Research Of Color Image Watermark Technology Based On Wavelet Transform

With the rapid development of Internet technology, the spread of digital information has reached unprecedented speed, all sorts of traditional information are digital. Digital information has communication convenient natural advantage, but this advantage in greatly convenient also make counterfeit tamper with the spread of the growing diversity, image way to image property protection and content of authentication put forward a higher test【1】t. The ownership of the digital work, prevent tampering with problems, etc., are notable hot issue in network times. In fully enjoy the meanwhile, spread convenient means of how to use technology of the digital works copyright better protection, has become a wide range of research. Digital watermark is namely the subject research core technology. Digital watermarking technology can be applied in image, sound, video, etc. Various kinds of digital works, to protect the copyright of works【2】. The traditional encryption technology can protect, but once were declassified, originator it would be difficult to track their work and its have legitimate copyright. Digital watermarking technology arises at the historic moment, be implemented digital products copyright protection and information integrity verification effective means, has become one of the field of information security research hot spot.Digital watermarking technology is will additional information inlay the virgin material (hosts material) without affecting the host material availability information encryption technology, which can identify sex with additional information called digital watermarking, its form varied, such as text information, audio material, images, etc. Digital watermarking through information hiding technology, is host to material labeled a permanent copyright imprints, and concealed in which, no matter how to spread, digital watermarking information will not disappear, and can extract out【3】.Based on the study of the basic principle of digital watermarking technology on the basis of the traditional algorithm and of wavelet transform algorithm and color image watermark was studied, and the color images using BMP format, as a watermark is proposed based on wavelet transform digital watermark image with color and the detection algorithm. Mainly embodied in the following aspects:based on wavelet algorithm and the traditional discrete cosine algorithm, combining with the contrast of watermarking characteristic, and sums up more suitable for color image watermarking embedding and extracting the specific algorithm and steps. In order to validate algorithm maneuverability, carries on the noise, and use of MATLAB software attack is simulated. The simulation results show that the proposed algorithm is feasible, easy to realize not only to the original, and the watermark is good, and the concealment of the embedded watermark has excellent robustness, extracted watermark is easy to recogruze.In addition, aimed at most research, limited to digital watermarking robustness and concealment, this paper are studied of effectiveness. The so-called watermark effectiveness refers to watermark can effectively only mark the copyright owner, person to confuse copyright ownership links can be kind of means of watermark image in has again embedded forged belongs to its own copyright protection information, then this person on the work claimed he owns the copyright, this is the so-called "deadlock protection" t【4】. To solve this problem, this paper proposes "second embedded" concept. "Second embedded" refers to the attacker will its so-called watermark embed the watermark already contained owners in the image, so as to achieve the purpose of confusing ownership. This is the copyright protection of digital watermarking, the challenge for function of this problem, the paper made a "second embedded" research. Through different color before digital watermarking information embedded in a host of color image, and then try to extract the watermark, and proved by experiments, extraction of color image is still can identify, means that the effectiveness of digital watermark got very good practice, thus can also powerful solve problems of digital image property disputes, so it has great realistic significance.This article drew a conclusion and look to the future work.