METHOD FOR DERIVING CODING INFORMATION FOR HIGH RESOLUTION IMAGES FROM LOW RESOLUTON IMAGES AND CODING AND DECODING DEVICES IMPLEMENTING SAID METHOD

摘要

The invention relates to spatially scalable encoding and decoding processes using a method for deriving coding information. More particularly, it relates to a method for deriving coding information used to encode high resolution images from coding information used to encode low resolution images when the ratio between high resolution and low resolution images dimensions is a multiple of 3/2. The method mainly comprises the following steps: - deriving (10) a block coding mode for each 8x8 blocks of a prediction macroblock Mbi_pred from the macroblock coding mode of the associated base layer macroblocks on the basis of the macroblock class of MBi and an the basis of the position of the 8x8 block within Mbi_pred; - deriving (11 ) a macroblock coding mode for Mbi_pred from the coding modes of the associated base layer macroblocks; and - deriving (12) motion information for each macroblock Mbi_pred from the motion information of the associated base layer macroblocks.