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    BRIGHTNESS REGION-BASED APPARATUSES AND METHODS FOR HDR IMAGE ENCODING AND DECODING
    15.
    发明公开
    BRIGHTNESS REGION-BASED APPARATUSES AND METHODS FOR HDR IMAGE ENCODING AND DECODING 审中-公开
    基于明亮区域DEVICE AND METHOD FOR HDR图像编码和解码

    公开(公告)号：EP2880624A2

    公开(公告)日：2015-06-10

    申请号：EP13721100.9

    申请日：2013-03-25

    申请人： Koninklijke Philips N.V.

    发明人： MERTENS, Mark Jozef Willem

    IPC分类号： G06T5/00 ,  H04N1/60 ,  H04N1/64

    CPC分类号： H04N19/625 ,  H04N19/102 ,  H04N19/14 ,  H04N19/17 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/30 ,  H04N19/46

    摘要： The image encoder (549) for encoding an image of a high dynamic range scene, comprising: a pixel texture encoding unit (552), arranged to encode pixels colors of the image with an image representation (Im 1) comprising N-bit code words; an image analysis unit (550) arranged to determine and output a region differentiator grey value (gTS), which is a luma value demarcating below it lumas of all pixels of a first object in at least one block of the image, and above it lumas of all pixels of a second object in the at least one block of the image; and a formatter (554) arranged to co-encode in an output image signal (S(Im_1, MET(gTS)) the image representation (Im 1) and the region differentiator grey value (gTS), makes highly versatile use of images encoding HDR scenes possible, in particular encoding them in image formats compatible with existing MPEG video coding standards.

    MIXING SECONDARY GRAPHICS ELEMENTS IN HDR IMAGES
    16.
    发明公开
    MIXING SECONDARY GRAPHICS ELEMENTS IN HDR IMAGES 审中-公开

    公开(公告)号：EP4283459A1

    公开(公告)日：2023-11-29

    申请号：EP22175149.8

    申请日：2022-05-24

    申请人： Koninklijke Philips N.V.

    发明人： MERTENS, Mark Jozef Willem

    IPC分类号： G06F3/147 ,  G09G5/10 ,  H04N21/435 ,  H04N21/84 ,  H04N21/434 ,  G09G5/02 ,  G09G5/00

    摘要： To get much better predictable graphics insertion, with better coordinating of the pixel luminances respectively their coded lumas of primary and secondary graphics elements inserted at different times in a HDR video, the inventor proposes a method of determining in a circuit for processing digital images second lumas of pixels of a secondary graphics image element (216) to be mixed with at least one high dynamic range input image (206), the method or corresponding apparatus comprising the technical elements of:
    receiving a high dynamic range image signal (S_im) comprising the at least one high dynamic range input image, characterized in that the method comprises:
    - analyzing the high dynamic range image signal to determine a specific range of graphics lumas (R_gra) of the at least one high dynamic range input image, wherein the determining a specific range of graphics lumas comprises determining a lower luma (Y_low) and an upper luma (Y_high);
    - specifying the secondary graphics element with at least a brightest subset of its pixel lumas comprised in the specific range of graphics lumas; and
    - mixing the secondary graphics image element with the high dynamic range input image.

    OPTIMIZING HIGH DYNAMIC RANGE IMAGES FOR PARTICULAR DISPLAYS
    20.
    发明公开
    OPTIMIZING HIGH DYNAMIC RANGE IMAGES FOR PARTICULAR DISPLAYS 审中-公开

    公开(公告)号：EP3394850A1

    公开(公告)日：2018-10-31

    申请号：EP16822989.6

    申请日：2016-12-21

    申请人： Koninklijke Philips N.V.

    发明人： MERTENS, Mark Jozef Willem ,  NIJLAND, Rutger ,  VAN MOURIK, Johannes Gerardus Rijk ,  TICHELAAR, Johannes Yzebrand

    IPC分类号： G09G5/10

    摘要： To enable practical and quick generation of a family of good looking HDR gradings for various displays on which the HDR image may need to be shown, we describe a color transformation apparatus (201) to calculate resultant colors (R2, G2, B2) of pixels of an output image (IM_MDR) for a display with a display peak brightness (PB_D) starting from input colors (R, G, B) of pixels of an input image (Im_in) having a maximum luma code corresponding to a first image peak brightness (PB_IM1) which is different from the display peak brightness, characterized in that the color transformation apparatus comprises: —a color transformation determination unit (102; 2501) arranged to determine a color transformation (TMF; g) as defined in color processing specification data (MET_1) comprising at least one tone mapping function (CC) received via a metadata input (116), which color transformation specifies how the luminances of pixels of the input image are to be converted into luminances for those pixels of a second image (IM_HDR) having corresponding to its maximum luma code a second image peak brightness (PB_IM2), which is different from the display peak brightness (PB_D) and the first image peak brightness (PB_IM1), and whereby the division of the first image peak brightness by the second image peak brightness is either larger than 2 or smaller than ½; —a scaling factor determination unit (200; 2603) arranged to determine a resultant common multiplicative factor (gt; Ls), the unit being arranged to apply determining along a direction (DIR) a position along a metric a position (M_PB_U) which corresponds with the display peak brightness (PB_D) and arranged to determine the resultant common multiplicative factor (gt; Ls) based on the position, and wherein the color transformation apparatus (201) further comprises: —a scaling multiplier (114) arranged to multiply each of the three color components of an RGB color representation of the input colors with the resultant common multiplicative factor (gt).