Digital Watermarking Method of Color Image Based on DCT and Combined with HVS
Yi Zhou · Computer Knowledge and Technology · 2009
This paper proposes a DCT-based color image watermarking algorithm,combined with HVS(Human Visual System) proposes a color image suited to the digital watermark embedding and extraction algorithm.According to human visual system,we can see that the human eye has not sensitivity to the blue component,so we embed the watermark information in the blue com-ponent to ensure the wa-termark invisibility.This paper uses a random sequence as a watermark signal,and embeds the watermark signal in the important compo-nents in the range of weight(the larger the amplitude factor of n as an important component) of the blue component which with discrete cosine transform,as a result of an important visual component is the main component of the image signal,image signal energy is concen-trated in majority of these components,the distor-tion in the images have a certain circumstances,can still retain the main component,that is an important visual component of the anti-interference ability stronger.Therefore,the watermark is embedded in the blue compo-nent of these important components,the robustness can be better,and defines a similar function to test the success of watermark extraction,the experiment results indicated the scheme has good invisibility and robustness to resist the normal attacks of adding noises、Gaussian filter-ing、compression,as well as rotating and clipping.