公开(公告)号：EP3235236A1

公开(公告)日：2017-10-25

申请号：EP16806189.3

申请日：2016-12-12

申请人： Koninklijke Philips N.V.

发明人： STESSEN, Jeroen, Hubert, Christoffel, Jacobus

IPC分类号： H04N5/202 ,  H04N1/64 ,  H04N9/68 ,  H04N19/46 ,  H04N19/102 ,  H04N19/186 ,  H04N19/44 ,  H04N5/355 ,  H04N19/98

CPC分类号： H04N19/46 ,  G06T5/009 ,  G06T2207/10016 ,  G06T2207/10024 ,  G06T2207/20208 ,  H04N1/64 ,  H04N5/35527 ,  H04N9/64 ,  H04N19/85 ,  H04N19/98

摘要： For obtaining an good yet easy to use luminance dynamic range conversion, we describe an HDR video decoder (250) comprising an image color processing apparatus (200) arranged to transform an input color (Y'UV_LDR) of a pixel of an input image (Im_in), which input image has a first luminance dynamic range (DR_1), into a red, green and blue color component output color (R'o, G'o, B'o) of a pixel of an output image (Im_res; REC_HDR), which output image has a second luminance dynamic range (DR_2), whereby the peak luminance of the first dynamic range is at least 2 times lower than the peak luminance of the second dynamic range or vice versa, comprising a coarse mapping unit (202; 552) arranged to apply a three-segment brightness re-grading curve which consists of a linear segment for a dark sub-range (SR_d) of the range of lumas of the input image colors comprising the darkest input luma values, which is determined by a slope variable (InvBet), a second linear segment for the lightest input luma values in a bright sub-range (SR_br), which is controlled by a second slope variable (InvAlph), and a parabolic segment in between the two linear segment.

摘要翻译： 为了获得良好且易于使用的亮度动态范围转换，我们描述了包括图像色彩处理设备（200）的HDR视频解码器（250），所述图像色彩处理设备（200）被配置为将输入图像的像素的输入色彩（Y'UV_LDR） （输入图像具有第一亮度动态范围（DR_1））转换成输出图像（Im_res;图像）的像素的红色，绿色和蓝色分量输出颜色（R'o，G'o，B'o） 所述输出图像具有第二亮度动态范围（DR_2），由此所述第一动态范围的峰值亮度比所述第二动态范围的峰值亮度低至少2倍，反之亦然，其包括粗略映射单元（ 202; 552），其被布置成应用由包括最暗输入亮度值的输入图像颜色的亮度范围的暗子范围（SR_d）的线性段组成的三段亮度再分级曲线， 由一个斜率变量（InvBet）确定，为最轻的输入的第二个线性段 由第二斜率变量（InvAlph）控制的明亮子范围中的亮度值（SR_br）以及两个线性段之间的抛物线段。

公开(公告)号：EP3110154A4

公开(公告)日：2017-10-11

申请号：EP15752009

申请日：2015-02-16

申请人： SONY CORP

发明人： TSUKAGOSHI IKUO

IPC分类号： H04N19/98 ,  H04N19/30 ,  H04N19/70

CPC分类号： H04N19/70 ,  H04N19/186 ,  H04N19/30 ,  H04N19/513 ,  H04N19/98

公开(公告)号：EP3185561A1

公开(公告)日：2017-06-28

申请号：EP16204910.0

申请日：2016-12-19

申请人： THOMSON Licensing

发明人： ANDRIVON, Pierre ,  ROBERT, Antoine ,  BORDES, Philippe

IPC分类号： H04N19/463 ,  H04N19/467 ,  H04N19/98 ,  H04N19/39

CPC分类号： H04N19/172 ,  H04N19/117 ,  H04N19/12 ,  H04N19/176 ,  H04N19/184 ,  H04N19/39 ,  H04N19/44 ,  H04N19/463 ,  H04N19/467 ,  H04N19/98

摘要： The disclosure relates to a method for encoding a sequence of frames with a first dynamic range, comprising:
- obtaining (11), for at least one frame with a first dynamic range of said sequence, at least one frame with a second dynamic range and at least one illumination map, said first dynamic range being higher than said second dynamic range,
- embedding (12) said at least one illumination map within said at least one frame with a second dynamic range, by:
- obtaining, for at least one block of said at least one frame with a second dynamic range, selection parameters for selecting at least one bit of at least one information element obtained from said at least one block,
- modifying at least one selected least significant bit, to carry data representing at least a part of said at least one illumination map.

摘要翻译： 本公开涉及一种用于对具有第一动态范围的帧序列进行编码的方法，包括： - 针对具有所述序列的第一动态范围的至少一个帧，获得具有第二动态范围的至少一个帧，以及 至少一个照明图，所述第一动态范围高于所述第二动态范围， - 通过以下操作将所述至少一个照明图嵌入（12）具有第二动态范围的所述至少一个帧内： - 获得至少一个 所述至少一个帧的块具有第二动态范围，用于选择从所述至少一个块获得的至少一个信息元素的至少一个比特的选择参数，修改至少一个选择的最低有效位，携带表示在 所述至少一个照明图的至少一部分。

公开(公告)号：EP3169070A1

公开(公告)日：2017-05-17

申请号：EP15306816.8

申请日：2015-11-16

申请人： Thomson Licensing

发明人： LELEANNEC, Fabrice ,  LASSERRE, Sébastien ,  GALPIN, Franck ,  POIRIER, Tangi

IPC分类号： H04N19/98 ,  H04N19/196 ,  G06T5/00

CPC分类号： H04N19/98 ,  G06T5/009 ,  G06T2207/10024 ,  H04N19/197 ,  H04N19/70

摘要： A method for coding an HDR picture is disclosed that comprises:
- mapping the HDR picture to obtain a SDR picture;
- determining color correcting parameters;
- color correcting said SDR picture responsive to said color correcting parameters; and
- encoding the color corrected SDR picture in a stream.
In the method, determining color correcting parameters comprises:
- determining an intermediate SDR picture so that at least one color appearance value is preserved between said HDR picture and said intermediate SDR picture;
- determining the color correcting parameters from said intermediate SDR picture and from said SDR picture.

摘要翻译： 公开了一种用于编码HDR图片的方法，其包括： - 映射HDR图片以获得SDR图片; - 确定颜色校正参数; - 响应于所述颜色校正参数对所述SDR图片进行颜色校正; 和 - 在流中编码色彩校正的SDR图片。 在该方法中，确定色彩校正参数包括： - 确定中间SDR图片，使得在所述HDR图片与所述中间SDR图片之间保留至少一个色彩表现值; - 从所述中间SDR图片和所述SDR图片确定颜色校正参数。

公开(公告)号：EP2777252B1

公开(公告)日：2016-02-10

申请号：EP12721453.4

申请日：2012-05-04

申请人： Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： GARBAS, Jens-Uwe ,  THOMA, Herbert

IPC分类号： H04N19/11 ,  H04N19/14 ,  H04N19/147 ,  H04N19/17 ,  H04N19/172 ,  H04N19/176 ,  H04N19/196 ,  H04N19/39 ,  H04N19/46 ,  H04N19/463 ,  H04N19/98 ,  H04N19/167

CPC分类号： H04N19/11 ,  H04N19/14 ,  H04N19/147 ,  H04N19/167 ,  H04N19/17 ,  H04N19/172 ,  H04N19/176 ,  H04N19/196 ,  H04N19/39 ,  H04N19/46 ,  H04N19/463 ,  H04N19/98

摘要： The ratio between coding quality on the one hand and coding rate on the other hand is increased. To this end, a global predictor and a local predictor are used in combination. The global predictor derives a global tone-mapping function based on a statistical analysis of pairs of values of co-located samples in the first tone-mapped version and the second version of the picture, and applies the global tone-mapping function onto the first tone-mapped version of the picture. The local predictor locally derives a locally varying tone-mapping function based on a statistical analysis of values of co-located samples in the second version of the picture and the globally predicted reference picture in units of sub-portions into which the globally predicted reference picture and the second version of the picture are partitioned, and applies the locally varying tone-mapping function onto the globally predicted reference picture.

摘要翻译： 另一方面，编码质量与编码率之间的比例增加。 为此，组合使用全局预测器和局部预测器。 全局预测器基于第一色调映射版本和第二版本的同位置采样值对的统计分析得出全局色调映射函数，并将全局色调映射函数应用于第一色调映射函数 色调映射版本的图片。 本地预测器本地基于对图像的第二版本中的共位样本的值的统计分析和全局预测参考图像的子部分的单位的全局预测参考图片来本地导出局部变化的色调映射函数 并且图像的第二版本被分割，并且将局部变化的色调映射功能应用到全局预测的参考图片上。

公开(公告)号：EP2958330A1

公开(公告)日：2015-12-23

申请号：EP14305949.1

申请日：2014-06-20

申请人： Thomson Licensing

发明人： Andrivon, Pierre ,  Lasserre, Sebastien ,  Francois, Edouard

IPC分类号： H04N19/98

CPC分类号： H04N19/44 ,  G06T3/40 ,  G06T7/90 ,  H04N19/127 ,  H04N19/132 ,  H04N19/136 ,  H04N19/172 ,  H04N19/186 ,  H04N19/70 ,  H04N19/98

摘要： The present disclosure generally relates to a method and device for decoding an HDR picture from a bitstream representing a LDR picture and an illumination picture. The method comprising:
- obtaining a decoded version of the HDR picture by multiplying the sample values of a decoded version of the LDR picture by the sample values of the decoded version of the illumination picture; and
- obtaining a color value expressed in an output color space for each sample value of the decoded version of the HDR picture, the method is characterized in that it further comprises:
- obtaining a color value expressed in the output color space for each sample value of a decoded version of the LDR picture just before multiplying said color values by the sample values of the decoded version of the illumination picture.

摘要翻译： 本发明基因的反弹涉及一种用于从比特流表示LDR图像和照明图像在HDR图像进行解码的方法和设备。 所述方法包括： - 通过乘以由的照明图像的经解码版本的样本值的LDR图像的解码版本的样本值获取的HDR图像的解码版本; 和 - 获得在过表达至输出色彩空间的HDR图像的经解码版本每个样本值的颜色值，该方法在为特征的那样，还包括： - 获得在输出颜色空间中过表达对每个采样值的颜色值 的LDR图像的解码版本之前通过的照明图像的经解码版本的样本值乘以所述颜色值。

公开(公告)号：EP2958329A1

公开(公告)日：2015-12-23

申请号：EP14305920.2

申请日：2014-06-16

申请人： Thomson Licensing ,  INRIA - Institut National de Recherche en Informatique et en Automatique

发明人： Le Pendu, Mikaël ,  Thoreau, Dominique ,  Alain, Martin ,  Guillemot, Christine

IPC分类号： H04N19/98 ,  H04N19/593 ,  H04N19/463 ,  H04N19/625 ,  H04N19/176 ,  H04N19/126 ,  H04N19/136

CPC分类号： H04N19/625 ,  H04N19/126 ,  H04N19/136 ,  H04N19/176 ,  H04N19/42 ,  H04N19/45 ,  H04N19/463 ,  H04N19/593 ,  H04N19/98

摘要： A method for encoding and decoding an image block, an encoder, and a decoder are provided. The method for encoding an image block comprises: determining a local dynamic range of the block; adaptively precision-extending pixel values of the block based on the local dynamic range of the block; and encoding the block with an adaptively extended precision. The method for decoding an image block comprises: determining a minimum pixel value of the block and an indicating value for indicating a precision extension factor according to precision extension information; decoding the block according to the indicating value; and de-extending precision of the decoded block based on the minimum pixel value of the block and the precision extension factor. The precision of the intermediate calculations may be improved without increasing an original intermediate bit depth used in intermediate calculations.

摘要翻译： 提供了一种用于编码和解码的图像块，在编码器和解码器方法。 用于编码图像块的方法，包括：确定性采矿块的局部动态范围; 自适应精度延伸基于所述块的局部动态范围块的像素值; 并且编码具有在自适应地扩展精度的块。 对图像块进行解码的方法，包括：确定性采矿块和指示用于指示精度扩展因子gemäß到精度扩展信息值的最小像素值; 解码所述块gemäß到指示值; 和去扩展基于该块的最小像素值和精度扩展系数的解码块的精度。 中间计算的精度可以在没有在中间计算中使用的原始中间比特深度的增加得到提高。

公开(公告)号：EP2774361B1

公开(公告)日：2015-09-16

申请号：EP12784196.3

申请日：2012-11-01

申请人： Dolby Laboratories Licensing Corporation

发明人： SU, Guan-Ming ,  QU, Sheng ,  DALY, Scott

IPC分类号： H04N19/86 ,  G06T9/00 ,  H04N19/98

CPC分类号： G06T9/00 ,  H04N19/124 ,  H04N19/154 ,  H04N19/176 ,  H04N19/179 ,  H04N19/182 ,  H04N19/192 ,  H04N19/46 ,  H04N19/86 ,  H04N19/98

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

申请人： Koninklijke Philips N.V.

发明人： MERTENS, Mark Jozef Willem

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：EP3571662B1

公开(公告)日：2024-03-06

申请号：EP17832827.4

申请日：2017-12-28

发明人： KIKUCHI, Hiroaki ,  ONUKI, Jun ,  HIROSE, Masaki

IPC分类号： H04N19/98 ,  H04N5/202 ,  G06T5/00 ,  G06T5/40 ,  G09G3/00 ,  G09G5/00 ,  G09G5/02 ,  H04N23/50 ,  H04N23/66 ,  H04N23/80