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Method and device for encoding image data and method and device for decoding image data

A coding parameter and coding technology, applied in the field of coded image data, can solve the problems of decoding image artifacts, unusable transmission applications, low compression ratio, etc.

Inactive Publication Date: 2019-09-13
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main disadvantage of this first method is that two coding schemes are used and it has the limitation that the dynamic range of the input image is twice that of the conventional coding scheme (16-20 bits)
Even though conventional codecs can handle high pixel (bit) depths, it is often difficult to encode at such bit depths in a uniform manner throughout the image, since the resulting compression ratios are too low for transmission applications
[0008] Other methods using encoding techniques that can be applied to LDR images can cause artifacts in the decoded image

Method used

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  • Method and device for encoding image data and method and device for decoding image data
  • Method and device for encoding image data and method and device for decoding image data
  • Method and device for encoding image data and method and device for decoding image data

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Embodiment Construction

[0097] figure 1 A schematic block diagram showing the steps of a method for encoding at least a part of an image I according to a first embodiment of the invention. figure 1The encoding steps of the method are generally based on the HEVC compression standard applicable to LDR-type images, but it should be recognized that embodiments of the present invention can also be applied to other encoding standards applicable to LDR-type images, such as H.264 / AVC , MPEG2 or MPEG4.

[0098] The method begins by acquiring HDR image data. HDR image data may represent a video sequence of multiple images, an image or a portion of an image. To simplify the description below, the acquired image data corresponds to an HDR image. HDR image data may be acquired directly from an imaging device such as a video camera, from a locally located or remotely arranged storage device, or received via a wireless or wired transmission line.

[0099] As used herein, the term "HDR image" refers to any HDR i...

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Abstract

A method and apparatus for encoding at least a portion of a large dynamic range image defined within a perceptual space having a luminance component and a color difference metric, the method comprising: by applying an encoding parameter set comprising at least one encoding parameter, using Applicable to the encoding process of a small dynamic range (LDR) image, to encode a segment of at least a portion of the image; reconstruct the encoded segment in a perceptual space of a large dynamic range; evaluate the encoded segment in a large dynamic range a rate-distortion cost within a perceptual space of dynamic range; and based on the estimated rate-distortion cost, adjusting said encoding parameter set for an encoding process of the segment. Corresponding decoding devices and methods are also provided.

Description

technical field [0001] The invention relates to a method and a device for encoding image data as well as a method and a device for decoding image data. In particular, but not exclusively, the invention relates to the encoding and decoding of video data for high dynamic range (HDR) applications. Background technique [0002] The variation of light in a scene captured by an imaging device can be very large. For example, objects in the shadow of a scene appear very dark compared to objects lit by direct sunlight. The limited dynamic range and color gamut provided by traditional low dynamic range (LDR) images do not provide enough range to accurately reproduce the changes in brightness and color in such scenes. Generally, a component value of an LDR image representing the brightness or color of a pixel of the LDR image is represented by a limited number of bits (typically, 8 bits, 10 bits, or 12 bits). The limited luminance range provided by this representation cannot efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/19H04N19/30H04N19/176H04N19/147H04N19/103
CPCH04N19/176H04N19/147H04N19/30H04N19/103H04N19/19H04N19/182H04N19/70H04N19/96H04N19/98
Inventor 法布里斯·勒安尼塞巴斯蒂安·拉萨尔大卫·图泽
Owner THOMSON LICENSING SA