Variable-raster multiresolution video processing with motion compensation techniques
J.-R. Ohm, K. Rummler · 2002
The standard format for video acquisition, transmission and presentation uses an interlaced scanning technique. On the other hand for digital video services, the progressive format is more desirable in many situations, and different resolutions of the signal are required. The interlaced scan is based on a tight concatenation of vertical and temporal sampling effects. This paper introduces the technique of motion-compensated vertical filters within pairs of fields to solve the problem of sampling rate conversion between interlaced and progressive raster. It is shown that the motion-compensated vertical filter is a polyphase realization of a factor-2 up- or downsampling filterbank, with polyphase shift controlled by motion parameters. Possible applications are down- and up-conversion between progressive and interlaced formats, and multiresolution representation of video data within a spatio-temporal subband or wavelet framework.