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Coding and decoding method and device

An encoding method and encoding technology, applied in the field of video compression, can solve problems such as low quality

Inactive Publication Date: 2005-07-27
KONINK PHILIPS ELECTRONICS NV
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  • Description
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Problems solved by technology

However, less information may result in lower quality

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  • Coding and decoding method and device
  • Coding and decoding method and device
  • Coding and decoding method and device

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Embodiment Construction

[0018] If it is considered that for a wide range of applications (such as digital cinema, high-definition television, transmission and display of scientific images, ...), the ultimate consumer is the human eye, then the basic idea of ​​the present invention is : Choose a representation based on the segmentation of the visual signal sensed by the human primitive visual system, i.e., design the image code so that the image encoding matches the visual ability of the human observer.

[0019] Perceptual studies have shown that it is impossible for the human eye to distinguish small brightness changes (1-5 gray levels) under standard viewing conditions. Then the common processing method is to uniformly compress the dynamic brightness with fewer gray levels, for example, in figure 1 As indicated in , here 128 luminance gray levels are used instead of 256 gray levels (this is equivalent to 7-bit luminance encoding). Tests have shown that if this dynamic compression of brightness is f...

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Abstract

The invention relates to a method of coding an input digital video sequence corresponding to an original color image sequence, said method comprising at least a step for converting said video sequence from the spatial domain to less representation data, a quantization step, for transforming the converted signals thus obtained into a reduced set of data. According to the invention, said coding method also comprises, before said converting step, a pre-processing step, provided for determining if the input video sequence is in YUV color space, Y being the luminance component and U, V the chrominance components, and transforming said space into a less redundant color space by means of a non-linear transformation taking into account the possible lower quality finally obtained.

Description

technical field [0001] The present invention relates generally to video compression, and more particularly to a method of encoding a sequence of input digital video images corresponding to a sequence of original color images, said method comprising at least the following steps: [0002] (1) A transformation step for transforming said video sequence from the original spatial representation domain to less representational data (e.g. as used in transform coding, trellis-based coding, predictive coding, etc.) ; [0003] (2) a quantization step for transforming the converted signal thus obtained into a reduced data set; [0004] (3) An encoding step for encoding said reduced data set. [0005] The invention also relates to a corresponding encoder, to a method of decoding a signal encoded by means of said encoding method, to a corresponding decoder, and to a program comprising a computer readable program for implementing said encoding and decoding method code system. Background...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/30H04N11/04
CPCH04N11/044H04N11/04H04N19/186
Inventor G·马昆特J·容格
Owner KONINK PHILIPS ELECTRONICS NV
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