Method for coding and decoding an image sequence encoded with spatial and temporal scalability

A technology of image sequence and extended coding, which is applied in the field of video coding and decoding, and can solve problems such as image quality degradation

Inactive Publication Date: 2012-05-09
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in reduced image quality, especially when the image resolution becomes small relative to the size of the interpolation filter used for motion compensation

Method used

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  • Method for coding and decoding an image sequence encoded with spatial and temporal scalability
  • Method for coding and decoding an image sequence encoded with spatial and temporal scalability
  • Method for coding and decoding an image sequence encoded with spatial and temporal scalability

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Embodiment Construction

[0026] Consider here an encoding / decoding scheme based on 2D+t wavelets, which performs wavelet analysis / synthesis along the motion trajectory. The system operates on groups of pictures, or GOPs.

[0027] figure 2 The overall structure of the encoder is described.

[0028] The source image is sent to a temporal analysis circuit 4 which performs a motion compensated temporal analysis or MCTF (MCTF is an acronym for motion compensated temporal filtering) to obtain different frequency temporal frequency bands. The images are sent to motion estimation circuit 7, which calculates the motion field. These motion fields are sent to a "pruning" circuit 10 which "prunes" or simplifies the motion information computed by the motion estimation circuit to control the cost of motion. The motion field simplified in this way is sent to a temporal analysis circuit to define an analysis filter. The simplified sports field is also sent to the encoding circuit 11 for encoding.

[0029] The r...

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PUM

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Abstract

The invention relates to a method which is characterised in that the resolution selected for the movement information and the complexity of the interpolation filters used during a temporal filtering operation compensated in movement, depend on a decoding scenario, namely flow, temporal and spatial resolutions selected for the decoding either in terms of the corresponding temporal decomposition orof a combination of said parameters. The inventive method can be applied to so-called scalable video encoders / decoders, for example in the field of videotelephony or video transmission on the internet.

Description

technical field [0001] The invention relates to a method for video coding and decoding of spatially and temporally scalable coded image sequences by hierarchical temporal analysis using motion compensated temporal filtering. Background technique [0002] The scope of the invention is video compression based on spatial and / or temporal scalability schemes (also called "scalables"). For example this involves 2D+t wavelet coding including motion compensated temporal filtering. [0003] figure 1 A scalable encode-extract-decode system is shown. [0004] The source image is sent to the scalable video encoding circuit 1 . The obtained initial bit stream is processed by the extractor 2 to generate an extracted bit stream. This bit stream is decoded by a decoding circuit 3 which provides decoded video at an output. [0005] Scalability enables the generation of an initial bitstream from which binary substreams of adapted data sets (eg, streams), spatial resolution, temporal freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26
CPCH04N19/00781H04N19/00121H04N19/00818H04N7/364H04N7/2659H04N19/00066H04N19/0063H04N7/26808H04N7/26202H04N19/00739H04N7/26058H04N19/00206H04N19/00787H04N19/117H04N19/523H04N19/615H04N19/63
Inventor 爱德华·弗朗索瓦吉约姆·布瓦松热罗姆·维耶龙格温耐尔·马康菲利普·罗伯特
Owner THOMSON LICENSING SA
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