Digital Watermarking Algorithm Research and Implementation based on Matlab
Abstract
The basic idea of digital watermarking in the original media data, such as audio, video, images and so on, to hide a certain significance as a marker of additional information, the information and raw data are closely linked together and then transfer. At the receiving end, the computer signals are extracted watermark for various purposes, possible applications include digital signatures, digital fingerprints, broadcast monitoring, content authentication, copy control and secret communications. The main task of this paper is a digital watermark image signal, the process is the first image signal by adding a watermark information, the next to detect digital watermark information extraction, the final image of the embedded watermark different attacks, the test of robust watermark sexual. The entire process is run through the realization of Matlab software.
And encryption technologies, digital watermarking technology and will not prevent the occurrence of piracy, but by detecting in the digital carrier to add a unique mark, that is extracted from the watermark data to be protected in order to monitor the spread of the authenticity of identification data to resolve the copyright dispute and provide evidence for the court. Due to the number of entries is carried out under a state of non-encrypted transmission, as the watermark information is usually not visible (Invisible) or non-detect (Imperceptible), but through a number of algorithms can be detected or extracted.
Digital watermarking technology is done through micro-media data modified to embed watermark information, so as to achieve the purpose of information hiding. The process does not affect the normal use of the original data, the amount of data does not change the size of the original, do not change the appearance of the media. The technology in military communications, the national information security, digital networks, the field of multimedia and print publishing are very broad application prospects.
Keywords: Digital watermarking; Matlab; Information Hiding; Frequency domain method; Robustness;
