Adaptive context-based arithmetic coding of arbitrary contour maps

摘要

An efficient technique for encoding arbitrary contours isnpresented. It is based on the concept of transition points of a contournmap and relies on a new four-symbol adaptive context-based arithmeticnencoder (CAE) that calculates contexts in the (binary) domain of thencontour map. The results obtained with this new technique, applied tonthe compression of image partitions, are substantially better than thosenpreviously attained, showing a clear superiority over adaptive CAE-basedndifferential chain coding and also over the MPEG-4 shape coding