Interframe Coding Via Nonhomogeneous Progressive Transmission
Howard M. Dreizen · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1989
Progressive image transmission provides rapid reception of an image approximation, which is thereafter refined without incurring excess coding overhead. Nonhomogeneous techniques improve progressive reception by concentrating early transmission efforts on the most informative image areas, again without incurring excess coding overhead. A nonhomogeneous progressive coding method is described for interframe or intersample (nonconsecutive frame) coding and transmission. Working upon the simple difference of successive frames/samples, the coding method first transmits the most important differences followed by differences of lesser importance. The amount of coded data and the transmission time for each sample difference is proportional to the degree of image change. The nonhomogeneous, progressive, intersample coding method does not provide motion compensation, but does have the advantage of simplicity and low computational requirements. As all progressive techniques, the coding method is particularly suited for use with low bandwidth communication channels.