Linear/nonlinear adaptive polyphase subband decomposition structures for image compression
Gerek, Ö. N.
Çetin, A. E.
IEEE International Conference on Acoustics, Speech and Signal Processing. Proceedings
Institute of Electrical and Electronics Engineers
1345 - 1348
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Subband decomposition techniques have been extensively used for data coding and analysis. In most filter banks, the goal is to obtain subsampled signals corresponding to different spectral bands of the original data. However, this approach leads to various artifacts in images containing text, subtitles, or sharp edges. In this paper, adaptive filter banks with perfect reconstruction property are presented for such images. The filters of the decomposition structure vary according to the nature of the signal. This leads to higher compression ratios for images containing subtitles compared to fixed filter banks. Simulation examples are presented.
Adaptive filter bank structure
Adaptive polyphase subband decomposition structures
Higher compression ratios