Digital watermarking using DCT fractal coding without original image information

Abstract

This paper proposes a digital watermarking scheme based on fractal image coding with DCT coefficient and needs no information about the original image. In previous work, we have proposed the digital watermarking scheme based on fractal image coding with a DCT coefficient between the range block and domain block. That scheme had high tolerance for image processing in comparison with a conventional scheme. However, it had the problem that the information about the original image used for embedding data had to be preserved for every image. In the proposal, we choose two parameters in applying fractal encoder among the respective parts, denoted as the even and odd column, so that we can extract data without resorting to the original image. Numerical experiments have been performed in order to measure the validity of the proposal. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(4): 48– 55, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20432