Image Watermarking Techniques And Algorithm Based On Wavelet Transform

Multimedia storage and transmission technology, for information visit provided a great convenience, with the computer communications technology is developing rapidly, and the digital scanner and printer to make extensive use of digital multimedia data access, exchange and transmission becomes extremely simple, digital multimedia information dissemination more efficient. But there is a clear side-effect: the illicit distribution of multimedia data and very easy to copy, but the quality is not jeopardized. For multimedia creators and the issue of copyright, intellectual property protection has become one of the most urgent tasks. And the protection of property rights in the traditional cryptography, has its own deficiencies. Cryptography is sent by the general approach to data encryption to protect digital content before, the key given only to those legitimate users. Although pirates receive encrypted documents, but without the right key, the document is useless. But regret is that, with a computer handling capability to rapidly improve, this method becomes increasingly unsafe, on the other hand which the encrypted data content in decoders later that it was put completely decoders under the control of, in fact pirated also completely through legitimate means become legitimate users, obtained data content after recording and issuers pirated material, originality the author no way of tracking the entries to the complicated system and transmitting no effective means to ensure that it is not from unauthorized copying, once again dissemination and of Copyright, in other words, cryptography can only protect transmission the data in information while data content Once has been decoded will no longer be a protective role. Therefore, there is an urgent need for an alternative technology or cryptography added to the technique, which should be decoded in the data content can continue to protect the data content.Information Hiding in the origin of the digital watermarking technique for the realization of effective intellectual property protection provides a new way of thinking that in recent years has become a hot issue in the field of information security research. With the development of society, the increasing demands of the watermark, the watermark embedding algorithm based on wavelet transform everyone's accreditation. This paper introduces the basic information hiding and digital watermarking technology and the concept of digital watermarking main application areas, properties, andintroduces some of the current models based on the frequency-domain algorithms. And on this basis, to improve a digital watermarking algorithm based on wavelet transform, the method chosen by the band had little effect on the visual image for the embedded watermark, the embedded watermark image better transparency; And the watermark image of the original image were different levels of the wavelet transform, adaptive wavelet important factor to be selected the original image, image watermark embedded into wavelet coefficients in a certain way, has a good sound and image compression resistance; Experimental results show that the method is effective and feasible.