Method and apparatus for encoding and decoding HDR images
    1.
    发明公开
    Method and apparatus for encoding and decoding HDR images 审中-公开
    Verfahren und Vorrichtung zur Codierung und -Decodierung von HDR-Bildern

    公开(公告)号:EP2927865A1

    公开(公告)日:2015-10-07

    申请号:EP14305480.7

    申请日:2014-04-01

    IPC分类号: G06T5/00 G06T5/40 H04N19/30

    摘要: To encode High Dynamic Range (HDR) images, the HDR images can be converted to Low Dynamic Range (LDR) images through tone mapping operation, and the LDR images can be encoded with an LDR encoder. The present principles formulates a rate distortion minimization problem when designing the tone mapping curve. In particular, the tone mapping curve is formulated as a function of the probability distribution function of the HDR images to be encoded and a Lagrangian multiplier that depends on encoding parameters. At the decoder, based on the parameters indicative of the tone mapping function, an inverse tone mapping function can be derived to reconstruct HDR images from decoded LDR images.

    摘要翻译: 要编码高动态范围(HDR)图像,HDR图像可以通过色调映射操作转换为低动态范围(LDR)图像,LDR图像可以用LDR编码器编码。 本原理在设计色调映射曲线时制定了速率失真最小化问题。 特别地,色调映射曲线被表达为要被编码的HDR图像的概率分布函数和取决于编码参数的拉格朗日乘数的函数。 在解码器中,基于指示色调映射函数的参数,可以导出逆色调映射函数,以从解码的LDR图像重建HDR图像。

    Method for processing a video sequence, corresponding device, computer program and non-transitory computer-readable medium
    3.
    发明公开
    Method for processing a video sequence, corresponding device, computer program and non-transitory computer-readable medium 审中-公开
    处理视频序列,相应的设备,计算机程序和非暂时性计算机可读介质的方法

    公开(公告)号:EP2922289A1

    公开(公告)日:2015-09-23

    申请号:EP15159305.0

    申请日:2015-03-17

    申请人: Thomson Licensing

    IPC分类号: H04N5/232 H04N5/235 H04N5/243

    摘要: The invention relates to a method for processing a video sequence formed by at least two video images, said method comprising:
    - obtaining (13) said at least two video images using a first capture module (120, 41) with a first field of view (C1), each video image representing a same scene captured at differents instants or from different points of view,

    wherein said method comprises:
    - determining (15) luminance information from at least one overall image obtained by a second capture module (121, 42) with a second field of view greater than said first field of view, said overall image representing the scene captured at different instants or from different points of view;,
    - down-converting (16) a dynamic range of said video images taking into account said luminance information.

    摘要翻译: 本发明涉及一种方法,用于处理由所述至少两个视频图像构成的视频序列,所述方法包括: - 获得(13)所述使用第一捕获模块(120,41),用第一视场的至少两个视频图像 (C1),表示在型动物时刻或从不同的观点,worin所述方法拍摄的同一场景中的每个视频图像的步骤包括: - 确定(15)的亮度从至少一个整体图像由第二捕获模块获得的信息(121,42 )的视比所述的第一视场大的第二场,所述整体图像表示在不同的时刻或从不同的观点捕获的场景; - 降频转换(16)考虑到所述视频图像的动态范围 说的亮度信息。

    Method for processing a video sequence, corresponding device, computer program and non-transitory computer-readable medium
    4.
    发明公开
    Method for processing a video sequence, corresponding device, computer program and non-transitory computer-readable medium 审中-公开
    处理视频序列,相应的设备,计算机程序和计算机可读介质transitionless的方法

    公开(公告)号:EP2922288A1

    公开(公告)日:2015-09-23

    申请号:EP14305379.1

    申请日:2014-03-18

    申请人: Thomson Licensing

    IPC分类号: H04N5/232 H04N5/235 H04N5/243

    摘要: The invention relates to a method processing a video sequence, said method comprising a step of obtaining at least one image using a first capture module, said at least one image representing a scene with a first capture angle, said at least one image being called video image.
    According to the invention, said method comprises the following steps:
    - obtaining, by using a second capture module different from said first capture module, metadata corresponding to at least one image representing said scene with a second capture angle strictly greater than said first capture angle, said at least one image being called overall image, said overall image comprising said video image,
    - determining luminance information from said metadata corresponding to said overall image,
    - conversion of a dynamic range of said video image taking into account of said luminance information.

    摘要翻译: 本发明涉及的方法处理视频序列,所述方法包括:使用第一捕获模块获取的至少一个图像的步骤,所述表示与第一捕获角的场景的至少一个图像,所述至少一个图像被称为视频 图像。 。根据本发明,所述方法包括以下步骤: - 获得通过使用第二捕获模块differentFrom所述第一撷取模块,元数据对应于至少一个图像表示与第二捕获角严格大于所述第一捕获角大于所述场景 中,所述至少一个图像被称为整体图像,所述整体图像包括所述视频图像, - 从所述元数据对应于所述确定的采矿亮度信息整体图像, - 所述视频图像的同时考虑到所述亮度信息的动态范围的转换。

    Method and apparatus for dynamic range expansion of LDR video sequence
    6.
    发明公开
    Method and apparatus for dynamic range expansion of LDR video sequence 审中-公开
    Verfahren und Vorrichtung zur dynamischen Bereichserweiterung einer LDR-Videosequenz

    公开(公告)号:EP2958076A1

    公开(公告)日:2015-12-23

    申请号:EP15172968.8

    申请日:2015-06-19

    申请人: Thomson Licensing

    IPC分类号: G06T5/00 G06T5/50

    摘要: A method and apparatus for dynamic range expansion of an LDR video sequence are suggested. The suggested method comprises the steps of: acquiring the LDR video sequence and at least one HDR panoramas concurrently, an image in said HDR encompassing a wider field of view than an image in said LDR; determining a dynamic range expansion operator based on the LDR video sequence and the HDR panoramas; and applying the determined dynamic range expansion operator on the LDR video sequence.

    摘要翻译: 提出了一种用于LDR视频序列的动态范围扩展的方法和装置。 所提出的方法包括以下步骤:同时获取LDR视频序列和至少一个HDR全景,所述HDR中的图像包含比所述LDR中的图像更宽的视场; 基于LDR视频序列和HDR全景确定动态范围扩展算子; 以及将所确定的动态范围扩展算子应用于LDR视频序列。

    Method for processing a video sequence, corresponding device, computer program and non-transitory computer-readable medium
    8.
    发明公开
    Method for processing a video sequence, corresponding device, computer program and non-transitory computer-readable medium 审中-公开
    处理视频序列相关联的装置,计算机程序和计算机可读介质transitionless的方法

    公开(公告)号:EP3016066A1

    公开(公告)日:2016-05-04

    申请号:EP14306741.1

    申请日:2014-10-30

    申请人: Thomson Licensing

    IPC分类号: G06T3/40 G06T5/00 G06T5/50

    摘要: The invention relates to a method for converting the dynamic range of at least one image of a group of images (11), said group of images representing at least one part of a scene.
    According to the invention, said method comprises the following steps, all implemented using a processor:
    - generating (12) at least one piece of information representative of said scene using at least one element belonging to the group comprising:
    o said group of images (11) and/or,
    o a synthetic result delivered by a 3D modelling (120) of said scene,

    - tone-mapping (13) said at least one image using said at least one piece of information representative of said scene.

    摘要翻译: 本发明涉及一种方法,用于将一组图像(11),所述组图像表示的场景的至少一部分的至少一个图像的动态范围。 。根据本发明,所述方法包括以下步骤,利用处理器的所有实施: - 生成(12),使用属于该组的,包括至少一个元素代表所述场景的信息中的至少一条:○所述组图像( 11)和/或由所述场景的3D建模(120)输送的合成结果以上 - 色调映射(13)所述至少一个图像使用所述至少一条代表所述场景的信息的。