Region of interest coding in JPEG2000 for interactive client/server applications

This paper presents an approach which allows an efficient on-the-fly decoding of regions of interest of an already encoded image without need for a complete decoding/encoding process. The basic method is compatible with the wavelet based compression scheme adopted for the JPEG2000 standard and has been already adopted in a previous verification model. This technique is specially of value in interactive client/server applications linked through narrowband networks, in which the client can request the server to tailor more efficiently the transmission of the desired information at little processing cost. Simulation results show significant improvement in reduction of transmission time and enhanced flexibility at the expense of a very small complexity and bit rate overhead.