A NEW HYBRID PREDICTIVE TECHNIQUE FOR LOSSLESS DATA COMPRESSION

摘要

A new hybrid predictive coding scheme for lossless data compression is introduced and studied here. The proposed scheme attempts to improve the compression performance of a conventional adaptive predictive coder by incorporating three levels of prediction. The first level estimates and removes a time-varying mean signal. The second level uses DFT and IDFT to estimate and remove the predictable high frequency subband component of the signal, whereas the third level performs the adaptive predictive coding of the smoothed signal. Experimental results based on a group of test signals seem to indicate that the proposed hybrid scheme can significantly improve the lossless compression achievable using a conventional adaptive predictive coder.