METHODS FOR ENCODING AND DECODING IMAGES, CORRESPONDING ENCODING AND DECODING DEVICES AND COMPUTER PROGRAMS

摘要

The invention relates to a method for encoding an image represented by a sequence of symbols. According to the invention, the method includes the following steps: defining subsequences within said sequence; and going through the subsequences applying the following sub-steps for a routine subsequence: determining an adjacent routine encoded group including two previously encoded subsequences, one of which belongs to an adjacent encoded group associated with a subsequence that is separate from said routine subsequence; initialising a routine probability of occurrence of a symbol, taking into account two known probabilities of occurrence of said symbol, relating to two previously encoded subsequences of said adjacent routine encoded group; the consecutive entropic encoding of said symbols, and updating said routine probability of occurrence; and storing said routine probability of occurrence after encoding the last symbol.