Scalable video compression and spatiotemporal scalability with lifted pyramid and antialiased DWT schemes

摘要

This paper examines the effects of aliasing and investigates the extent to which different transform structures support spatiotemporal scalability. The efficacy of an open-loop spatial pyramid and anti-aliased DWT schemes are assessed under scalable conditions in terms of their ability to generate highly compressible quality embedded subsets at reduced resolution. The main emphasis is placed on lifting inspired structures with noise suppression or anti-aliasing properties. As an example, the DWT is augmented with spectral energy exchange lifting steps which disperse aliased content from critical regions of the video sequence at reduced resolution. Finally, we propose alternate ways to characterize a video compression system based on the amount of shift variance and aliasing distortion incurred in half resolution sequences.