Digital watermarking technology and its applications security

Posted on August 1, 2010, 11:12 pm

The use of numerical integration methods 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 (tattoo digital) technology in recent years the rise of international information security community as subjects of advanced research, is close to the practical application of information hiding. Digital watermarking (Digitalwatermarking) technology in recent years the rise of international information security community as subjects of advanced research, is very close to the practical application of information hiding. With information security to hide information, data encryption Dengjun close. The watermarking algorithm through some tags have a special meaning (watermark), using numerical integration methods hidden in images, sounds, documents, books, videos and other digital products, to achieve the objective of the existence of hidden message, using the interests of the owner to prove ownership of their works, and the identification, pursuit of illegal violation of the evidence, while the watermark detection and analysis of reliability to ensure the integrity of 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 digital watermark key composantesl’analyse digital watermarks in theory, based on rapid development in recent years wavelet (WaveletAnalysis) . watermarking technology is very robust to be seen, hidden place of safety, no ambiguity, and the computational efficiency and so on. Watermark embedding and extraction system is divided into two parts, each part of it by the software and hardware. This composition forms effectively improve the level of anti-counterfeiting technology, which greatly increases the difficulty of counterfeiting counterfeiting. Following features: (1) as a digital watermark identifier is not visible in the form of visual hide and printing products, natural light or artificial light irradiation, the naked eye can not distinguish whether Instead of adding a digital watermark printed marks and does not need to protect printing (bunker watermark), the original image of the visual senses, as by a computer or computerized machine reading device can determine . (2) print the watermark hidden in the tag is not just 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 the link above does not leak and the possibility of proliferation. (4) to embed a watermark printed tag does not alter the appearance of the properties 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 of detection of digital watermarks using DSP chips and random access memory with machine-readable identifier. This high performance aircraft machine-readable identification is easy to mass production, and good product consistency, low cost, simple operation to use, reliable, to determine the authenticity of the software to run fast, strong and good, quick updates and so on. Secondly, the basic technology numérique1 watermark, wavelet Generation and hidden digital watermarking algorithm: wavelet algorithm, the digital image data in space by discrete wavelet transform (DWT ) in the corresponding wavelet coefficients, and the type of information to be hidden, the appropriate coding and its deformation, and then hide the amount of information depending on the size and corresponding security objectives, choose the place of frequency domain coefficient sequence. Finally, the image digital frequency domain coefficients by the inverse transform in the spatial domain data. 2 watermark technology anti-copy: counterfeiters get when printing with digital watermark and packaging, he will surely try to copy (such as high precision digital scanner), to prevent the watermark information is copied, the watermark hidden digital watermark information embedded software using chromatography equivalent for an algorithm given, this method can not guarantee and piracy in the adjustment process to respond to the colors of the original image, you can not avoid a similar change chromatography, so fundamental to ensure the watermark will not be copied. 3 , anti-fading technology: from digital images for print, pass the plate, printing processes such as multi-channel digital watermark on the characteristics of each process must be mitigated to ensure the final print watermarks enough signal strength, digital watermark embedding watermark information in the software generated fully taken into account a signal strong enough to ensure that through a number of process when the signal strength (strength) may still be 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 the hidden information (watermark) to identify security, and RFID can, UV, magnetic tape and other equipment safety inspection system was composed of mature multidimensional security, to improve the security level integrated. To develop a low cost, mass production can be industrialized as detector material type machine-readable digital watermark inspection machine reading devices should be used embedded operating system (Vix / Vox), with chip DSP processor core using the CMOS camera and face training (CCD) image sensor devices to form a portable and mobile air conditioners, and DC, can be networked, the software can quickly update the detection equipment in digital security. Attention innovation business process change management to find new ideas?? Command’s 2010 special screen printing industry of China Development Forum “Zhen Xing Cup” 2009 China Top Ten selection screen printing special awards ceremony more interesting, please see>>