Adaptive bit allocation and resolution selection techniques for motion estimation in wavelt-based video coder

摘要

Wavelet transform is an important tool for image an video coding applications. Several motion estimation techniques have been proposed in the wavelet domain. Coarse-to-fine motion estimation techniques generally have a lower complexity, but they may lead to inaccurate motion estimation if the coarse motion estimation is erroneous. On the other hand, pixel-domain motion estimation techniques provide a superior estimation, but at a higher complexity. In this paper, an efficient video coder in the wavelet domain is proposed. First, an adjustable resolution selection for motion estimation is proposed Where a low-pass subband at an appropriate resolution is employed for coarse motion estimation.