Abstract
This paper deals with some modifications of fractal image coding algorithms and implementation of digital watermarking in fractal image coding. The paper focuses on two approaches of fractal image coding: approximation based on linear polynomials with iterative decoding and approximation based on trigonometric polynomials with non-iterative decoding. The modifications in coding and decoding algorithm to get better quality of reconstructed image are presented too. More over three possible approaches of embedding digital watermarks into fractal code of images: embedding digital watermarks into coeflicients of block similarity, into parameters for position of similar blocks and into parameters for isometric transformation are proposed. The algorithms were analysed and verified on gray scale still images.
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