Research progress in video motion estimation techniques in the wavelet domain

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.EI0101716-17272