In this method, a grayscale watermark was added to the highest frequency subband of the host image.
Based on the method, a dual watermarking implementation was proposed in the DWT domain, where watermark embedding was carried out on the insensitive wavelet coefficients determined by the modified HVM.
Experimental results have shown that the proposed method can design a watermark with desirable semi-fragileness that works well on different types of mobile phone displays.
To protect customers' rights and to identify the users of unauthorized copies, the fingerprinting technique is a feasible method for embedding a watermark so that content owners can identify users who have purchased the right to use the content and users who have not purchased this right.
According to (1), we designed a watermark method which can change the embedding intensity.
Given a legitimately watermarked image, (A^w), and an unwatermarked target image, (A^t), this method begins by applying a watermark removal attack to (A^w) to obtain an approximation of the original image, (tilde{A}).
The techniques developed in this contest led to general methods for reverse-engineering a watermark algorithm via experimental images fed to its detector.
In the first method, the watermark consists of an arbitrary nonstationary signal with a particular signature in the time-frequency plane.
For the first method, the watermark is chosen as an arbitrary nonstationary signal with a particular signature in the time-frequency plane.
We have proposed a watermarking method warranting the lower limit of the image quality of watermarked images.
