小波域视频运动估计研究进展

Research Progress in Video Motion Estimation Techniques in the Wavelet Domain

小波域运动估计技术作为基于小波的视频编码器中最关键的技术之一,成为近年来研究的热点.文章首先对比论述了空间域运动估计技术的不足和小波域运动估计技术的优势,然后以小波域运动估计技术的发展为主线,将目前的研究方法归纳为三类:对子带直接运动估计技术、子带间接运动估计技术和克服平移可变性的运动估计技术,并对三类运动估计方法的发展进行了概括性阐述和比较性研究,对三类方法中各种算法的适用范围、优势和所存在的问题进行了深入的讨论,在此基础上对小波域运动估计技术的未来发展趋势进行了展望.

In recent decade, the fact, that wavelet transform has gained a great success in the field of still image coding, moreover, it has been accepted as a powerful tool by the JPEG2000 standard, has attracted numerous researchers＇ attention in video coding field, so that they devoted themselves one after another to the research of wavelet-based video coding techniques. As one of the key techniques of video encoder, motion estimation technique in the wavelet domain has become a research hotspot in recent years. This paper firstly discusses the deficiency of motion estimation techniques in the spatial domain and the advantages of the ones in the wavelet domain. And secondly takes the development of the motion estimation techniques in the wavelet domain as the thread to sum up the present techniques as three kinds, namely, band to band motion estimation techniques, indirect band motion estimation techniques and shift-variant resistant motion estimation techniques, and then make a general discussion and comparative study on the three kinds of methods, which carries on a deep discussion on the scope of application, advantages and disadvantages of every method of each kind of techniques. Finally, at the basis of above, the state of arts and possible new directions of motion estimation techniques in the wavelet domain are stated.