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    AUTOMATIC LUMINANCE ADJUSTMENT FOR HDR VIDEO CODING
    122.
    发明公开
    AUTOMATIC LUMINANCE ADJUSTMENT FOR HDR VIDEO CODING 审中-公开

    公开(公告)号：EP4220539A1

    公开(公告)日：2023-08-02

    申请号：EP22153613.9

    申请日：2022-01-27

    申请人： Koninklijke Philips N.V.

    发明人： VAREKAMP, Christiaan ,  NIJLAND, Rutger

    IPC分类号： G06T5/00 ,  H04N5/235 ,  H04N19/98 ,  H04N19/40

    摘要： To obtain a practical yet versatile and accurate apparatus for luminance re-grading (300) of an input high dynamic range image (IM_HDR) of first luminance dynamic range into a second image (IM DR2) of second luminance dynamic range, the inventors propose the apparatus to comprise:
    - a first neural network processing circuit (301), having as input a set of pixel luminances of the input high dynamic range image (IM_HDR), characterized in that the first neural network processing circuit has at least two sets of outputs, a first output set (S1) comprising at least one parameter (P11) which determines a re-grading function, and a second output set (S2) comprising at least one corresponding parameter (P12) which determines a re-grading function which is determined by the same parametric definition but a different parameter value;
    - a second neural network processing circuit (302), which has as input at least one measurement value (La) from at least one sensor (311), and as output a set of weights corresponding in amount to at least the number of sets of the first neural network processing circuit;
    - a combiner (303), arranged to add a first parameter (P11) of the first output set of the first neural network processing circuit multiplied by a corresponding first weight (wl 1) from the second neural network processing circuit to a corresponding output (P12) for the same re-grading function defining parameter of the second output set of the first neural network processing circuit multiplied by a corresponding second weight (w12) from the second neural network processing circuit, yielding a final parameter (P1_f); and
    - a luma mapping circuit (320) arranged to map input lumas of the input high dynamic range image (IM_HDR) with a luma mapping function (F_L) which is defined by the final parameter (Pl_f) to obtain output lumas of the second image (IM DR2).