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    ILLUMINATING DEVICE, METHOD FOR DETERMINING DISPOSITION OF LIGHT-GUIDING PLATE, AND PRINTING SYSTEM
    2.
    发明公开
    ILLUMINATING DEVICE, METHOD FOR DETERMINING DISPOSITION OF LIGHT-GUIDING PLATE, AND PRINTING SYSTEM 审中-公开

    公开(公告)号：EP4450865A1

    公开(公告)日：2024-10-23

    申请号：EP22907030.5

    申请日：2022-10-26

    申请人： FUJIFILM Corporation

    发明人： NAGASHIMA, Kanji

    IPC分类号： F21S2/00 ,  B41J2/01 ,  G06T1/00 ,  H04N1/04 ,  H04N1/12 ,  F21Y115/10

    摘要： Provided are an illumination device, a light guide plate disposition determination method, and a printing system in which appropriate disposition of a light guide plate is defined depending on a condition of the light guide plate. In an illumination device including a light guide plate (32) using total reflection, in a case in which a total length of the light guide plate in a thickness direction is denoted by W, a refractive index of a periphery of the light guide plate is denoted by n 1 , a refractive index of the light guide plate is denoted by n 2 , and a maximum incidence angle with respect to a first surface corresponding to the number of reflections is denoted by θ imax , the light guide plate is disposed at a position at which a distance from an emission surface (35) to an illumination target area is equal to or shorter than L t , which is calculated by L t = {(1/2) × (n 1 /n 2 ) × W}/tanθ imax .

    MEDIA DATA ENCRYPTION METHOD AND APPARATUS, AND MEDIA DATA PLAYBACK METHOD AND SYSTEM
    4.
    发明公开
    MEDIA DATA ENCRYPTION METHOD AND APPARATUS, AND MEDIA DATA PLAYBACK METHOD AND SYSTEM 审中-公开

    公开(公告)号：EP4446919A1

    公开(公告)日：2024-10-16

    申请号：EP22902848.5

    申请日：2022-07-29

    申请人： Unilumin Group Co., Ltd.

    发明人： QI, Feng ,  YU, Chengzhi

    IPC分类号： G06F21/60 ,  G06F16/22 ,  H04N21/218 ,  H04N21/2347 ,  H04N21/4405 ,  H04N1/32

    摘要： A media data encryption method and apparatus, and a media data playback method and system. The media data encryption method comprises : obtaining media data to be encrypted and a display screen structure parameter of a data playback end; constructing a data arrangement table corresponding to the display screen structure parameter; performing a data rearrangement operation on the data arrangement table to obtain position rearrangement index data representing a mapping relationship between a logic and a physical position of a display pixel; and according to the position rearrangement index data, performing pixel rearrangement encryption on each image frame of the media data to be encrypted to obtain encrypted media data. The media data playback method comprises : a data encryption end encodes and encrypts media data to be encrypted by adopting a media data encryption method to obtain a media data encrypted packet, and sends the media data encrypted packet to the data playback end; a receiving card of the data playback end decrypts the media data encrypted packet to obtain configuration data and media data to be decrypted, and configures a programmable logic circuit according to the configuration data to decrypt and play the media data to be decrypted.