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    Methods and apparatuses for encoding an HDR images, and methods and apparatuses for use of such encoded images
    2.
    发明授权
    Methods and apparatuses for encoding an HDR images, and methods and apparatuses for use of such encoded images 有权

    公开(公告)号：US11368724B2

    公开(公告)日：2022-06-21

    申请号：US17010923

    申请日：2020-09-03

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： Renatus Josephus Van Der Vleuten ,  Mark Jozef Willem Mertens

    IPC分类号： G06K9/00 ,  H04N19/98 ,  G09G3/20 ,  H04N19/30 ,  H04N19/46 ,  G09G5/10 ,  H04N5/20 ,  G06T9/00 ,  H04N19/186 ,  H04N19/44 ,  G06T5/00 ,  H04N7/01

    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).

    Apparatus and method for dynamic range transforming of images
    3.
    发明授权
    Apparatus and method for dynamic range transforming of images 有权

    公开(公告)号：US10916000B2

    公开(公告)日：2021-02-09

    申请号：US14345826

    申请日：2012-09-20

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： Renatus Josephus Van Der Vleuten ,  Charles Leonardus Cornelius Maria Knibbeler

    IPC分类号： G06T5/00 ,  G06T5/50 ,  H04N9/68 ,  G11B20/10 ,  G11B27/10 ,  G11B27/32 ,  G09G5/00 ,  H04N7/00 ,  G09G5/10 ,  G06T11/00 ,  G09G3/20

    摘要： An image processing apparatus comprises a receiver (201) for receiving an image signal comprising an encoded image. Another receiver (1701) receives a data signal from a display (107) where the data signal comprises a data field that comprises a display dynamic range indication of the display (107). The display dynamic range indication comprises at least one luminance specification for the display. A dynamic range processor (203) is arranged to generate an output image by applying a dynamic range transform to the encoded image in response to the display dynamic range indication. An output (205) outputs an output image signal comprising the output image to the display. The transform may furthermore be performed in response to a target display reference indicative of a dynamic range of display for which the encoded image is encoded. The invention may be used to generate an improved High Dynamic Range (HDR) image from e.g. a Low Dynamic Range (LDR) image, or vice versa.

    Scalable image coding and decoding
    5.
    发明授权
    Scalable image coding and decoding 有权
    可扩展的图像编码和解码

    公开(公告)号：US09071824B2

    公开(公告)日：2015-06-30

    申请号：US14276475

    申请日：2014-05-13

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： Renatus Josephus Van Der Vleuten

    IPC分类号： G06K9/46 ,  H04N19/625 ,  H04N19/176 ,  H04N19/70 ,  H04N19/122 ,  H04N19/60 ,  H04N19/12 ,  H04N19/136 ,  H04N19/17 ,  H04N19/27 ,  H04N19/34

    CPC分类号： H04N19/625 ,  H04N19/12 ,  H04N19/122 ,  H04N19/136 ,  H04N19/17 ,  H04N19/176 ,  H04N19/27 ,  H04N19/34 ,  H04N19/60 ,  H04N19/70

    摘要： A method and device for encoding an image into a scalable bitstream, the method including acts of dividing the Image in image blocks; encoding each image block in accordance with one of a plurality of different encoding modes, to obtain corresponding block bitstreams comprising one or more types of data representative of said encoding mode; and forming the scalable bitstream by iteratively scanning the block bitstreams, each scan including acts of: selecting at least one of said types of data, including in the scalable bitstream data of the selected types from the block bitstreams, and including in the scalable bitstream flags indicating the selected types of data.

    摘要翻译： 一种用于将图像编码为可分级比特流的方法和装置，所述方法包括将图像划分成图像块的动作; 根据多个不同的编码模式之一对每个图像块进行编码，以获得包括代表所述编码模式的一种或多种类型的数据的相应的块比特流; 并且通过迭代地扫描所述块比特流来形成所述可分级比特流，每个扫描包括以下动作：从所述块比特流中选择所述类型的数据中的至少一种，包括所选类型的可缩放比特流数据，并且包括在所述可缩放比特流标志 指示所选择的数据类型。

    Multi-range HDR video coding
    7.
    发明授权
    Multi-range HDR video coding 有权

    公开(公告)号：US11272195B2

    公开(公告)日：2022-03-08

    申请号：US17266650

    申请日：2019-08-22

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： Renatus Josephus Van Der Vleuten ,  Rutger Nijland ,  Johannes Yzebrand Tichelaar

    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).

    Mapping between linear luminance values and luma codes
    10.
    发明授权
    Mapping between linear luminance values and luma codes 有权

    公开(公告)号：US10419689B2

    公开(公告)日：2019-09-17

    申请号：US16206525

    申请日：2018-11-30

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： Renatus Josephus Van Der Vleuten

    IPC分类号： H04N5/235 ,  H04N19/186 ,  H04N5/202 ,  H04N9/804

    摘要： To enable better encoding of the currently starting to appear high dynamic range images for use in full high dynamic range technical systems (containing an HDR display, and e.g. in an HDR grading application), we invented a method of constructing a code allocation function for allocating pixel colors having pixel luminances to codes encoding such pixel luminances, in which the step of determining the code allocation function to be applied to at least one color coordinate of the pixel to obtain a code value, comprises constructing that function out of at least two partial functions, and similar methods at a receiving side, and apparatuses, and signals for communicating between the two sites. This method allows—in line with applicant's technical approach that HDR images should actually be communicated as a spectrum of differently regraded different dynamic range images of the same scene, e.g. a master HDR image and another image of the same HDR scene encoded with a different dynamic range and peak brightness than the master HDR image, and one of these images should be communicated to receivers together with luminance mapping functions co-communicated in metadata allowing the calculation at the receiving side of the non-transmitted different dynamic range image—a better application of dynamically per scene optimizable luminance mapping functions.