METHOD AND SYSTEM FOR ENCODING AN IMAGE SIGNAL, ENCODED IMAGE SIGNAL, METHOD AND SYSTEM FOR DECODING AN IMAGE SIGNAL

摘要

An image signal is encoded to reduce artifacts. In an original image frame (F) one or more gradual transition areas (R) are identified, in a decoded frame (F') corresponding one or more gradual transition areas (R') are identified, functional parameters (C) describing the data content of the one or more gradual transition areas of the original image frame are established and position data (P) for the positions of the one or more corresponding areas (R') in the decoded frame (F') are established. Replacing the content of the areas R' in the decoded frame with the reconstructed content of the areas R in the original frame improves the quality of the decoded frame.