Title :
A rectification method for RST invariant digital image watermarking
Author :
Liu, Yan ; Zhao, Jiying
Author_Institution :
Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ont., Canada
Abstract :
Based on the log-polar mapping (LPM) and phase-only filtering method, this paper proposes a rectification method that can be used by any image watermarking algorithm to provide robustness against rotation, scaling and translation (RST) transformation. We obtain the RST parameters by calculating the cross-correlation between a template and the magnitude of the image in the corresponding domains. We compare the filter performance by three criteria. The detection accuracy for rotation and scaling is also presented.
Keywords :
correlation methods; watermarking; LPM; RST detection accuracy; RST invariant watermarking; RST robustness; digital image watermarking; geometric transform parameters; geometrically transformed image; image magnitude/template cross-correlation; log-polar mapping; phase-only filtering method; rotation transformation; scaling transformation; translation transformation; watermarking rectification method; AWGN; Digital images; Digital signal processing; Filtering; Fourier transforms; Information technology; Matched filters; Robustness; Signal processing algorithms; Watermarking;
Conference_Titel :
Electrical and Computer Engineering, 2004. Canadian Conference on
Print_ISBN :
0-7803-8253-6
DOI :
10.1109/CCECE.2004.1345085
