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    Decoding a block of video samples
    3.
    发明授权
    Decoding a block of video samples 有权

    公开(公告)号：US11070818B2

    公开(公告)日：2021-07-20

    申请号：US16080087

    申请日：2018-06-04

    Applicant: Telefonaktiebolaget LM Ericsson (publ)

    Inventor： Rickard Sjöberg ,  Kenneth Andersson ,  Jacob Ström ,  Per Wennersten ,  Zhi Zhang

    IPC: H04N19/176 ,  H04N19/122 ,  H04N19/159 ,  H04N19/124

    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.

    Guided transcoding
    4.
    发明授权
    Guided transcoding 有权

    公开(公告)号：US10735735B2

    公开(公告)日：2020-08-04

    申请号：US16332744

    申请日：2016-09-15

    Applicant: Telefonaktiebolaget LM Ericsson (publ)

    Inventor： Kenneth Andersson ,  Thomas Rusert ,  Christopher Hollmann ,  Jonatan Samuelsson

    IPC: H04N19/129 ,  H04N19/159 ,  H04N19/176 ,  H04N19/40 ,  H04N19/70

    Abstract: Delta quantized coefficients of a pixel block in a picture in a first representation of a video sequence are encoded based on information derived from estimated quantized coefficients for the pixel block. The delta quantized coefficients represent a difference between actual quantized coefficients of the pixel block derived by encoding at least a portion of the picture in the first representation of the video sequence and the estimated quantized coefficients. The estimated quantized coefficients represent a difference between a reconstructed block of a corresponding picture in a second representation of the video sequence and a prediction block obtained based on intra mode information and/or inter motion information derived by encoding the picture in the first representation of the video sequence.

    Pixel processing and encoding
    10.
    发明授权
    Pixel processing and encoding 有权

    公开(公告)号：US09918095B1

    公开(公告)日：2018-03-13

    申请号：US15503301

    申请日：2016-05-12

    Applicant: Telefonaktiebolaget LM Ericsson (publ)

    Inventor： Jacob Ström ,  Kenneth Andersson ,  Olie Baumann ,  Martin Pettersson ,  Jonatan Samuelsson

    IPC: H04N7/12 ,  H04N19/182 ,  H04N19/186 ,  H04N19/86

    CPC classification number: H04N19/182 ,  H04N19/117 ,  H04N19/186 ,  H04N19/46 ,  H04N19/85 ,  H04N19/86

    Abstract: A method of processing pixels in a picture of a video sequence comprising multiple pictures comprises identifying a pixel to be processed in the picture for which a variation in a linear representation of a color of the pixel that is smaller than a first threshold value results in a variation in a non-linear representation of the color that is larger than a second threshold value. The variation in the linear representation of the color also results in a variation in a luminance and chrominance based representation of the color that is smaller than a third threshold value. The method also comprises processing the identified pixel by modifying a value of at least one color component of the pixel. The method achieves a selective denoising of particular color components in certain situations to reduce the encoding cost yet do not significantly affect the visual quality.

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