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公开(公告)号：US12125183B2
公开(公告)日：2024-10-22
申请号：US17511718
申请日：2021-10-27
CPC分类号： G06T5/92 , G06T7/90 , G06T9/00 , H04N9/643 , H04N9/68 , H04N9/77 , H04N23/88 , G06T2207/10016 , G06T2207/10024 , G06T2207/20092
摘要： To allow a better determination of an image of a different luminance dynamic range (in particular as characterised by a different maximum luminance a.k.a. peak brightness) than an input image, the present application teaches several variants of a luminance processor (501) arranged to calculate an output luminance of a pixel of an output image (Im_LDR; Im3000nit) having a second luminance dynamic range characterized by a second peak brightness (PB_LDR; PB_MDR) from an input luminance of a spatially collocated pixel of an input image (MAST_HDR) having a first luminance dynamic range characterized by a first peak brightness (PB_HDR), characterized in that the luminance processor comprises:
a gain calculation unit (514) arranged to calculate a multiplication factor (gL) being a function of the input luminance and a luminance mapping function (FLM);
a maximum calculation unit (601) arranged to calculate a strength value (V) which is the maximal one of the three red, green and blue color components of the color of the pixel of the input image, wherein those components are either linear red, green and blue color components or a power of those linear red, green and blue color components;
an overflow calculator (602) arranged to calculate an overflow measure (T) indicating how close to the upper gamut boundary the output luminance is;
a gain factor modification unit (603) arranged to determine an alternative gain factor (F1(gL)) in case the overflow measure is larger than a threshold (G), and arranged to keep the original gain factor otherwise, and arranged to output one of those as a final gain factor (gF); and
a multiplier (530) to multiply the input color (R′G′B′_nrm) by the final gain factor (gF) to obtain an output color (R′G′B′_HDR) having the output luminance.-
公开(公告)号：US11521537B2
公开(公告)日：2022-12-06
申请号：US17190459
申请日：2021-03-03
摘要： 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).
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公开(公告)号：US11887285B2
公开(公告)日：2024-01-30
申请号：US18102792
申请日：2023-01-30
发明人： Johannes Yzebrand Tichelaar , Johannes Gerardus Rijk Van Mourik , Jeroen Hubert Christoffel Jacobus Stessen , Roeland Focco Everhard Goris , Mark Jozef Willem Mertens , Patrick Luc Els Vandewalle , Rutger Nijland
IPC分类号： G06T5/00 , H04N19/186 , H04N19/60
CPC分类号： G06T5/007 , H04N19/186 , H04N19/60 , G06T2207/10016 , G06T2207/10024
摘要： To enable a high quality HDR video communication, which can work by sending corresponding LDR images potentially via established LDR video communication technologies, which works well in practical situations, applicant has invented a HDR video decoder (600, 1100) arranged to calculate a HDR image (Im_RHDR) based on applying to a received 100 nit standard dynamic range image (Im_RLDR) a set of luminance transformation functions, the functions comprising at least a coarse luminance mapping (FC), which is applied by a dynamic range optimizer (603), and a mapping of the darkest value (0) of an intermediate luma (Y′HPS), being output of the dynamic range optimizer, to a received black offset value (Bk_off) by a range stretcher (604), the video decoder comprising a gain limiter (611, 1105) arranged to apply an alternate luminance transformation function to calculate a subset (502) of the darkest luminances of the HDR image, from corresponding darkest lumas (Y′_in) of the standard dynamic range image.
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公开(公告)号：US11170478B2
公开(公告)日：2021-11-09
申请号：US16770133
申请日：2018-12-06
摘要： To allow a better determination of an image of a different luminance dynamic range (in particular as characterised by a different maximum luminance a.k.a. peak brightness) than an input image, the present application teaches several variants of a luminance processor (501) arranged to calculate an output luminance of a pixel of an output image (Im_LDR; Im3000 nit) having a second luminance dynamic range characterized by a second peak brightness (PB_LDR; PB_MDR) from an input luminance of a spatially collocated pixel of an input image (MAST_HDR) having a first luminance dynamic range characterized by a first peak brightness (PB_HDR), characterized in that the luminance processor comprises: a gain calculation unit (514) arranged to calculate a multiplication factor (gL) being a function of the input luminance and a luminance mapping function (FLM); a maximum calculation unit (601) arranged to calculate a strength value (V) which is the maximal one of the three red, green and blue color components of the color of the pixel of the input image, wherein those components are either linear red, green and blue color components or a power of those linear red, green and blue color components; an overflow calculator (602) arranged to calculate an overflow measure (T) indicating how close to the upper gamut boundary the output luminance is; a gain factor modification unit (603) arranged to determine an alternative gain factor (F1(gL)) in case the overflow measure is larger than a threshold (G), and arranged to keep the original gain factor otherwise, and arranged to output one of those as a final gain factor (gF); and a multiplier (530) to multiply the input color (R′G′B′_nrm) by the final gain factor (gF) to obtain an output color (R′G′B′_HDR) having the output luminance.
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公开(公告)号：US10863201B2
公开(公告)日：2020-12-08
申请号：US16060274
申请日：2016-12-21
发明人： Mark Jozef Willem Mertens , Rutger Nijland , Johannes Gerardus Rijk Van Mourik , Johannes Yzebrand Tichelaar
IPC分类号： H04N19/625 , G09G5/02 , G09G5/10 , H04N19/102 , H04N19/186
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).
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公开(公告)号：US11593922B2
公开(公告)日：2023-02-28
申请号：US17061937
申请日：2020-10-02
发明人： Johannes Yzebrand Tichelaar , Johannes Gerardus Rijk Van Mourik , Jeroen Hubert Christoffel Jacobus Stessen , Roeland Focco Everhard Goris , Mark Jozef Willem Mertens , Patrick Luc Els Vandewalle , Rutger Nijland
IPC分类号： G06T5/00 , H04N19/186 , H04N19/60
摘要： To enable a high quality HDR video communication, which can work by sending corresponding LDR images potentially via established LDR video communication technologies, which works well in practical situations, applicant has invented a HDR video decoder (600, 1100) arranged to calculate a HDR image (Im_RHDR) based on applying to a received 100 nit standard dynamic range image (Im_RLDR) a set of luminance transformation functions, the functions comprising at least a coarse luminance mapping (FC), which is applied by a dynamic range optimizer (603), and a mapping of the darkest value (0) of an intermediate luma (Y′HPS), being output of the dynamic range optimizer, to a received black offset value (Bk_off) by a range stretcher (604), the video decoder comprising a gain limiter (611, 1105) arranged to apply an alternate luminance transformation function to calculate a subset (502) of the darkest luminances of the HDR image, from corresponding darkest lumas (Y′_in) of the standard dynamic range image.
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公开(公告)号：US11272195B2
公开(公告)日：2022-03-08
申请号：US17266650
申请日：2019-08-22
IPC分类号： H04N19/186 , H04N19/44 , H04N19/98
摘要： At least some applications in the total HDR video chain desire some more sophisticated approach, such as a high dynamic range video encoder (900), arranged to receive via an image input (920) an input high dynamic range image (MsterHDR) which has a first maximum pixel luminance (PB_C_H50), the encoder being arranged to receive via a metadata input (921) a master luma mapping function (FL_50t1), which luma mapping function defines the relationship between normalized lumas of the input high dynamic range image and normalized lumas of a corresponding standard dynamic range image (Im_LDR) having a maximum pixel luminance of preferably 100 nit, characterized in that the encoder further comprises a metadata input (923) to receive a second maximum pixel luminance (PB_CH), and the encoder further being characterized in that it comprises: —a HDR function generation unit (901) arranged to apply a standardized algorithm to transform the master luma mapping function (FL_50t1) into a adapted luma mapping function (F_H2hCI), which relates normalized lumas of the input high dynamic range image to normalized luminances of an intermediate dynamic range image (IDR) which is characterized by having a maximum possible luminance being equal to the second maximum pixel luminance (PB_CH); an IDR image calculation unit (902) arranged to apply the adapted luma mapping function (F_H2hCI) to lumas of pixels of the input high dynamic range image (MsterHDR) to obtain lumas of pixels of the intermediate dynamic range image (IDR); and an IDR mapping function generator (903) arranged to derive on the basis of the master luma mapping function (FL_50t1) and the adapted luma mapping function (F_H2hCI) a channel luma mapping function (F_I2sCI), which defines as output the respective normalized lumas of the standard dynamic range image (Im_LDR) when given as input the respective normalized lumas of the intermediate dynamic range image (IDR); the encoder being further characterized to have as output: the intermediate dynamic range image (IDR), as first metadata the second maximum pixel luminance (PB_CH), as second metadata the channel luma mapping function (F_I2sCI); and as third metadata the first maximum pixel luminance (PB_C_H50).
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公开(公告)号：US10964248B2
公开(公告)日：2021-03-30
申请号：US16609045
申请日：2018-05-03
摘要： 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 luminance processor (401) arranged to apply a 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, the apparatus further comprising a saturation factor determination unit (402) arranged to calculate a final saturation processing strategy (b; Bcorr) based on an 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) which is based on the luminance mapping function (F_L_s2h).
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公开(公告)号：US10803562B2
公开(公告)日：2020-10-13
申请号：US16085087
申请日：2017-03-15
发明人： Johannes Yzebrand Tichelaar , Johannes Gerardus Rijk Van Mourik , Jeroen Hubert Christoffel Jacobus Stessen , Roeland Focco Everhard Goris , Mark Jozef Willem Mertens , Patrick Luc Els Vandewalle , Rutger Nijland
IPC分类号： G06K9/00 , G06T5/00 , H04N19/186 , H04N19/60
摘要： To enable a high quality HDR video communication, which can work by sending corresponding LDR images potentially via established LDR video communication technologies, which works well in practical situations, applicant has invented a HDR video decoder (600, 1100) arranged to calculate a HDR image (Im_RHDR) based on applying to a received 100 nit standard dynamic range image (Im_RLDR) a set of luminance 5 transformation functions, the functions comprising at least a coarse luminance mapping (FC), which is applied by a dynamic range optimizer (603), and a mapping of the darkest value (0) of an intermediate luma (Y′HPS), being output of the dynamic range optimizer, to a received black offset value (Bk_off) by a range stretcher (604), the video decoder comprising a gain limiter (611, 1105) arranged to apply an alternate luminance transformation function to 10 calculate a subset (502) of the darkest luminances of the HDR image, from corresponding darkest lumas (Y′_in) of the standard dynamic range image.
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公开(公告)号：US10289213B2
公开(公告)日：2019-05-14
申请号：US15506282
申请日：2015-09-28
摘要： The invention is directed at a remote control device for controlling one or more user devices, comprising a directional optical sensor for receiving one or more optical signals from the user devices and for detecting an incoming direction of said received optical signals, and a processor. For identification of at least one of said user devices, the processor is arranged for analyzing at least one of said received optical signals for associating thereof with the at least one of said user devices and for keeping track of the at least one of said optical signals upon changing of said incoming direction. The one or more optical signals comprise high and low signal states, wherein each optical signal consists of one or more signal fragments. Each signal fragment comprising a leading or trailing low signal state and a high signal state, wherein a duration of the high signal state determines a signal fragment type of the signal fragment and wherein said duration of the high signal state is longer than a duration of the low signal state. The processor is arranged for performing said associating of said at least one received optical signal with the at least one of said user devices by recognition of the one or more signal fragments and associating each signal fragment with its signal fragment type for obtaining therefrom a signal pattern which is uniquely associable with said at least one of said user devices.
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