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    Optimized decoded high dynamic range image saturation
    2.
    发明授权
    Optimized decoded high dynamic range image saturation 有权

    公开(公告)号：US11521537B2

    公开(公告)日：2022-12-06

    申请号：US17190459

    申请日：2021-03-03

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Johannes Yzebrand Tichelaar ,  Mark Jozef Willem Mertens ,  Johannes Gerardus Rijk Van Mourik

    IPC: G09G3/00 ,  G09G3/20

    Abstract: To enable better color and in particular color saturation control for HDR image handling systems which need to do luminance dynamic range conversion, e.g. from a SDR image to an image optimized for rendering on a display of higher display peak brightness and dynamic range, the inventors invented an apparatus (400) for processing a color saturation (C′bL, C′rL) of an input color (Y′L, C′bL, C′rL) of an input image (Im_RLDR) to yield an output color (Y′M, Cb′M, Cr′M) of an output image (Im3000nit) corresponding to the input image, which output image is a re-grading of the input image characterized by the fact that its pixel colors have a different normalized luminance position (Y2) compared to the normalized luminance positions of the input colors (Y1), the normalized luminances being defined as the luminance of a pixel divided by the respective maximal codeable luminance of the image's luminance representation, whereby the ratio of the maximum codeable luminance of the input image and the maximum codeable luminance of the output image is at least 4 or larger, or ¼th or smaller, the apparatus comprising: a receiver (206) arranged to receive a luminance mapping function (F_L_s2h) defining a mapping between the luminance of the input color (Y′L) and a reference luminance (L′_HDR), and an initial saturation processing function (F_sat) defining saturation boost values (b) for different values of the luminance of the input color (Y′L); a display tuning unit (1009) arranged to calculate a display tuned luminance mapping function (F_L_da) based on the luminance mapping function (F_L_s2h) and at least one of a display peak brightness (PB_D) and a minimum discernable black (MB_D); a luminance processor (401) arranged to apply the display tuned luminance mapping function (F_L_da) to determine an output luminance (Y′M) from the input luminance (Y′L) of the input color; and a saturation processing unit (410, 411), arranged to map the input color saturation (C′bL, C′rL) to the color saturation (Cb′M, Cr′M) of the output color on the basis of a saturation processing strategy which specifies saturation multipliers for the normalized luminance values (Y_norm); characterized in that the apparatus further comprises a saturation factor determination unit (402) arranged to calculate a final saturation processing strategy (b; Bcorr) based on the initial saturation processing strategy (F_sat) and based on a secondary luminance value (Y′_H) which is derivable from the output luminance (Y′M) by applying a luminance mapping function (F_M2H) based on the luminance mapping function (F_L_s2h), and wherein the saturation processing unit is arranged to calculate the color saturation (Cb′M, Cr′M) of the output color by applying the final saturation processing strategy (b; Bcorr).

    Methods and apparatuses for encoding HDR images
    3.
    发明授权
    Methods and apparatuses for encoding HDR images 有权

    公开(公告)号：US10362337B2

    公开(公告)日：2019-07-23

    申请号：US15327401

    申请日：2015-07-21

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Mark Jozef Willem Mertens

    IPC: H04N19/98 ,  H04N19/16 ,  H04N19/186 ,  H04N19/70 ,  H04N19/30

    Abstract: To enable future video transmission of a large range of HDR videos, and render them on displays of variable dynamic range or peak brightness capability, we describe an encoder (301) for encoding an input high dynamic range video set of images (Im_5000), having pixel colors with luminances lower than a first maximum luminance (L_max_M), into an encoded high dynamic range video (Im_2000), being a high dynamic range image, i.e. with a maximum luminance for displaying on a display with a corresponding peak brightness of at least 900 nit, being characterized in that the encoding definition allows encoding pixel color luminances up to a second maximum luminance (L_max_C), which is equal to or less than 50% of the first maximum luminance, the encoder comprising: a re-grading unit (320) arranged to allow a content creator to specify at least a tone mapping function (F_2Tu, 601) for color mapping the encoded high dynamic range video (Im_2000) of lower second maximum luminance (L_max_C) to a HDR video reconstruction (Im_5000*) of the high dynamic range video (Im_5000); and a formatter, arranged to write into a video signal (S_im) the encoded high dynamic range video (Im_2000) and as metadata the at least a tone mapping function (F_2Tu, 601), and related encoder and decoder embodiments and methods, and transmission technical components and technologies.

    Simple but versatile dynamic range coding
    4.
    发明授权
    Simple but versatile dynamic range coding 有权

    公开(公告)号：US10217198B2

    公开(公告)日：2019-02-26

    申请号：US15538808

    申请日：2015-12-22

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Renatus Josephus Van Der Vleuten ,  Jeroen Hubert Christoffel Jacobus Stessen ,  Mark Jozef Willem Mertens

    IPC: H04N5/235 ,  G06T5/00 ,  H04N9/69 ,  H04N19/182 ,  H04N19/98

    Abstract: For obtaining an good yet easy to use luminance dynamic range conversion, we describe an image color processing apparatus (200) arranged to transform an input color (R,G,B) of a pixel of an input image (Im_in) having a first luminance dynamic range into an output color (Rs, Gs, Bs) of a pixel of an output image (Im_res) having a second luminance dynamic range, which first and second dynamic ranges differ in extent by at least a multiplicative factor 2, comprising: a maximum determining unit (101) arranged to calculate a maximum (M) of color components of the input color, the color components at least comprising a red, green and blue component;—a uniformization unit (201) arranged to apply a function (FP) to the maximum (M) as input, which function has a logarithmic shape and was predetermined to be of a fixed shape enabling to transform a linear input to a more perceptually uniform output variable (u); a function application unit (203) arranged to receive a functional shape of a function, which was specified previously by a human color grader, and apply the function to the uniform output variable (u), yielding a transformed uniform value (TU); a linearization unit (204) arranged to transform the transformed uniform value (TU) to a linear domain value (LU); a multiplication factor determination unit (205) arranged to determine a multiplication factor (a) being equal to the linear domain value (LU) divided by the maximum (M); and a multiplier (104) arranged to multiply at least three linear color components (R,G,B) by the multiplication factor (a), yielding the output color.

    Methods and apparatuses for processing or defining luminance/color regimes
    5.
    发明授权
    Methods and apparatuses for processing or defining luminance/color regimes 有权

    公开(公告)号：US10134444B2

    公开(公告)日：2018-11-20

    申请号：US15134521

    申请日：2016-04-21

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Mark Jozef Willem Mertens

    IPC: H04N9/73 ,  G11B27/11 ,  H04N1/00 ,  H04N5/85 ,  H04N9/793 ,  H04N19/17 ,  H04N19/182 ,  H04N19/186 ,  H04N19/46

    Abstract: To allow a better coordination between an image creation artist such as a movie director of photography and the final viewer, via a receiving-side display and its built-in image processing, a method of adding image defining information to an input image signal (I) comprises showing the input image (I) to a human operator; receiving via a user interface (303, 308) descriptive data (D) from the human operator, the descriptive data (D) including at least luminance value information on the one hand, and a regime descriptor (rd) on the other hand; and encoding into an output description data signal (DDO), relatable to an output image signal (O) based upon the input image signal (I), of the descriptive data (D) in a technical format standardized to be intended for use by a receiving-side display to control its image processing for changing the color properties of its rendered images.

    Making HDR viewing a content owner agreed process
    7.
    发明授权
    Making HDR viewing a content owner agreed process 有权

    公开(公告)号：US09641894B2

    公开(公告)日：2017-05-02

    申请号：US14427019

    申请日：2013-09-08

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Mark Jozef Willem Mertens

    IPC: H04N7/173 ,  H04N21/4627 ,  H04N21/4402 ,  H04N21/2662 ,  H04N21/254 ,  G06F21/10 ,  H04N5/913

    CPC classification number: H04N21/4627 ,  G06F21/10 ,  H04N5/913 ,  H04N21/2541 ,  H04N21/2662 ,  H04N21/440218

    Abstract: To allowed for increased security for selling HDR movies (or at least HDR experiences) even when some of the movie data gets pirated, an image transformation apparatus (201) is arranged to derive a e.g. a high dynamic range image (HDR_PRED) from a low dynamic range image (LDR_CONT) or any dynamic range image (e.g. a display driving image) from any dynamic range input image, wherein the derivation comprises tone mapping of lumas of pixels in the low dynamic range image into lumas of pixels of the high dynamic range image by applying at least one predefined mapping algorithm (gam), the image transformation apparatus comprising: -an input (204) to a data delivery system (205) comprising the low dynamic range image; -a data-secured input (206) to the at least one predefined mapping algorithm (gam) data; and -a control unit (202) arranged to manage access to the predefined mapping algorithm data under control of an owner of artistic content in the low dynamic range image, which allows for better control of the authorized regularity of the content when it is to be rendered, which is possible because of our special HDR image encoding strategy.

    Handling multiple HDR image sources
    8.
    发明授权
    Handling multiple HDR image sources 有权

    公开(公告)号：US10902567B2

    公开(公告)日：2021-01-26

    申请号：US15777022

    申请日：2016-11-11

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Mark Jozef Willem Mertens

    IPC: G06K9/00 ,  G06T5/00 ,  H04N5/265 ,  G06T5/50 ,  G09G5/02 ,  H04N1/60 ,  H04N5/445 ,  H04N5/57 ,  G09G5/10 ,  H04N5/45 ,  H04N5/20 ,  H04N9/68 ,  H04N9/77

    Abstract: To allow the needed versatile image or video combination now that HDR videos of considerably different luminance characteristics are appearing, the apparatus (301) for combining two images or two videos of images (Im_HDR, Im_LDR), one of them being a high dynamic range image or video, the apparatus comprising: —a dynamic range establishing unit (302) arranged to establish a combination luminance dynamic range (CombRng), being characterized by at least a maximum luminance (LMC) which is determined based on at least one of: a maximum luminance of at least one of the two images or the two videos of images, and a peak brightness of a display for rendering the two images or the two videos of images, the dynamic range establishing unit further comprising a luminance anchor determining unit (303), arranged to determine an anchor luminance (anc) in the combination luminance dynamic range (CombRng), —a color transformation unit (310), arranged to perform at least a luminance transformation on at least one of the two images or videos, wherein the color transformation unit (310) comprises a source anchor luminance reading unit (311) arranged to read at least one source anchor luminance (L_SA1) from a first source (350) which delivers a first image or video (Im1_LDR) of the two images or videos, and wherein the color transformation unit is arranged to establish a color transformation (FF_1) to be applied to the first image or video, which color transformation is dependent on the value of the source anchor luminance (L_SA1) by having the property that the source anchor luminance (L_SA1) is mapped to an output luminance in a vicinity of the anchor luminance (anc); and —an image combination unit (320) arranged to combine the two images or two videos of images to form at least one output image (Im_o).

    Methods and apparatuses for processing or defining luminance/color regimes
    9.
    发明授权
    Methods and apparatuses for processing or defining luminance/color regimes 有权

    公开(公告)号：US10134443B2

    公开(公告)日：2018-11-20

    申请号：US15134496

    申请日：2016-04-21

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Mark Jozef Willem Mertens

    IPC: H04N19/186 ,  H04N19/182 ,  G11B27/11 ,  H04N1/00 ,  H04N5/85 ,  H04N9/793 ,  H04N19/17 ,  H04N19/46

    Abstract: To allow a better coordination between an image creation artist such as a movie director of photography and the final viewer, via a receiving-side display and its built-in image processing, a method of adding image defining information to an input image signal (I) comprises receiving descriptive data (D) that includes at least luminance value information on the one hand, and a regime descriptor (rd) on the other hand; and encoding into an output description data signal (DDO), relatable to an output image signal (O) based upon an input image signal (I), of the descriptive data (D) in a technical format standardized to be intended for use by a receiving-side display to control its image processing for changing the color properties of its rendered images.

    HDR image encoding and decoding methods and devices
    10.
    发明授权
    HDR image encoding and decoding methods and devices 有权

    公开(公告)号：US10027965B2

    公开(公告)日：2018-07-17

    申请号：US15336002

    申请日：2016-10-27

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Mark Jozef Willem Mertens

    IPC: G06K9/36 ,  H04N19/196 ,  H04N19/182 ,  H04N19/186 ,  H04N19/17

    Abstract: To have a very efficient and in some embodiments also backwards compatible with legacy LDR display systems, apparatuses and methods relating to decoding an image encoding (LDR_CONT) corresponding to a first luminance dynamic range (R_oLDR) into a second luminance dynamic range (R_oHDR) output image (HDR_FIN), in which image encoding (LDR_CONT) are encoded pixels of an original image (HDR_ORIG) of a high dynamic range scene, the method comprising: tone mapping with a predetermined tone mapping strategy (FL2H) at least the lumas of pixels in the image encoding (LDR_CONT) onto lumas of pixels in an intermediate image (HDR_PRED) corresponding to the second luminance dynamic range (R_oHDR); and modifying the lumas of at least some of the pixels of the intermediate image (HDR_PRED) by multiplying them with predetermined multiplication factors, resulting in the output image (HDR_FIN) are taught.

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