Watermarking using similarities based on fractal codification

Authors:
Pedro Aaron Hernandez-Avalos;Claudia Feregrino-Uribe;Rene Cumplido
Affiliations:
Department of Computer Science, National Institute for Astrophysics, Optics and Electronics, Luis Enrique Erro No. 1, C.P. 72840, Sta. Maria Tonantzintla, Puebla, Mexico;Department of Computer Science, National Institute for Astrophysics, Optics and Electronics, Luis Enrique Erro No. 1, C.P. 72840, Sta. Maria Tonantzintla, Puebla, Mexico;Department of Computer Science, National Institute for Astrophysics, Optics and Electronics, Luis Enrique Erro No. 1, C.P. 72840, Sta. Maria Tonantzintla, Puebla, Mexico
Venue:
Digital Signal Processing
Year:
2012

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Abstract

This paper describes a digital watermarking scheme based on fractal codification for 8-bit gray scale images; it replaces range blocks by modified blocks according to the watermark bit being embedded. The main contribution of this work is a decrease in the distortion generated by the watermark embedding in the carrier image compared to the reference scheme based on fractal codification; in addition, the scheme achieves a better robustness against JPEG attacks, a decrease at 13.2 dB in distortion and up to 50% improvement in Bit Correct Ratio (BCR). The scheme relies on the selection of interest points, local searching regions and embedding regions to be successful. Finally, this document presents a comparison of the results obtained with the proposed scheme and other schemes inspired by the fractal codification.