An adaptive motion estimation based on the temporal subband analysis

A new motion estimation scheme for an MPEG like video coder is suggested. The proposed `adaptive motion estimation´ scheme consists of five functional blocks: temporal subband analysis (TSBA), extraction of temporal activity distribution (TAD), scene change detection (SCD), picture type replacement (PTR), and a temporally adapted block matching algorithm (TABMA). All five functional blocks are developed primarily based on temporal subband analysis. According to the significance of the TAD, the TABMA adjusts its nonuniform motion vector search area. Also, a newly proposed SCD and PTR integrated method can prevent poor motion prediction for a video sequence containing abruptly changing scenes. Computer simulation results show that the proposed motion estimation scheme is superior to that of typical MPEG like video coders: it requires far less computations, and it shows much better performance