Motion-compensated temporal filtering based on the DCT

Motion-compensated temporal filtering (MCTF) based lifting implementations of various discrete wavelet transforms have recently gained a lot of interest due to their good performance in energy compaction and their ability to provide various scalability features. Although all the existing MCTF schemes are based on the wavelet transform, in this paper, we propose a temporal filter framework based on the discrete cosine transform (DCT) which is an extension of our motion compensated DCT temporal filter (MCDCT-TF). In the current work, in addition to the two-band and three-band temporal decomposition structures employed in the MCDCT-TF technique, a longer tap filter (5/3 DCT) is utilized to improve the compression gain further. Simulation results show that a three-dimensional hybrid 3D subband/DCT codec with longer tap DCT filters yields a significant improvement over our earlier 3/2 MCDCT-TF, Haar, and 5/3 wavelet filters.