Differential Coding of Alpha Planes with Adaptive Quantization

: Alpha planes are used to composeobjects in order to build synthetic images.They contain the shape and the transparency ofthe different objects. The scene is composed bysuperimposing objects in a given order. The alphaplanes specify the transparencies of the objects. Inorder to independently compress these objects, thealpha planes must also be coded. In this paper,we present a way of coding alpha planes using 2Ddifferential coding. This technique quantizes alphaplanes without...