METHOD AND DEVICES FOR ENCODING A SEQUENCE OF IMAGES INTO A SCALABLE VIDEO BIT-STREAM, AND DECODING A CORRESPONDING SCALABLE VIDEO BIT-STREAM

摘要

The invention relates to the field of scalable video coding, in particular to scalable video coding that would extend the High Efficiency Video Coding (HEVC) standard. An encoding method comprises encoding a base layer and an enhancement layer, including encoding an enhancement original INTRA image using intra-frame prediction only by: obtaining a residual image as a difference between the enhancement original INTRA image and a decoded corresponding encoded base image in the base layer, the residual image comprising blocks of pixels, each having a block type; transforming pixel values for a block into a set of coefficients each having a coefficient type, said block having a given block type; determining an initial coefficient encoding merit for each coefficient type; selecting coefficients based, for each coefficient, on the corresponding initial coefficient encoding merit and on a predetermined block merit; quantizing the selected coefficients into quantized symbols; and encoding the quantized symbols.