Patents by Inventor Jacob Ström

Jacob Ström 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: 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
  • Publication number: 20210321094
    Abstract: Methods and apparatuses for video processing. In one aspect, filtering is applied after applying a set of offset values to one or more coefficients. The application of an offset value may be based on a determination as to whether the coefficient meets a threshold value.
    Type: Application
    Filed: July 2, 2019
    Publication date: October 14, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per WENNERSTEN, Jacob STRÖM, Jack ENHORN, Du LIU
  • Patent number: 11132429
    Abstract: A computing device for authenticating a user is provided. The computing device is operative to display a first text to the user, acquire a representation of the user subvocalizing a part of the first text, derive a user phrasing signature from the acquired representation, and authenticate the user in response to determining that the user phrasing signature and a reference phrasing signature fulfill a similarity condition. Optionally, the computing device may be further operative to determine if the user is authorized to read the first text. Further optionally, the computing device may be operative to reveal obfuscated parts of the first text in response to determining that the user is authorized to read the first text, or to discontinue displaying the first text, or to obfuscate at least part of the first text, in response to determining that the user is not authorized to read the first text.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: September 28, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Matthew John Lawrenson, Lars Andersson, Till Burkert, Harm Stefan Cronie, Jacob Ström, Jan Jasper Van Den Berg
  • Publication number: 20210297680
    Abstract: A refined reconstruction block of a first color component in a picture is determined by at least one of clipping and bilateral filtering a sum of a prediction block of the first color component and a residual of the first color component. A residual block of a second color component is predicted from the refined 5 construction block of the first color component. Applying clipping and/or filtering to the first color component prior to using it in cross-component prediction of the second color component improves and refines predictions or residuals of another color component.
    Type: Application
    Filed: October 6, 2017
    Publication date: September 23, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Ying WANG, Kenneth ANDERSSON, Jacob STRÖM, Per WENNERSTEN
  • Patent number: 11122263
    Abstract: A pixel value of a pixel in a picture of a video sequence is modified by a weighted combination of the pixel value and at least one spatially neighboring pixel value in a filtering. The filtering depends on a pixel distance between the pixel and a neighboring pixel and on a pixel value difference between the pixel and a neighboring pixel value of the neighboring pixel. The filtering is controlled by a spatial parameter and a range parameter. The spatial parameter depends on at least one of a width and a height of a transform block, and on at least one of a prediction type of a block of pixels in the picture, a picture type of the picture, and a slice type of a slice in the picture.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: September 14, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Per Wennersten, Kenneth Andersson, Jack Enhorn, Jacob Ström, Ying Wang
  • Publication number: 20210274171
    Abstract: According to a first aspect, a method is provided. The method includes obtaining an M×N array of pixel values an image; determining a weight selection value for position x,y in the M×N array; and using the weight selection value to obtain a weight value for use in a filter for filtering the image. Determining the weight selection value for position x,y (omegax,y) includes: a) retrieving a previously determined weight selection value for position x,y?1 (omegax,y?1); b) retrieving a previously determined alpha value (a) for position x,y?1; c) calculating a delta value (d); and d) calculating omegax,y=omegax,y?1?a+d. Calculating d includes: i) retrieving a first previously determined value (omega_row); i) retrieving a second previously determined value (alpha_row); and ii) calculating d=omega_row?alpha_row+abs(Ax+1,y+1?Ax+1,y+2), wherein Ax+1,y+1 is the value stored in position x+1,y+1 of the array and Ax+1,y+2 is the value stored in position x+1,y+2 of the array.
    Type: Application
    Filed: July 9, 2019
    Publication date: September 2, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jacob STRÖM, Per WENNERSTEN, Jack ENHORN, Du LIU
  • Publication number: 20210274186
    Abstract: A method for encoding or decoding an image of a video sequence is provided. The method comprises obtaining a set of sample values associated with the image. The method comprises determining a relative location of the current sample value with respect to a virtual boundary. The virtual boundary is defined with respect to a block boundary between the first block of sample values and a second block of sample values. The virtual boundary is parallel with the block boundary and separated from the block boundary by at least one row or column of sample values included in the first block of sample values. The method comprises a filter strength value based on the determined relative location of the current sample value with respect to the virtual boundary. The method comprises filtering the current sample value based on the selected filter strength value.
    Type: Application
    Filed: May 18, 2021
    Publication date: September 2, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Kenneth ANDERSSON, Jacob STRÖM, Zhi ZHANG, Jack ENHORN
  • 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
  • Patent number: 11070818
    Abstract: A method of decoding a block of video samples from a video bitstream is provided in which the method includes decoding a DQPRP value, deriving a PQP value for a block having a non-zero residual, decoding a DDQP value for the block, deriving a SDQP value for the block from the DDQP value and the DQPRP value, deriving a block QP value for the block from the SDQP value and the PQP value, decoding at least one non-zero coefficient of the block, deriving values of a residual block for the block by first scaling the at least one non-zero coefficient using the QP value and thereafter applying an inverse transform, deriving values of a prediction block spatial or temporal prediction, and deriving decoded sample values for the block by adding the values of the residual block and the values of the prediction block.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: July 20, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Rickard Sjöberg, Kenneth Andersson, Jacob Ström, Per Wennersten, Zhi Zhang
  • Patent number: 11064210
    Abstract: A processing for a first pixel in a picture comprises obtaining a lower limit of a first color component of the first pixel in a first color space based on a distance between a color of the first pixel and a first distorted version of the color in a second color space. An upper limit of the first color component in the first color 5 space is obtained based on a distance between the color and a second distorted version of the color in the second color space. A filtered value is obtained of the first color component and which is equal to or larger than the lower limit and equal to or lower than the upper limit. The processing results in filtered values that are cheaper to encode but that are visibly undistinguishable from the original colors of the pixels.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: July 13, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Jacob Ström, Kenneth Andersson, Per Hermansson, Jonatan Samuelsson, Per Wennersten
  • Patent number: 11048148
    Abstract: An imaging device comprising a first camera with a controllable focus is provided. The imaging device is operative to detect that a user of the imaging device intends to capture an image of an object using the first camera, control the focus of the first camera to assume a target focal length, and capture the image. The target focal length is derived based on a measured accommodation of an eye lens of the user. Further, a contact lens comprising an eye-accommodation detector and a communications module is provided. The contact lens is operative to measure an accommodation of an eye lens to which the contact lens is attached, and transmit, to an imaging device comprising a first camera with a controllable focus, information pertaining to the measured accommodation of the eye lens and/or a focal length of the eye lens corresponding to the measured accommodation.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: June 29, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Matthew John Lawrenson, Jacob Ström, Lars Andersson, Till Burkert
  • Publication number: 20210195215
    Abstract: A method of decoding a block of video samples from a video bitstream is provided in which the method includes decoding a DQPRP value, deriving a PQP value for a block having a non-zero residual, decoding a DDQP value for the block, deriving a SDQP value for the block from the DDQP value and the DQPRP value, deriving a block QP value for the block from the SDQP value and the PQP value, decoding at least one non-zero coefficient of the block, deriving values of a residual block for the block by first scaling the at least one non-zero coefficient using the QP value and thereafter applying an inverse transform, deriving values of a prediction block spatial or temporal prediction, and deriving decoded sample values for the block by adding the values of the residual block and the values of the prediction block.
    Type: Application
    Filed: June 4, 2018
    Publication date: June 24, 2021
    Inventors: Rickard SJÖBERG, Kenneth ANDERSSON, Jacob STRÖM, Per WENNERSTEN, Zhi ZHANG
  • Patent number: 11032575
    Abstract: The present embodiments introduce a new type of random access point in video bitstreams that can be used for random access operations but can be represented in encoded form at a lower bit-cost as compared to IRAP pictures. The random access point is a dependent random access point (DRAP) picture that is encoded and decoded using an IRAP picture as sole reference picture for the DRAP picture. The DRAP picture is encoded as a trailing picture that may be used for reference and constitutes a random access point in a video bitstream.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: June 8, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Martin Pettersson, Jonatan Samuelsson, Rickard Sjöberg, Jacob Ström, Ruoyang Yu
  • Patent number: 11025927
    Abstract: A pixel pre-processing comprises subsampling a linear color in a first color space to obtain a subsampled linear color in the first color space. A first transfer function is applied to the subsampled linear color the first color space to obtain a subsampled non-linear color in the first color space. A first color transform is applied to the subsampled non-linear color in the first color space to obtain a subsampled first non-linear chroma component value and/or a subsampled second non-linear chroma component value in a second color space. A non-linear luma component value in the second color space is derived for the pixel, which together with the subsampled non-linear chroma component values represent a color the pixel. The pre-processing reduces chroma artifacts that may otherwise occur when chroma subsampling is performed following application of the first transfer function and the first color transform.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: June 1, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Jacob Ström, Kenneth Andersson, Martin Pettersson, Jonatan Samuelsson
  • Publication number: 20210136401
    Abstract: A method for decoding a current block in a current picture of a video bitstream includes decoding, from the video bitstream, a first motion vector for the current block relative to a first reference block of a first reference picture having a first picture order count, and decoding, from the video bitstream, a second motion vector for the current block relative to a second reference block of a second reference picture having a second picture order count. A similarity metric is generated based on a comparison of the first motion vector and the second motion vector. The method further includes determining whether to refine the first motion vector based on the similarity metric, generating a first refined motion vector from the first motion vector, and performing motion compensation to derive a first reference block from the first reference picture using the first refined motion vector.
    Type: Application
    Filed: December 9, 2019
    Publication date: May 6, 2021
    Inventors: Du LIU, Rickard SJÖBERG, Jacob STRÖM, Ruoyang YU
  • 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
  • Publication number: 20210112271
    Abstract: The present embodiments introduce a new type of random access point in video bitstreams that can be used for random access operations but can be represented in encoded form at a lower bit-cost as compared to IRAP pictures. The random access point is a dependent random access point (DRAP) picture that is encoded and decoded using an IRAP picture and/or a previous, according to a decoding order, DRAP picture as sole reference picture(s) for the DRAP picture. The DRAP picture is encoded as a trailing picture that may be used for reference and constitutes a random access point in a video bitstream.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 15, 2021
    Inventors: Martin PETTERSSON, Jonatan SAMUELSSON, Rickard SJÖBERG, Jacob STRÖM, Ruoyang YU
  • Publication number: 20210092508
    Abstract: A method and an apparatus for enabling adaptive audio signal alteration are described. When an input audio signal is received, a determination of whether the user of an audio device hears the input audio signal is performed based upon brain activity of the user. A determination of whether the user is distracted by the audio signal is performed based upon sensor measurements indicating a physical state of the user. In response to determining that the user hears the input audio signal and that the input audio signal causes the user to be distracted, a determination of configuration parameter(s) is performed. An alteration of audio signal(s) is caused based upon the configuration parameter(s) to obtain modified version(s) of the audio signal(s) that are intended to address the distraction caused by the input audio signal, and output audio signals are output, where the output audio signals include the modified versions.
    Type: Application
    Filed: December 4, 2020
    Publication date: March 25, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Matthew John LAWRENSON, Jan Jasper VAN DEN BERG, Jacob STRÖM, Lars ANDERSSON
  • Patent number: 10944967
    Abstract: Embodiments of the disclosure provide methods, apparatus and computer programs for adaptive loop filtering in an encoder and in a decoder. One method, performed in an encoder, comprises: determining filter parameters for a plurality of filters to be used in encoding a frame or slice; determining respective activity values for each of a plurality of blocks in the frame or slice, wherein each block comprises a plurality of pixels; determining respective quantization parameters for each of the plurality of blocks; selecting, for each of the plurality of blocks, a filter from the plurality of determined filters based on the respective activity value and the respective quantization parameter; and applying the filter parameters for the respective selected filters to the plurality of blocks.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: March 9, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Per Wennersten, Alfonso De La Rocha, Jacob Ström
  • Publication number: 20210067770
    Abstract: An encoded video sequence including a plurality of images may be decoded. First and second adjacent blocks of an image of an encoded video sequence may be provided. A line of pixels including pixels of the first and second blocks may be defined extending across a boundary between the first and second blocks. A first reference value may be calculated based on a first pixel of the pixels from the first block. A second reference value may be calculated based on a second pixel of the pixels from the second block. Filtered pixel values for each pixel of the line of pixels between the first pixel and the second pixel may be calculated using interpolation based on the first and/or second reference values. Filtered blocks may be generated using the filtered pixel values, and a decoded video sequence may be generated based on the filtered blocks.
    Type: Application
    Filed: December 14, 2018
    Publication date: March 4, 2021
    Inventors: Kenneth ANDERSSON, Jack ENHORN, Rickard SJÖBERG, Jacob STRÖM, Per WENNERSTEN