Method and device for encoding an image using a prediction mask decoding method and device and corresponding signals and computer programs

摘要

A method is provided for encoding at least one image, divided into macroblocks, one macroblock including a set of blocks de pixels. The method includes, for at least one current macroblock of a current image, at least two iterations of the following steps: allocation of a priority level for encoding to at least one pixel of the current macroblock, selection of a pixel with the highest priority level called the priority pixel, prediction of a set of pixels including the priority pixel and a step of encoding a remainder from prediction for a region made up of predicted pixels of the macroblock, called the predicted region, the encoding step being used as and when the predicted region meets a predetermined encoding criterion.

主权项

1. A method comprising encoding with an encoding device at least one image, divided into macroblocks, one macroblock comprising a set of blocks of pixels,
wherein encoding implements, for at least one current macroblock of a current image:at least two iterations of the following steps:
assigning a level of encoding priority to at least one pixel of said current macroblock, adjacent to at least one previously predicted pixel, according to a predetermined criterion for determining priority; selecting a pixel having the highest level of priority, called a priority pixel; and predicting a set of pixels including said priority pixel, called a target set, implementing the following sub-steps:
identifying a template corresponding to a predetermined model region, adjacent to said target set, said template and said target set forming a block;searching in the previously encoded blocks of said current image or of a reference image for a source block comprising a zone similar to said template, wherein similarity of said similar zone is evaluated according to a criterion of minimization of error between said template and said similar zone; andbuilding said target set from said source block, delivering predicted pixels; and a step of encoding a prediction residue for a region formed by predicted pixels of the current macroblock, called a predicted region, by determining a difference between said predicted pixels of said predicted region and corresponding original pixels belonging to said current image, said encoding step being implemented once said predicted region meets a predetermined encoding criterion, before the totality of the pixels of said current macroblock is predicted such that a prediction boundary and an encoding boundary can vary from one another, said predetermined encoding criterion being based on a predetermined configuration in which the predicted pixels form a same row of pixels and/or a same column of pixels of said current macroblock.