Motion-compensated subband coding with scene adaptivity
Jungwoo Lee, Bradley W. Dickinson · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1994
This paper presents a new motion compensated subband video coding algorithm with scene adaptive motion interpolation. The work builds on temporal segmentation for determining the reference frame positions, and multi-resolution motion estimation in the subband domain. In the proposed approach, the reference frames for motion estimation are adaptively selected using the temporal segmentation of the lowest spatial subband. Motion compensation is used after subband filtering because it produces better performance than subband filtering after motion compensation. The proposed scene adaptive scheme, temporally adaptive motion interpolation (TAMI), determines the number and the positions of the reference frames for motion estimation using two types of temporal segmentation algorithms. The input video is split into the 7 spatial subbands by using a pair of low-pass and high-pass biorthogonal filters, and the TAMI algorithm is applied on the lowest of the subbands. Motion vectors for each subband are generated by a hierarchical motion estimation approach. Block-wise DPCM and a uniform quantizer are used only for the lowest subband of an intra frame, and all the other subbands are coded by PCM with a dead-zone quantizer. Simulation results show that the scene adaptive scheme compares favorably with the fixed interpolation structure.