A Robust Watermarking Technique for Still Image Using Compression Concept and Coefficient Difference

Abstract

In this paper, a robust watermarking technique for embedding a watermark into gray level image is proposed. The watermark is designed to be extracted without the original image so that the application is more feasible in practice. It is well-known that lossy compression will remove high frequency components of an image. By using the concept of compression to embed a watermark into the coefficients difference between the middle frequency of the original image and the compression one, the proposed scheme provides a robust characteristic and maintains good visual quality of an image. Experimental results show that the scheme not only meets the requirements of the imperceptibility and security, but also features the robustness against various image processing attacks.