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watermarking technique and its applications security
The use of numerical methods to integrate hidden in images, sounds, documents, books, videos and other digital products, to achieve the objective of the existence of hidden messages.
HC screen Special Indian Network Digital Watermarking (watermarking) technologies in recent years, the rise of the international community of information Security as subjects of advanced research, is close to the practical application of information hiding. Tattooing Digital (Digitalwatermarking) technology in recent years the rise of the international information security as research subjects peak is close to the practical application of information hiding. With information security, information hiding, data encryption Dengjun close.
watermarking algorithm using tags which have special meanings (watermark) using numerical methods to integrate hidden in images, sounds, documents, books, videos and other digital products, to achieve Objective of the existence of hidden message, using the interests of the owner to prove ownership of their works, and the identification, prosecution of illegal violation of the evidence, while the watermark detection and analysis of reliability to ensure the integrity digital information, making intellectual property protection and security digital multimedia and effective means of protection IP, confidentiality and communicate content identification fields have a wide range of applications.
A watermark of the main components
digital watermark in theory, based on rapid development in recent years, analysis wavelet (WaveletAnalysis). Digital watermarking technology has great strength to be seen, hidden place of safety, no ambiguity, and the calculation of the efficiency and so on. Watermark embedding and extraction system is divided into two parts, each part of it by the software and hardware. This form of composition
effectively improve the level of anti-counterfeiting technology, which greatly increases the difficulty of counterfeiting and counterfeiters. Following features:
(1) as an identifier of digital watermark is not visible in the form of visual products hide printing, natural light or artificial light irradiation, the naked eye can not distinguish whether to add a digital watermark printed marks and does not need to protect the print (watermark bunker), the original image visual senses, as a computer or computer device for reading machine can be determined.
(2) print the watermark is hidden in the tag not only a place at random can be arbitrary, so that printing has played a role in multiple security.
(3) print the watermark hidden in the tag does not change after the printing location, handling personnel and the time change in above link does not leak and the possibility of proliferation.
(4) to embed watermark printed tag does not change the appearance properties of original print, not printing equipment being special needs, without changing the printed material, but not to increase the printing costs.
The basis of modern security technology, trends, printed mark in the method Digital watermark detection using DSP chips and random access memory with machine readable identification. This high performance Machine readable identification devices are readily mass production, and good product consistency, low cost, simple operation to use, reliably determine the authenticity of the software product to run fast, safe and good, fast updates and so on.
Second, based digital watermarking technology
1, wavelet-based Generation and hidden digital watermarking Algorithm: The algorithm of wavelet the digital image data space by discrete wavelet transform (DWT) in the wavelet coefficients, and the type of information to be hidden, proper coding and its deformation, and then hide the amount of information depending on the size and the corresponding security objectives, choose instead of frequency domain coefficient sequence.
Finally, the digital image of the frequency domain coefficients by the transform reverse in the space of data.
2, a watermark technology copy protection: When counterfeiters get with the digital watermark printing and packaging, he will surely try to copy (such as high precision digital scanner), to prevent digital watermark information is copied, the watermark hidden digital watermark information embedded software using the equivalent of chromatography for a given algorithm, this method can not guarantee counterfeiting in the adjustment process to respond to the color of the original image, you can not avoid the equivalent change chromatography, so fundamental to ensure the watermark will not be copied.
3, anti-fading technology: from digital images for printing, go through the plate making, printing processes such as multi-channel digital watermark on the characteristics of each process must be mitigated to ensure the final print watermarks have enough signal strength, digital watermark embedding information implicit in the software generated fully considered sufficient signal strength to ensure that, through a number of processes when signal strength (strength) may still be a reliable machine readable.
4, machine-readable digital watermark test: the test machine-readable digital watermark technology eliminates the uncertainty of human factors to improve test speed and improve hidden information (watermark) to identify security, and RFID can, UV, magnetic tape and other equipment inspection Security was composed of mature security system multi-dimensional, to improve the level of integrated security.
To develop a low cost, mass production can be industrialized as detector material type machine-readable digital watermark inspection machine reading devices must be used embedded operating system (Vix / Vox), with DSP chip as the processor core using the apparatus CMOS camera and the formation of surface (CCD) image sensor devices to form a portable and mobile, AC and DC, can be networked, the software can quickly update detection equipment in digital security.
Attention to innovation business process management change to find new ideas? Command the 2010 special screen printing industry of China Development Forum
"Zhen Xing Cup 2009 China Top Ten selection screen printing Special Awards
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