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1. 发明公开

EP3671626A1 METHOD AND DEVICE FOR DETERMINING CONTROL PARAMETERS FOR MAPPING AN INPUT IMAGE WITH A HIGH DYNAMIC RANGE TO AN OUTPUT IMAGE WITH A LOWER DYNAMIC RANGE 审中-公开
公开(公告)号：EP3671626A1
公开(公告)日：2020-06-24
申请号：EP18213909.7
申请日：2018-12-19
申请人： Thomson Licensing
发明人： ANDRIVON, Pierre , TOUZE, David , SERRE, Catherine
IPC分类号： G06T5/00 , H04N5/232 , H04N19/186
摘要： According to at least one embodiment, there is provided a method for determining control parameters for mapping an input image (I LMax ) of a content, said image comprising pixels having luminance values represented with a high dynamic range bounded by a maximum luminance value (L Max ) to an image of the same content, said image comprising pixels having luminance values represented with a lower dynamic range, said method comprising :
- the computation (71) of an image characteristic parameter (IC LMax ) of the input image;
- the determination (74) of said control parameters (CP LMax ):
∘ from said image characteristic (IC LMax ), if said input image has a maximum luminance value (L Max ) less or equal than a maximum reference luminance value (L Ref );
∘ otherwise, from a converted image characteristic (cIC LMax ), said converted image characteristic being configured to set at least one of said control parameters of at the value that the determination step would have determined for a reference image (I LRef ) of the same content, said reference image having intensities represented with a high dynamic range bounded by said maximum reference luminance (L Ref ).

2. 发明公开

EP3348056A1 METHODS AND DEVICES FOR ENCODING AND DECODING A SEQUENCE OF PICTURES, AND CORRESPONDING COMPUTER PROGRAM PRODUCTS AND COMPUTER-READABLE MEDIUM 有权转让
公开(公告)号：EP3348056A1
公开(公告)日：2018-07-18
申请号：EP16758202.2
申请日：2016-09-01
申请人： Thomson Licensing
发明人： BORDES, Philippe , ANDRIVON, Pierre , SALMON, Philippe
IPC分类号： H04N19/186 , H04N19/117 , H04N19/463 , H04N19/136 , H04N19/86
CPC分类号： H04N19/186 , H04N19/117 , H04N19/136 , H04N19/463 , H04N19/50 , H04N19/82 , H04N19/85 , H04N19/86
摘要： The disclosure relates to a method for decoding a video stream representative of a sequence of pictures, comprising: - obtaining (22) at least a first color component and a second color component of a picture unit, - decoding (23) at least one parameter of a post-processing of the second component, said at least one parameter being defined as a function of the first color component, - applying (24) said at least one post-processing to the second color component of the picture unit responsive to said at least one decoded parameter and to said first color component.

3. 发明公开

EP3329677A1 METHODS AND DEVICES FOR ENCODING AND DECODING A HDR COLOR PICTURE 审中-公开
公开(公告)号：EP3329677A1
公开(公告)日：2018-06-06
申请号：EP16793759.8
申请日：2016-06-27
申请人： Thomson Licensing
发明人： LELEANNEC, Fabrice , LASSERRE, Sebastien , ANDRIVON, Pierre
IPC分类号： H04N19/30
CPC分类号： H04N19/60 , G06T5/009 , G06T5/10 , H04N9/643 , H04N9/68 , H04N9/77 , H04N19/30
摘要： The present disclosure generally relates to a method and device of encoding a High Dynamic Range (HDR) color picture and at least one first Standard Dynamic Range (SDR) color picture, said method comprising encoding (101) a second Standard Dynamic Range (SDR) color picture obtained from the HDR color picture; According to the present disclosure, said method further comprises determining (102) at least one piece of color remapping information, from said second Standard Dynamic Range (SDR) color picture to said at least one first Standard Dynamic Range (SDR) color picture, said at least one piece of color remapping information being used to obtain an approximation of said at least one first Standard Dynamic Range (SDR) color picture from said second Standard Dynamic Range (SDR) color picture.

4. 发明公开

EP3326363A1 METHODS AND DEVICES FOR ENCODING/DECODING VIDEOS 审中-公开
公开(公告)号：EP3326363A1
公开(公告)日：2018-05-30
申请号：EP16736115.3
申请日：2016-07-06
申请人： Thomson Licensing
发明人： FRANCOIS, Edouard , LOPEZ, Patrick , ANDRIVON, Pierre , OLIVIER, Yannick
IPC分类号： H04N9/67
CPC分类号： H04N21/440236 , H04N1/644 , H04N9/67 , H04N19/70 , H04N21/25825
摘要： A method is disclosed that comprises : obtaining (S10) a video from a stream; obtaining (S12) a piece of information representative of a version of a piece of color mapping information; determining (S14) a piece of color mapping information responsive to said piece of information representative of a version; and color mapping (S16) the decoded video with said determined piece of color mapping information.

5. 发明公开

EP3249930A1 METHOD, APPARATUS AND STREAM OF FORMATTING AN IMMERSIVE VIDEO FOR LEGACY AND IMMERSIVE RENDERING DEVICES 有权转让
标题翻译：为传统和沉浸式渲染设备格式化沉浸式视频的方法，设备和流
公开(公告)号：EP3249930A1
公开(公告)日：2017-11-29
申请号：EP17171783.8
申请日：2017-05-18
申请人： Thomson Licensing
发明人： LASSERRE, Sébastien , GALPIN, Franck , ANDRIVON, Pierre
IPC分类号： H04N21/2343 , G06T3/00 , H04N19/70
摘要： The present disclosure relates to methods, apparatus or systems for generating, transmitting and decoding a backward compatible immersive video stream. The stream is carrying data representative of an immersive video, composed of a frame organized according to a layout comprising a first area encoded according to a rectangle mapping, a second area encoded according to a mapping transitory from the rectangular mapping to an immersive mapping and a third area encoded according to the immersive mapping. In order to be backward compatible, the stream further comprises a first information representative of the size and the location of the first area within the video frame, and a second information comprising at least the type of the selected layout, the field of view of first part, of the size of said second area within the video frame and a reference direction.
摘要翻译：本公开涉及用于生成，发送和解码后向兼容拟真视频流的方法，装置或系统。该流携带表示由根据布局组织的帧的数据表示的沉浸式视频的数据，所述布局包括根据矩形映射编码的第一区域，根据从矩形映射暂时映射到沉浸映射的映射编码的第二区域以及根据沉浸式映射编码的第三区域。为了向后兼容，该流还包括表示视频帧内的第一区域的大小和位置的第一信息，以及至少包括所选择的布局的类型，第一视野部分视频帧内的所述第二区域的大小和参考方向。

6. 发明公开

EP3213511A1 A METHOD AND DEVICE FOR ESTIMATING A COLOR MAPPING BETWEEN TWO DIFFERENT COLOR-GRADED VERSIONS OF A SEQUENCE OF PICTURES 审中-公开
标题翻译：用于估计图片序列的两个不同颜色渐变版本之间的颜色映射的方法和装置
公开(公告)号：EP3213511A1
公开(公告)日：2017-09-06
申请号：EP15784664.3
申请日：2015-10-22
申请人： Thomson Licensing
发明人： BORDES, Philippe , LASSERRE, Sebastien , ANDRIVON, Pierre
IPC分类号： H04N9/67 , G09G5/02 , G06T7/40 , H04N1/60 , G03B21/20 , H04N21/41 , G06T7/00
CPC分类号： H04N1/6066 , G09G5/026 , G09G2340/06 , H04N1/6005 , H04N1/6019 , H04N1/6058 , H04N9/67
摘要： The present disclosure relates to a method and device for processing a sequence of pictures comprising estimating a color mapping between a first color-graded version of said sequence of pictures whose values are represented in a first color volume and a second color-graded version of said sequence of pictures whose values are represented in a second color volume. The method is characterized in that it comprises: - obtaining (10) a first composite picture by assembling at least two pictures of the first color-graded version of the sequence of pictures in order that the content of said first composite picture comprises at least a part of the content of each of said at least two pictures, and the second composite picture is obtained by assembling at least two pictures of the second color- graded version of the sequence of pictures in order that the content of said second composite picture comprises at least a part of the content of each of said at least two pictures; and - estimating (20) said color mapping between said first and second color-graded versions of the picture by estimating a color mapping function that maps the color values of said first composite picture onto the color values of said second composite picture.
摘要翻译：本发明涉及一种用于处理图片序列的方法和设备，包括：估计所述图片序列的第一颜色分级版本与第二颜色分级版本之间的颜色映射，所述第一颜色分级版本的值以第一颜色体积表示，其值以第二颜色体积表示的图像序列。该方法的特征在于其包括： - 通过组装在图像序列的第一颜色分级版本中暂时位于确定的时刻的至少两个图像和通过组装第二组合图像来获得（10）第一合成图像在相同的确定的时刻，暂时位于图片序列的第二颜色分级版本中的相同数量的图片; 以及 - 通过估计将所述第一合成图片的颜色值映射到所述第二合成图片的颜色值上的颜色映射函数来估计（20）所述图片的所述第一和第二颜色分级版本之间的所述颜色映射。

7. 发明公开

EP3122032A1 A METHOD AND DEVICE FOR ESTIMATING A COLOR MAPPING BETWEEN TWO DIFFERENT COLOR-GRADED VERSIONS OF A PICTURE 审中-公开
标题翻译：方法和设备，用于估计颜色分配之间两个版本不同的颜色分级的图像序列
公开(公告)号：EP3122032A1
公开(公告)日：2017-01-25
申请号：EP15306188.2
申请日：2015-07-22
申请人： Thomson Licensing
发明人： ANDRIVON, Pierre , LASSERRE, Sebastien , BORDES, Philippe
IPC分类号： H04N1/60 , G06T5/00
CPC分类号： H04N1/6066 , G09G5/02 , G09G2340/06 , H04N9/67 , H04N9/68
摘要： The present disclosure relates to a method and device for estimating a color mapping between a first and a second color-graded version of a picture by iteratively estimating a color mapping function that maps each color value of said first color-graded version of the picture represented in a first color volume onto a color value of said second color-graded version of the picture represented in a second color volume. The method is characterized in that it comprises obtaining (100) a first estimate of the color mapping by:
- obtaining (200) a first sub-set of color values from the color values of said first color-graded version of the picture and a second sub-set of color values from the color values of said second color-graded version of the picture; ;
- obtaining (220) iteratively the first estimate of the color mapping function, from a default color mapping, by mapping the first set of color values onto the second set of color values.
摘要翻译：本发明涉及一种方法和设备，用于通过迭代地估计颜色映射函数并映射的图像的所述第一颜色分级的版本每个颜色值表示估计第一和图像的第二颜色分级的版本之间的颜色映射以第一颜色体积走上的以第二颜色体积代表的图象的所述第二颜色分级的版本的颜色值。获得（200）的颜色值从画面的和所述第一颜色分级的版本的颜色值的第一子集 - ：所述方法是在这样做是包括获得（100）由所述colormapping的第一估计为特征的第二子集从所述画面的所述第二颜色分级的版本的颜色值的颜色值; ; - 获得（220）迭代地颜色映射函数的第一估计，从默认颜色映射，通过映射所述第一组颜色值到第二组颜色值。

8. 发明公开

EP2984836A1 METHOD FOR ENCODING AND METHOD FOR DECODING A LUT AND CORRESPONDING DEVICES 有权转让
标题翻译：方法用于解码LUT以及相关设备，编码及方法
公开(公告)号：EP2984836A1
公开(公告)日：2016-02-17
申请号：EP14712249.3
申请日：2014-03-17
申请人： Thomson Licensing
发明人： BORDES, Philippe , ANDRIVON, Pierre , JOLLY, Emmanuel
IPC分类号： H04N19/50 , H04N19/30 , H04N19/186 , H04N19/463
CPC分类号： H04N19/597 , H04N19/186 , H04N19/30 , H04N19/44 , H04N19/463 , H04N19/50 , H04N19/96
摘要： A method for encoding a LUT defined as a lattice of vertices is disclosed. At least one value is of each vertex of the lattice. The method comprises for a current vertex: predicting the at least one value of said current vertex from another value which is for example obtained from reconstructed values of neighboring vertices; and encoding in a bitstream at least one residue computed between the at least one value of the current vertex and its prediction in a bitstream.

9. 发明公开

EP3672219A1 METHOD AND DEVICE FOR DETERMINING CONTROL PARAMETERS FOR MAPPING AN INPUT IMAGE WITH A HIGH DYNAMIC RANGE TO AN OUTPUT IMAGE WITH A LOWER DYNAMIC RANGE 审中-公开
公开(公告)号：EP3672219A1
公开(公告)日：2020-06-24
申请号：EP18213417.1
申请日：2018-12-18
申请人： Thomson Licensing
发明人： ANDRIVON, Pierre , TOUZE, David , LOPEZ, Patrick
IPC分类号： H04N1/60 , G06T5/00
摘要： According to at least one embodiment, there is provided a method for determining control parameters for mapping an input image (I LMax ) of a content, said image comprising pixels having luminance values represented with a high dynamic range bounded by a maximum luminance value to an output image of the same content, said image comprising pixels having intensities represented with a lower dynamic range, said method comprising :
- the computation (71) of a set of control parameters determining a mapping function as a piece-wise luminance mapping curve in a perceptually uniform domain normalized to a maximum reference luminance value, said set comprising a first parameter controlling a slope of a bottom linear section of the curve, a second parameter controlling a slope of an upper linear section of said curve, and a third parameter controlling a width of a parabolic mid-section connecting the bottom linear section to the upper linear section; and
- if said input image (I LMax ) has a maximum luminance value greater than said maximum luminance value, an adjustment (73) of said second control parameter for stretching of the upper linear section of said mapping function to an end point corresponding to a normalized ratio between the maximum luminance value and the maximum reference luminance value, the first control parameter being kept unchanged.

10. 发明公开

EP3595308A1 METHOD AND APPARATUS FOR ENCODING AN IMAGE 审中-公开
公开(公告)号：EP3595308A1
公开(公告)日：2020-01-15
申请号：EP18305942.7
申请日：2018-07-12
申请人： THOMSON Licensing
发明人： ANDRIVON, Pierre , COLAITIS, Marie-Jean , TOUZE, David
IPC分类号： H04N19/36 , H04N19/85 , H04N19/117 , H04N19/14 , H04N19/186
摘要： The present embodiments obtain chroma components representative of the chroma components of an output image from color components representative of an input image, and if a value of a pixel in at least one of said chroma components exceeds a given value, modify the value of said pixel in at least one of said color components in such a way that the value of said pixel in said at least one of said chroma components is lower than or equals to said given value.

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