Saturation Adjustment Scheme of Blind Color Watermarking for Secret Text Hiding

Abstract

This paper presents a novel secret text hiding technique, where the secret text is embedded into the low frequency sub-band of the saturation component of a color image via redundant discrete wavelet transform (RDWT), while the intensity and hue components are preserved with direct saturation adjustment. The hidden secret text can be extracted from the watermarked image based on independent component analysis (ICA) without referring to the original cover image. Experimental results demonstrate that our scheme successfully fulfills the requirement of imperceptibility and provides sufficient robustness to against the most prominent attacks, such as JPEG2000, JPEG-loss compression, low-pass filtering, scaling, and cropping.