On the Adaptive 3 - Dimensional Transform Coding

In this paper, based on the 3-dimensional discrete cosine transform(DCT) for removing the temporal correlation, an adaptive 3-D transform coding technique is proposed. Because of the nonstationary nature of the image data, the energy distribution in a 3-D DCT block varies along the vertical, horizontal and temporal directions. Thus, adaptive schemes, such as the 3-D classiication, the classiied linear scanning technique and the VLC table selection scheme, are used to take into account of local variations. Also, in our approach, a hybrid technique, which adap-tively combines relatively simple inter-frame coding with intra-frame coding, is presented. Through intensive computer simulations, the performance of the proposed 1 The authors are with Signal Processing Lab.,