Algorithm and architecture for multirate polyphase video scaling with panoramic effect and enhanced video quality

Traditional digital video scaling methods usually employ only linear approximation for output pixels, without any post processing. A new scaling method is presented in this paper. We propose an 8-fap 64 phases polyphase filter bank that combines a 3-tap peaking filter and a 6-tap 64 phases scaling polyphase filter. A third order cubic polynomial approximation method is introduced to generate linear and nonlinear scaling operations with the new polyphase filter structure. Panoramic effects are achieved by applying proper initial parameters for the first, second, and third order derivatives to control the behaviour of polynomial. Moreover, a simple implementation of horizontal and vertical peaking and scaling architecture is presented. Finally, examples showing different video enhanced results are provided.