Adaptive motion-compensated video coding scheme towards content-based bit rate allocation

An adaptive motion-compensated video coding scheme, that is based on struct ural video component segmentation and coding complexity analysis, is propos ed in this paper. The bits are allocated more efficiently among different f rame types and variant video components. A novel scene cut detection algori thm is proposed for partitioning the input video sequences into a set of sh ots and each shot may be encoded as one or multiple GOPs according to its l ength. Moreover, the positions of the reference frames (I and P frames) in a video shot are adapted to improve the temporal predictability among frame s and provide high coding efficiency, thus high picture quality with the sa me bit rate. More bits are allocated for these reference frames for providi ng high quality of the reconstructed pictures. The residue frames in a vide o shot are encoded as the bidirectional interpolation frames (B frames) and can be also quantized more coarsely because they have high temporal predic tability and are not used as references. The bits, that have been allocated for the three different frame types (I, P, B frames), can be further distr ibuted more efficiently among variant video components to avoid the coding artifacts. Experimental results show that this proposed adaptive video codi ng scheme is more efficient than the traditional fixed GOP coding algorithm s and may be an efficient development of the present adaptive coding techni ques. (C) 2000 SPIE and IS&T. [S1017-9909(00)00504-3].