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    IMAGE DATA COMPRESSION
    4.
    发明公开
    IMAGE DATA COMPRESSION 审中-公开

    公开(公告)号：EP4383707A1

    公开(公告)日：2024-06-12

    申请号：EP23214433.7

    申请日：2023-12-05

    Applicant: Imagination Technologies Limited

    Inventor： Martinelli, Ilaria ,  Fenney, Simon ,  Marks, Kellie ,  Higginbottom, Paul

    IPC: H04N19/115 ,  H04N19/176 ,  H04N19/186

    CPC classification number: H04N19/176 ,  H04N19/115 ,  H04N19/186

    Abstract: A method and a compression unit are provided for compressing a block of image data, wherein the block of image data comprises a plurality of image element values, each image element value comprising a plurality of data values relating to a respective plurality of channels, wherein the plurality of channels comprises a reference channel and one or more non-reference channels. For each of the one or more non-reference channels: (i) a number of bits for a non-channel decorrelating mode, nnon-decorrelated, is determined for losslessly representing a difference between a maximum and a minimum of the data values of the non-reference channel for the block; (ii) decorrelated data values are determined for the non-reference channel by finding, for each image element value in the block, a difference between the data value of the non-reference channel and the data value of the reference channel; (iii) a number of bits for a channel decorrelating mode, ndecorrelated, is determined for losslessly representing a difference between a maximum and a minimum of the decorrelated data values of the non-reference channel for the block; (iv) the determined number of bits for the non-channel decorrelating mode, nnon-decorrelated, is compared with the determined number of bits for the channel decorrelating mode, ndecorrelated; and (v) either the channel decorrelating mode or the non-channel decorrelating mode is selected in dependence on a result of the comparison, wherein if the channel decorrelating mode is selected then the decorrelated data values for the non-reference channel for the block are used in place of the data values of the non-reference channel for the block for determining compressed channel data for the non-reference channel. Compressed channel data is determined for each of the channels for the block. Compressed data is formed comprising: an indication of the selected mode for each of the one or more non-reference channels, and the determined compressed channel data for each of the channels.

    SYSTEM AND METHOD FOR FOVEATED COMPRESSION OF IMAGE FRAMES IN A SYSTEM ON A CHIP
    7.
    发明公开
    SYSTEM AND METHOD FOR FOVEATED COMPRESSION OF IMAGE FRAMES IN A SYSTEM ON A CHIP 审中-公开

    公开(公告)号：EP4242856A3

    公开(公告)日：2023-11-01

    申请号：EP23184011.7

    申请日：2018-09-07

    Applicant: QUALCOMM Incorporated

    Inventor： Varia, Meghal ,  Gadelrab, Serag ,  Holland, Wesley James ,  Cheung, Joseph ,  Backer, Dam ,  Longo, Tom

    IPC: G06F12/02 ,  H04N19/00 ,  H04N19/119 ,  H04N19/115 ,  H04N19/17 ,  H04N19/167 ,  H04N19/174

    Abstract: A method for intelligent data compression in a portable computing device ("PCD") is provided, the method comprising: determining a fixation point within an image frame by a fixation point sensor, wherein the fixation point sensor is configured to determine an area of user focus within a given image frame; sectoring the image frame into two or more sectors, wherein the two or more sectors comprises a fixation sector that includes the fixation point and one or more foveated sectors, each foveated sector does not include the fixation point, and each sector comprises a plurality of tiles; compressing the image frame such that the fixation sector is compressed according to a compression algorithm having a low compression factor and the one or more foveated sectors are compressed according to a compression algorithm having a high compression factor, wherein each respective tile within a particular foveated sector is subject to a different compression factor that is based on a distance between the fixation sector and the respective tile, each compression factor of a respective tile within a foveated sector having a magnitude that is assigned corresponding to the distance between the fixation sector and a respective tile; and storing the compressed image frame.

    IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD
    8.
    发明公开
    IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD 审中-公开

    公开(公告)号：EP4199518A1

    公开(公告)日：2023-06-21

    申请号：EP23153439.7

    申请日：2011-10-14

    Applicant: Sony Group Corporation

    Inventor： SATO, Kazushi

    IPC: H04N19/176 ,  H04N19/126 ,  H04N19/124 ,  H04N19/172 ,  H04N19/122 ,  H04N19/129 ,  H04N19/115

    Abstract: Provided is an image processing device including a selection section configured to select, from a plurality of transform units with different sizes, a transform unit used for inverse orthogonal transformation of image data to be decoded, a generation section configured to generate, from a first quantization matrix corresponding to a transform unit for a first size, a second quantization matrix corresponding to a transform unit for a second size from a first quantization matrix corresponding to a transform unit for a first size, and an inverse quantization section configured to inversely quantize transform coefficient data for the image data using the second quantization matrix generated by the generation section when the selection section selects the transform unit for the second size.

    IMAGE COMPRESSION METHOD AND APPARATUS
    10.
    发明公开
    IMAGE COMPRESSION METHOD AND APPARATUS 审中-公开

    公开(公告)号：EP4087239A1

    公开(公告)日：2022-11-09

    申请号：EP20910964.4

    申请日：2020-11-20

    Applicant: Wuhan TCL Corporate Research Co., Ltd.

    Inventor： XIAO, Yunlei ,  LIU, Yangxing

    IPC: H04N19/115 ,  H04N19/124 ,  H04N19/146 ,  H04N19/196 ,  H04N19/42 ,  H04N19/44 ,  H04N19/91 ,  G06N3/04 ,  G06N3/08

    Abstract: The present disclosure is applicable to the technical field of image processing. Provided are an image compression method and apparatus. The method includes: obtaining a target image and a target code rate corresponding to the target image; determining a first code rate parameter corresponding to the target code rate; and inputting the target image and the first code rate parameter into an image compression model, that has been trained, for processing to obtain a compressed image with the target code rate, wherein the image compression model is obtained by training based on multiple code rate parameters including the first code rate parameter.

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