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This paper presents an anti-geometric attacks algorithm of color image watermarking based on the scale-invariant feature transformation (SIFT). Firstly, the method detects SIFT feature points in the red component of a true color image and filters out the feature points information. Then three-level Discrete Integer Wavelet Transform (DIWT) is performed on the blue and green component of the color image to extract the low-frequency component coefficient. Finally, a binary watermark which has been scrambled is embedded in the low-frequency wavelet coefficients of the blue component. The simulation results show that the algorithm is robust against signal processing and geometric attacks

A blind digital watermark technique for color image based on integer wavelet transform and SIFT