A Robust Public Watermarking Scheme Based on DWT

Watermarking is a simple and effective method that is frequently used to protect the copyright of an image. However, watermarks must be strong enough to resist various attacks. In this paper, two-level Discrete Wavelet Transform (DWT) and a trusted third party are applied to ensure the robustness of the watermarks and protect the copyright of an image. The experimental results showed that our proposed scheme can resist various attacks successfully, such as JPEG compression attacks, filtering attacks, and sharpening attacks. Consequently, our scheme is a method that ensures the robustness of the watermark and protects the copyright of a grayscale image.