A Robust Watermarking Technique for Copyright Protection Using Discrete Wavelet Transform

The arrival of digital world coming soon, the digital media content can be easily altered, duplicated, and spread, which causes the copyright of media are violated. Therefore, attention is to discuss the protection of the intellectual property (IP) rights of digital media. Then, the digital watermarking can be a simple and effective approach to provide copyright protection of IP. In this study, a method of robustness and blind extraction watermark for static images is proposed. It utilizes discrete wavelet transform and applies three coding methods according to the different characteristics of band coefficients: lattice code based on the communication principle, modification of insignificant coefficients based on the just-noticeable distortion of the human visual model, and quantization index modulation based on singular value decomposition. Together, these methods embed a watermark while maintaining image fidelity. From our experimental results in this study, all of them can indicate that the proposed approach is high robust against frequency-based and time domain geometric attacks. Additionally, since our approach produces a blind watermark and thus neither the original image nor any of its related information is needed, it is a very convenient and practical watermarking technique for applications.