Novel object-oriented video coder employing correlation-maximizing extrapolation

Abstract

In this paper, the performance of the extrapolation block transform (EBT) and the shape-adaptive DCT (SA-DCT) for arbitrarily shaped image segment coding is theoretically compared. The comparison indicates that the EBT approach yields better performance than the SA-DCT on the highly correlated image at low bit rates. Since the correlation maximizing extrapolation (CME) algorithm proposed in maximizes the correlation of the extrapolated block, it is considered to be one of the EBT techniques that can achieve the performance expected by the theoretical performance. Thus, a novel object-oriented video coder employing the CME algorithm for the texture coding is proposed in this paper, and its performance is compared with that of the MPEG-4 VM through intensive computer simulations. In the proposed video coder, the contour coding technique employing the two- stage motion compensation is adopted for the shape coding, and the rate-constrained hierarchical grid interpolation is adopted for the object-based motion compensation. The simulation results show that the proposed coder outperforms the MPEG-4 VM by about 0.84 approximately 1.29 dB depending on the test sequences at the same bit rate.