Method for data type casting and algebraic manipulation in a scene description of audio-visual objects

摘要

A method for type casting data of different data types between two BIFS nodes. The method provides a simple, intuitive and easy method of creating a dynamic scene description that provides interactivity with the environment. This method removes the constant output constraint of the valuator defined in the MPEG-4 System Final Committee Draft dated 15 May 1998 (document ISO/IEC JTC1/SC29/WG11 N2201). The various conversion methods are disclosed for different data types as defined in the MPEG-4 System Final Committee Draft. The conversion methods are designed to be logical and to provide maximum usability in this enhanced version of the valuator node. <IMAGE>