennersten
  • ALLOWING A MATRIX BASED INTRA PREDICTION BLOCK TO HAVE MULTIPLE TRANSFORM BLOCKS
    Publication number: 20220377378
    Abstract: A method, decoder, and apparatus are provided. Responsive to a current block being a MIP predicted block, it is determined whether it has one or multiple transform blocks. A MIP weight matrix to be used to decode the current block is determined based on a MIP prediction mode. Responsive to the MIP predicted block having one transform block, the MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream. Responsive to the MIP predicted block having multiple transform blocks: deriving a first MIP predicted block is derived based on the MIP weight matrix and previously decoded elements in the bitstream and remaining MIP predicted blocks are derived based further on decoded elements in at least one decoded transform block of the current block. The MIP predicted block(s) are output for subsequent processing.
    Type: Application
    Filed: September 17, 2020
    Publication date: November 24, 2022
    Inventors: Zhi ZHANG, Kenneth ANDERSSON, Davood SAFFAR, Rickard SJÖBERG, Jacob STRÖM, Ruoyang YU
  • METHOD AND APPARATUS FOR NON-SEPARABLE TRANSFORM SELECTION IN AN ENCODER AND DECODER
    Publication number: 20220337877
    Abstract: A method, decoder apparatus, and computer programs are provided. A bit stream having a video block encoded with a multiple transform selection (MTS) index is received. The MTS index is parsed to determine a value of it. Responsive to the MTS index value being a predetermined value (or one of a predetermined set of indices), a LFNST index is parsed from the bit stream to determine a value of it, the value providing an indication whether a LFNST transform set is to be used in decoding the video block. Responsive to the MTS index value not being the predetermined value (or one of the set of indices), the value of the LFNST index is set to a default value indicating no LFNST transform is to be used in the decoding. The video block is decoded based on the values of the MTS index and the LFNST index.
    Type: Application
    Filed: June 15, 2020
    Publication date: October 20, 2022
    Inventors: Christopher HOLLMANN, Davood SAFFAR, Per WENNERSTEN, Jacob STRÖM
  • MATRIX MULTIPLICATION PROCESS FOR MATRIX BASED INTRA PREDICTION (MIP)
    Publication number: 20220182632
    Abstract: A MIP method (700) for predicting samples of a current block. The method includes storing (s702) a set of MIP weight matrices. The method also includes determining (s704) the width, W, and the height, H, of the current block. The method further includes setting (s706) a mipSizeId variable to 1 as a result of: i) determining that W=4 storing a set of MIP weight matrices and H=16 or ii) determining that W=16 and H=4. The method further includes storing (s708) a value, predModeIntra, that specifies a MIP prediction mode for the current block. The method further includes determining (s710), based on predModeIntra and the value of the mipSizeId variable, a modeId value. And the method further includes selecting (s712), from the set of MIP weight matrices, a MIP weight matrix to be used for the current block, wherein the selection is based on modeId and the value of the mipSizeId variable.
    Type: Application
    Filed: July 22, 2020
    Publication date: June 9, 2022
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Zhi ZHANG, Ruoyang YU, Rickard SJÖBERG, Kenneth ANDERSSON, Jacob STRÖM, Davood SAFFAR
  • METHOD AND APPARATUS FOR SELECTING TRANSFORM SELECTION IN AN ENCODER AND DECODER
    Publication number: 20210329243
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding of video blocks.
    Type: Application
    Filed: June 28, 2021
    Publication date: October 21, 2021
    Inventors: Christopher HOLLMANN, Davood SAFFAR, Jacob STRÖM, Per WENNERSTEN
  • Method and apparatus for selecting transform selection in an encoder and decoder
    Patent number: 11082692
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding.
    Type: Grant
    Filed: November 28, 2019
    Date of Patent: August 3, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Christopher Hollmann, Davood Saffar, Jacob Ström, Per Wennersten
  • METHOD AND APPARATUS FOR SELECTING TRANSFORM SELECTION IN AN ENCODER AND DECODER
    Publication number: 20210136376
    Abstract: There are provided mechanisms for methods and apparatuses for transform selection in encoding and decoding.
    Type: Application
    Filed: November 28, 2019
    Publication date: May 6, 2021
    Inventors: Christopher HOLLMANN, Davood SAFFAR, Jacob STRÖM, Per WENNERSTEN