High Performance Erasable Watermark Based On Integer Wavelet Transform

In recent years，Change with each passing day of the Internet Technology，Thedigitization and networks of information provide convenience into access and query forinformation.It has become easier to download、copy、transmit digital works, Somequestion following, the originality or special signficance of information which Theoriginality picture of personal、the confidential of company、Government confidential,isvulnerable to attacks and illegaliy tampering,so as to,It had a great impact on the healthydevelopment of the modern information industry.So in today’s Internet technologydevelopment,it is an important issue to certification and protection of digital products onthe network.Cryptography is one of the more mature important tradition technology which isused to protect the security of digital information,That is: The use of encryption toprotect the information,If the attacker accessed the encrypted information where in thetransmission process, the attacker can not obtain the original information. So as to reachthe purpose of copyright authentication and information protection.The informationwhich encrypted is easily lead to illegal attacker’s attention;Especially,In this opennetwork world,because of the incomprehensible of the encrypted information,lead to arange of cryptographic techniques problem can not be resolved,for example,the spreadof digital information. the emergence of digital watermarking technology can solve theproblems which cryptographic techniques can not be resolved.Digital watermarkingtechnology is a new technology which copyright protecion and copyright certification ofdigital products,and the integrity and the source of certification in open networkenvironment.Erasable digital watermarking technology which to embed informationwhich does not affect the use of digital products, When the question of copyright ofdigital products or need to query the source of digital products,the embeddedinformation can be erased,and the ability to restore digital undifferentiatedproducts.Because the image is very important digital products on the Internet,the studyof image has a very important significance.In this dissertation, It has proposed a high capacity erasable digital watermarkingalgorithm which is based on predicting error expansion and secondary scalable. In orderto reduce the predicition error expansion brought the defects which excessively modifythe pixel values,and over a single embedding.we select the embedding program whichthe triangle predictor to predict the pixel value. use Secondary scalable way to reducethe loss of the embedding capacity, According to no-expand distribution list to statistic the pixel which can be embedded the information and the quadratic expansion of theinformation. In the extraction side, the last pixel is very important to successfullyextract. In the extraction process,According to Part of the second extended informationto restore the overall secondary extended information, The experimental results showthat the algorithm embedded in the capacity limit for1bpp, With dense images of betterquality.