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Method for coding video data of a sequence of pictures

A video data and image sequence technology, applied in image communication, digital video signal modification, television, etc., can solve problems such as unsatisfactory solutions

Inactive Publication Date: 2007-09-19
THOMSON LICENSING SA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

These solutions for hiding artifacts are not satisfactory when image quality is considered

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  • Method for coding video data of a sequence of pictures
  • Method for coding video data of a sequence of pictures
  • Method for coding video data of a sequence of pictures

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Embodiment Construction

[0066] The temporal analysis circuit labeled 1 in FIG. 1 performs motion compensated temporal filtering by discrete wavelet transform (DWT). Suppose you apply this filtering method to an image with low spatial resolution and an image with high spatial resolution, such as subsampling the source image before filtering. The output of the circuit provides low and high spatial resolution H and L images.

[0067] A new procedure for encoding L images is proposed. The new procedure consists of two steps: the first step produces a default L image by performing a classical update step (eg, for connected pixels) and performing a classical management of unconnected pixels using transition filtering ; The second step is to optimize the L image, including analyzing the L image block by block and selecting the best mode from the default mode and the new update mode, where the block is kept as the first in the default mode The situation after the step.

[0068] Pixels in an L image can be...

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Abstract

The method implements an update step which is a selection among at least the following coding modes : - a default coding mode which doesn't use the motion compensation for the calculation of the pixel if the pixel is not connected or which performs a low pass motion compensated temporal filtering of picture H (9) of same level if the pixel is connected, - an update_MV coding mode which performs a low pass motion compensated temporal filtering of picture H (9) of same level according to a default motion vector calculated by taking into account motion vectors belonging to regions or pixels in the vicinity of the pixel to be calculated. Applications relate to video compression for transmission or storage of data.

Description

technical field [0001] The invention relates to a method and a device for encoding and decoding video data of a sequence of images, wherein the method and device implement motion-compensated temporal filtering. More specifically, the invention relates to the generation of low-pass images in the context of discrete wavelet transforms. Background technique [0002] In many current video coding algorithms (such as MPEG and / or t+2D wavelet-based schemes), the first step is to explore the temporal correlation between successive images, after which the spatial correlation of the images can be captured. Use motion-compensated transforms to reduce temporal redundancy. This is known as Motion Compensated Temporal Filtering or MCTF. A spatial transformation such as discrete cosine transform or discrete wavelet transform is used to reduce spatial redundancy. [0003] Figure 1 shows the structure of a known video coding scheme. Prior to encoding, consecutive video pictures are usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N7/32H04N7/50
CPCH04N19/00818H04N19/63
Inventor 帕特里克·洛佩斯吉约姆·布瓦松尼古拉斯·比尔丹
Owner THOMSON LICENSING SA