||Kopilovic, I., Saupe, D., Hamzaoui, R.
||Progressive fractal coding
||Progressive coding is an important feature of compression schemes.
Wavelet coders are well suited for this purpose because the wavelet
coefficients can be naturally ordered according to decreasing importance.
Progressive fractal coding is feasible, but it was proposed
only for hybrid fractal-wavelet schemes. We introduce a
progressive fractal image coder in the spatial domain. A Lagrange
optimization based on rate-distortion performance estimates determines
an optimal ordering of the code bits. The optimality is in
the sense that the reconstruction error is monotonically decreasing
and minimum at intermediate rates. The decoder recovers this
ordering without side information. As a side effect, our work motivates
improved bit allocation strategies for fractal coding.