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1.发明公开METHODS AND APPARATUSES FOR ENCODING AN HDR IMAGES, AND METHODS AND APPARATUSES FOR USE OF SUCH ENCODED IMAGES 有权方法和设备对于使用此编码图像进行编码的HDR图像和方法及装置
公开(公告)号：EP3149944A1
公开(公告)日：2017-04-05
申请号：EP15710536.2
申请日：2015-03-19
CPC分类号： H04N19/98 , G06T5/009 , G06T9/00 , G06T2207/10024 , G06T2207/20208 , G09G3/2003 , G09G5/10 , G09G2320/0271 , G09G2320/0276 , G09G2320/0673 , G09G2340/02 , G09G2340/06 , H04N5/20 , H04N7/0117 , H04N19/186 , H04N19/30 , H04N19/44 , H04N19/46
摘要： To enable a good HDR image or video coding technology, being able to yield high dynamic range images as well as low dynamic range images, we invented a method of encoding a high dynamic range image (M_HDR), comprising the steps of: converting the high dynamic range image to an image of lower luminance dynamic range (LDR_o) by applying a) scaling the high dynamic range image to a predetermined scale of the luma axis such as [0,1], b) applying a sensitivity tone mapping which changes the brightnesses of pixel colors falling within at least a subrange comprising the darker colors in the high dynamic range image, c) applying a gamma function, and d) applying an arbitrary monotonically increasing function mapping the lumas resulting from performing the steps b and c to output lumas of the lower dynamic range image (LDR_o); and outputting in an image signal (S_im) a codification of the pixel colors of the lower luminance dynamic range image (LDR_o), and outputting in the image signal (S_im) values encoding the functional behavior of the above color conversions as metadata, or values for the inverse functions, which metadata allows to reconstruct a high dynamic range image (Rec_HDR) from the lower luminance dynamic range image (LDR_o).
摘要翻译： 为了使良好的HDR图像或视频编码技术，能够产生高动态范围图像以及低动态范围的图像，我们发明了编码包含的步骤的高动态范围图像（M_HDR）的方法：将所述高 如[0.1]，b）将灵敏度色调映射，其改变：通过施加）缩放所述高动态范围图像的亮度轴的预定的比例动态范围图像的较低亮度动态范围的图像（LDR_o） 落入至少一个子范围内的像素颜色亮度的高动态范围图像中包含的颜色较深，c）施加伽玛函数，以及d）将在任意的单调递增函数映射所述lumas从执行所述步骤b和c，以输出得到的 所述较低动态范围图像的lumas（LDR_o）; 并输出的图像信号（S_IM）下部的亮度动态范围的图像（LDR_o），并且输出的像素颜色的图像信号中起始的一个编纂开始（S_IM）值编码上述颜色转换的元数据，或值的功能行为 对于反函数，它允许元数据，以从下的亮度动态范围的图像（LDR_o）重构高动态范围图像（Rec_HDR）。
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公开(公告)号：EP2702765A1
公开(公告)日：2014-03-05
申请号：EP12720630.8
申请日：2012-04-17
CPC分类号： G06T9/004 , G06T5/009 , G06T2207/10024 , H04N1/646 , H04N19/184 , H04N19/186 , H04N19/187 , H04N19/30 , H04N19/46 , H04N19/597 , H04N19/61 , H04N19/70
摘要： An apparatus generates an image coding signal comprising for each image a first pixelised picture and a second pixelised picture having a luminance component and a chroma component. The apparatus comprises a first picture processor (203, 211) which includes image encoding data for an encoded first image in the first pixelised picture. A second picture processor (205, 207, 209, 211) includes dynamic range extension data in the second pixelised picture. The dynamic range extension data may be dynamic range extension data included in a chroma component of the second pixelised picture for generating an increased dynamic range image on the basis of the encoded first image. The compensation data may e.g. be compensation data for correcting another LDR-to-HDR transform, e.g. a prefixed global gamma transformation. The dynamic range extension data may be included in a luminance component and comprise data representing a dynamic range extension transform for generating an increased dynamic range image from the encoded first image.
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公开(公告)号：EP3231174B1
公开(公告)日：2020-08-26
申请号：EP15762531.0
申请日：2015-09-02
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公开(公告)号：EP3381179A1
公开(公告)日：2018-10-03
申请号：EP16797820.4
申请日：2016-11-11
CPC分类号： G06T5/007 , G06T5/50 , G06T2207/10016 , G06T2207/10024 , G06T2207/20208 , G06T2207/20221 , G09G5/02 , G09G5/026 , G09G5/10 , G09G2340/06 , G09G2340/125 , H04N1/6027 , H04N5/20 , H04N5/265 , H04N5/445 , H04N5/45 , H04N5/57 , H04N9/68 , H04N9/77
摘要： 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).
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5.发明公开
公开(公告)号：EP3324629A1
公开(公告)日：2018-05-23
申请号：EP17204594.0
申请日：2015-03-19
CPC分类号： H04N19/98 , G06T5/009 , G06T9/00 , G06T2207/10024 , G06T2207/20208 , G09G3/2003 , G09G5/10 , G09G2320/0271 , G09G2320/0276 , G09G2320/0673 , G09G2340/02 , G09G2340/06 , H04N5/20 , H04N7/0117 , H04N19/186 , H04N19/30 , H04N19/44 , H04N19/46
摘要： To enable a good HDR image or video coding technology, being able to yield high dynamic range images as well as low dynamic range images, we invented a method of encoding a high dynamic range image (M_HDR), comprising the steps of:
- converting the high dynamic range image to an image of lower luminance dynamic range (LDR_o) by applying a) scaling the high dynamic range image to a predetermined scale of the luma axis such as [0,1], b) applying a sensitivity tone mapping which changes the brightnesses of pixel colors falling within at least a subrange comprising the darker colors in the high dynamic range image, c) applying a gamma function, and d) applying an arbitrary monotonically increasing function mapping the lumas resulting from performing the steps b and c to output lumas of the lower dynamic range image (LDR_o); and
- outputting in an image signal (S_im) a codification of the pixel colors of the lower luminance dynamic range image (LDR_o), and
- outputting in the image signal (S_im) values encoding the functional behavior of the above color conversions as metadata, or values for the inverse functions, which metadata allows to reconstruct a high dynamic range image (Rec_HDR) from the lower luminance dynamic range image (LDR_o).-
公开(公告)号：EP3231174A1
公开(公告)日：2017-10-18
申请号：EP15762531.0
申请日：2015-09-02
摘要： Color transformation apparatus (201) for calculating resultant colors (R2, G2, B2) of pixels of an output image 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_H) which is different from the display peak brightness, said color transformation apparatus comprising: a color transformation determination unit (102) arranged to determine a color transformation (g) from color processing specification data (MET) comprising at least one tone mapping function (CC) for at least a range of pixel luminances received via a metadata input (116), which color transformation specifies the calculation of at least some pixel colors of an image having corresponding to its maximum luma code a second image peak brightness (PB_L), which is different from the display peak brightness (PB_D) and the first image peak brightness (PB_H), 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) arranged to determine a resultant common multiplicative factor (gt), said scaling factor determination unit comprising:—a capability metric determination unit arranged to determine a metric for locating positions of display peak brightnesses between the first image peak brightness (PB_H), and the second image peak brightness (PB_L) and outside that range; and—a resultant multiplier determination unit arranged to determine from the display peak brightness (PB_D), the metric, and the color transformation the resultant common multiplicative factor (gt), and wherein the color transformation apparatus (201) further comprises a scaling multiplier (114) arranged to multiply a linear RGB color representation of the input colors with the resultant common multiplicative factor (gt).
摘要翻译： 用于计算具有从输入的像素的输入颜色（R，G，B）开始的显示峰值亮度（PB_D）的显示的输出图像的像素的结果颜色（R2，G2，B2）的颜色变换设备 具有与显示峰值亮度不同的第一图像峰值亮度（PB_H）对应的具有最大亮度代码的图像（Im_in），所述颜色变换设备包括：颜色变换确定单元（102），被配置为确定颜色变换（g ）从包括经由元数据输入（116）接收的至少一个像素亮度范围的至少一个色调映射函数（CC）的颜色处理指定数据（MET）中确定，所述颜色变换指定计算至少一些像素颜色 图像具有对应于其最大亮度代码的与显示峰值亮度（PB_D）和第一图像峰值亮度（PB_H）不同的第二图像峰值亮度（PB_L），并且由此对 第二图像峰值亮度的第一图像峰值亮度或大于2或小于1/2; 所述缩放因子确定单元包括： - 能力度量确定单元，被配置为确定用于定位所述第一图像峰值之间的显示峰值亮度的位置的度量 亮度（PB_H）和第二图像峰值亮度（PB_L）以及该范围之外; 以及 - 结果乘数确定单元，被配置为根据显示峰值亮度（PB_D），度量和颜色变换确定所得到的公共乘法因子（gt），并且其中颜色变换设备（201）还包括缩放乘法器（ 114），其被布置为将输入颜色的线性RGB颜色表示与所得到的公共乘法因子（gt）相乘。
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公开(公告)号：EP4366312A1
公开(公告)日：2024-05-08
申请号：EP22205268.0
申请日：2022-11-03
IPC分类号： H04N19/98 , H04N23/741 , H04N5/57
CPC分类号： H04N23/741
摘要： For meeting the future demand of high quality yet economically feasible high dynamic range video program creation, the inventor proposes a method of in a video camera (201) setting a video camera capturing mode of specifying output pixel luminances in one or more graded versions of output video sequences of images, comprising:
- an operator of the video camera moving to at least two positions (Pos1, Pos2) in a scene which have a different illumination compared to each other, and capturing at least one high dynamic range image (o_ImHDR) for each of those at least two positions of the scene;
- a color composition director analyzing for each of the at least two positions the captured at least one high dynamic range image to determine a region of maximum brightness, and determining at least one of an iris setting, a shutter time, and an analog gain setting for the camera;
- capturing for each position of one of the at least two positions (Pos1, Pos2) a respective master capturing (RW) using the at least one of an iris setting, a shutter time setting, and an analog gain setting for the camera, and keeping iris, shutter time and analog gain settings constant for later capturing in at least the corresponding position;
- determining at least a respective first graded image (ODR) for the respective master capturing, which consists of mapping by a respective luminance allocation function (FL_M) of digital numbers of the master capturing to nit values of the first graded image (ODR), by the color composition director establishing a shape of such luminance allocation function; and
- storing the respective luminance allocation functions (Fs1, Fs2) for the at least two positions, or parameters uniquely defining these functions, in respective memory locations (221, 222) of the camera.-
公开(公告)号：EP3394850B1
公开(公告)日：2020-05-13
申请号：EP16822989.6
申请日：2016-12-21
发明人： MERTENS, Mark Jozef Willem , NIJLAND, Rutger , VAN MOURIK, Johannes Gerardus Rijk , TICHELAAR, Johannes Yzebrand
IPC分类号： G09G5/10
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公开(公告)号：EP3251082A1
公开(公告)日：2017-12-06
申请号：EP15822932.8
申请日：2015-12-22
发明人： VAN DER VLEUTEN, Renatus Josephus , STESSEN, Jeroen Hubert Christoffel Jacobus , MERTENS, Mark Jozef Willem
CPC分类号： G06T5/009 , G06T2207/20092 , G06T2207/20096 , G06T2207/20208 , H04N5/235 , H04N5/2355 , H04N9/69 , H04N19/182 , H04N19/98
摘要： 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.
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公开(公告)号：EP2689392A1
公开(公告)日：2014-01-29
申请号：EP12712749.6
申请日：2012-03-19
发明人： MUIJS, Remco Theodorus Johannes , MERTENS, Mark Jozef Willem , BRULS, Wilhelmus Hendrikus Alfonsus , DAMKAT, Chris , HAMMER, Martin , KWISTHOUT, Cornelis Wilhelmus
IPC分类号： G06T5/50
CPC分类号： G09G5/10 , G06T5/007 , G06T5/50 , G06T2207/20208 , G09G2320/0613 , G09G2320/0626
摘要： The method of analyzing a difference of at least two gradings of an image on the basis of: obtaining a first graded picture (LDR) with a first luminance dynamic range; obtaining data encoding a grading of a second graded picture (HDR) with a second luminance dynamic range, different from the first luminance dynamic range; determining a grading difference data structure (DATGRAD) on the basis of at least the data encoding the grading of the second graded picture (HDR), allows more intelligently adaptive encoding of the imaged scenes, and consequently also better use of those pictures, such as higher quality rendering under various rendering scenarios.
摘要翻译： 基于以下步骤分析图像的至少两个渐变的差异的方法：获得具有第一亮度动态范围的第一渐变图片（LDR） 获得编码具有与所述第一亮度动态范围不同的第二亮度动态范围的第二分级图片（HDR）的分级的数据; 至少基于对第二分级图片（HDR）的分级进行编码的数据来确定分级差异数据结构（DATGRAD），允许对所成像的场景进行更智能的自适应编码，并且因此也更好地使用那些图片，诸如 在各种渲染场景下渲染质量更高。
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