Method and device for coding a sequence of source images

Abstract

The method comprising: a step for partitioning (1) the image into regions, a region being made up of a set of consecutive or non-consecutive blocks, according to the television scanning order of the image, an inter- or intra-block coding step (3, 4), the blocks being coded by region according to an ordering of the regions, and, for a region, according to the order of succession of the blocks that make up the region, a coded block error correction step, is characterized in that, a step for analysing the field of movement (10) is carried out to calculate a "lifespan" parameter assigned to a block and corresponding to its probability of existence in subsequent images, according to the movement vector associated with this block, the partitioning step (1) is performed taking into account the value of this parameter to define and order the regions of the image from most important to least important, the error correction step uses a more effective error correction algorithm for the coded data corresponding to the first regions than for the data corresponding to the latter regions.

Description

technical field [0001] The present invention relates to a method and device for encoding video sequence images, in particular to encoding in the form of image blocks using time correlation between images based on moving field calculation. [0002] For example, this field is video coding of the H.264 / AVC type. Background technique [0003] Unlike previous video coding standards, H.261, H.263, MPEG2 or MPEG4, depending on the television-type picture scanning direction, a sequential set or slice of macroblocks may consist of non-consecutive macroblocks in the picture. This possibility is called Flexible Macroblock Order (FMO). For example FMO tools have been described by S Wenger and M Horowitz in JVT-C089 ISO / MPEG & ITU May 2002. [0004] In the environment of transmitting video images in a multi-vendor network, usually the so-called high transmission error rate is defined by the number of packet loss, therefore, in order to protect the packets consisting of compressed data,...

AI Technical Summary

Problems solved by technology

These error correction algorithms are based on redundancy, so the cost of encoding is relatively high, however, they do not divide the image area according to the importance of encoding

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