Based Error Correction Coding Of Digital Watermarking Technology

Digital-watermarking technology is an effective technology for digital products'copyright protection and data security management, which set a special significant by some way to marker (watermarking) in the digital products for notifying copyrightThe digital watermarking algorithm based on frequency domain has great secure and robust, which becomes the main research direction. This article is focused on three types of watermarking algorithms:DCT transform, DWT transform, and DWT transform combined with DCT transform. The main research content and innovation are as follows:1. Described the background and significance of the digital watermarking's development, and briefly reviewed the recent relevant technology.2. Systematically introduced the basic concept of digital watermarking with the basic principles of discrete transform and wavelet transform. The basic process of the watermarking algorithm based on DCT and DWT are studied.3. Research on the basic principles of error-correction coding, and put forward a strategy that the watermark image can be encoded with Hamming(7,4) error-correction coding and that the encoded watermark image can be preprocessed with Arnold scrambling. Next, the watermark image could be embedded accorrding to blind watermarking algorithm of DCT transform, DWT transform, and DWT transform combined with DCT transform.The method of algorithm above is something that the watermark is quantified and embedded in the low frequency domain. All kinds of attack tests such as noise, cropping, filtering and JPEG compression prove that the algorithm achieved good anti-attack performance. Experimental results show that the algorithm has better security and robustness.