K. Belloulata, A. Baskurt, R. Prost. Fast directional fractal coding of subbands using decision-directed clustering for block classification. In Proceedings of ICASSP-1997 IEEE International Conference on Acoustics, Speech and Signal Processing, Munich, 1997.
We propose a new image compression scheme based on fractal coding of a wavelet transform coefficients using a fast non-iterative algorithm for the codebook generation. The original image is first decomposed into subbands containing information in different spatial diractions and different scales, using an orthogonal wavelet filter bank. Subbands are encoded using Local Iterated Function Systems (LIFS) with range and domain blocks presenting horizontal or vertical directionalities. Their sizes are estimated according to the correlation lengths and resolution of each subband. the computational complexity is greatly decreased by using subband decomposition. In addition a fast non-iterative algorithm is implemented for the blocks classification. This algorithm creates progressively the codebook during only one scanning of the training set. We proves the efficiency of the proposed approach both in terms of PSNR/bit rate and computation time.
@InProceedings{BeBaPr97a,
Author = {Belloulata, K. and Baskurt, A. and Prost, R.},
Title = {Fast directional fractal coding of subbands using decision-directed clustering for block classification},
BookTitle = {Proceedings of ICASSP-1997 IEEE International Conference on Acoustics, Speech and Signal Processing},
Address = {Munich},
Year = {1997}
}