Research And Implementation Of The Digital Watermarking Based On DWT

Digital watermarking technology,as an important branch of the information hiding,has attracted widely attention of the academic circles.At the same time,the digital watermarking technology will become an important part of the security printing technology surely in the future because of it’s excellent performance in image security aspects. At present,digital watermarking that is invisibility and robustness has gradually become a research focus.This paper has studied a wavelet domain digital watermark for color image based on the Arnold scrambling transform and singular value decomposition(SVD). This article first analyzed the research background, research status at home and abroad, the research goal and the significance of the digital watermarking technology established the research content and direction.Then through the research of the basic theoretical model of digital watermarking,the wavelet transform theory of digital image,Arnold scrambling transformation theory of digital image,singular value decomposition of digital image, put forward a new method of digital watermarking embedding and extraction algorithm of color images in wavelet domain,digital watermark embedding and extraction code was wrote based on this algorithm,and the watermark embedding and extraction experiment was done in MATLAB2010 simulation platform.Among them,after the embedding of watermark information,two image’s difference would be evaluated from objective and subjective respect to verify whether the algorithm has good invisibility;before the extraction of the watermark information, variety of geometric and algorithm attack experiment would be put to the image which contain watermark information in order to verify whether the watermarking algorithm has good robustness.Finally, according to the algorithm,a digital watermark embedded system software was designed preliminary.The experimental results showed that,there’s no visual difference between the watermarked image and original host image,the peak signal to noise ratio is high between two images,which shows that the algorithm has good invisibility;the watermark image still could be extracted from watermarked image which’s attacked after shearing, rotation, noise addition, JPEG compression even print scan and other forms of attack,that showed the watermarking algorithm had good robustness.According to the experimental results, an initial interface design for digital watermarking system was desidned by GUI interface design tool of MATLAB, and it could be used directly to embed watermark information to the color digital image.