Method and apparatus for encoding and decoding HDR images

An image and coding technology, applied in image enhancement, image analysis, image communication, etc., can solve the problems of increasing the implementation method and computing overhead.

Active Publication Date: 2016-10-26
INTERDIGITAL VC HLDG INC
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High bit depth extensions may require increa

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  • Method and apparatus for encoding and decoding HDR images
  • Method and apparatus for encoding and decoding HDR images
  • Method and apparatus for encoding and decoding HDR images

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[0023] This principle involves the use of tone mapping technology to encode and decode HDR images and videos. The tone mapping function takes a high bit depth integer as input and returns a low bit depth integer, and the inverse tone mapping function takes a low bit depth integer as input and returns a high bit depth integer. In this application, the terms "tone mapping function", "tone mapping curve" and "tone curve" are used interchangeably, and the terms "inverse tone mapping function" and "inverse tone mapping curve" are used interchangeably.

[0024] In one embodiment, such as figure 1 As shown in, a mathematical model of a compression scheme is defined. In this model, the image is considered compressed and the pixels have real values ​​(not necessarily integers). The input image I has a probability distribution function (pdf)p, and its minimum and maximum pixel values ​​are x min And x max .

[0025] First, the compression function F is applied to the pixel values, where...

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Abstract

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.

Description

[0001] Cross references to related applications [0002] This application claims the rights of European application number 14305266 filed on February 26, 2014 and European application number 14305480 filed on April 1, 2014, the entire contents of which are incorporated herein by reference. Technical field [0003] The present invention relates to a method and device for encoding and decoding high dynamic range (HDR) images and videos. Background technique [0004] Tools for compressing image sequences are often designed to encode integer data with limited dynamic range. For example, compression standards such as MPEG-4 AVC / H.264 and HEVC (High Efficiency Video Coding) can be used to compress images and videos whose color components are represented by 8-bit integers. In extended versions of these standards, data with higher bit depth can be used as input. For example, in the range extension version of HEVC, a bit depth with an upper limit of 16 bits is supported. The high bit dept...

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Application Information

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IPC IPC(8): G06T5/00G06T5/40H04N19/30
CPCG06T5/40G06T2207/20208H04N19/30H04N19/147H04N19/117H04N19/186G06T5/009C10G2/31C10G2/32C10G5/00C10G45/58C10G47/00C10G49/00C10G67/00H04N19/19H04N19/124H04N19/177H04N19/172H04N19/98H04N19/88H04N19/126H04N19/184H04N19/44H04N19/91G06T2207/10024
Inventor 米凯尔·乐·潘都罗南·博塔德多米尼奇·梭罗克里斯汀·吉列莫特
Owner INTERDIGITAL VC HLDG INC
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