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The Research on Digital Watermark Image Authentication Technology

Author: HuangLiangYong
Tutor: XiaoDeGui
School: Hunan University
Course: Applied Computer Technology
Keywords: Authentication watermark ( Semi- ) fragile watermark Chaotic Mapping JPEG compression
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 157
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Abstract


Digital watermarking is an important branch of information hiding technology research areas. Copyright protection of digital multimedia information, many papers have elaborated certification of the authenticity of the information content, and the integrity of the certification of the image in recent years with the development of network technology to generate and develop urgent market demand has attracted a large number of researchers and a wide range of application prospects into the ranks to become the hot spot of the current area of ??certification. For (semi-) fragile watermarking technology is still in its infancy in the theoretical and practical results are far less robust watermarking technology is so mature, there are still many problems need to be to continue to study and explore. This paper studies digital watermark is an important branch of - Image authentication watermark: discusses the the authentication watermark background, the basic theory and techniques; and analyzed existing fragile watermarking and semi-fragile watermarking algorithm and compare their advantages and disadvantages, in based on improvements and proposes three authentication scheme. For the existing airspace fragile Authentication Watermarking positioning accuracy and security issues, a chaotic fragile watermarking algorithm for image tamper detection and precise positioning. Algorithm to the original image size of 2 × 2 block, calculated for each pixel in the image block 6 bit gray average (accurate to two decimal points) as the watermark information. Logistic chaotic binary sequence to determine the position and encryption of the embedded watermark bits, the the authentication watermark information is embedded into the least significant bits of each pixel point 2bits. The experimental results show that this algorithm on the occurrence of tampering can be completely detected and precise positioning, which can effectively resist the vector quantization attack. Is proposed based on Arnold's best scrambling degree watermark scrambling algorithm, the watermark of the the above airspace fragile authentication watermark algorithm scrambling the watermark information under the control of the key showing the white noise characteristics similar to the uniform distribution. Does not require the original image in the image detection authentication, tamper detection can be achieved and the approximate recovery, the experimental results show that the algorithm is simple, safe, and has good practicality. Semi-fragile watermarking algorithm proposed combination of a DWT domain and DCT domain for JPEG compression. First, the steady-state characteristics of DWT to extract the original image and mapped into the watermark, to generate a chaotic sequence in a key under the control watermark encryption; then the DCT transform on the original image, using the principle of pre-quantization in the JPEG compression, the watermark is embedded into the the quantized DC coefficients of the DCT; Finally, the inverse quantization and inverse DCT transform to obtain a watermarked image. Experimental results show that the algorithm is applied to the image content authentication, not only can distinguish normal compression and tampering, but also can be tampered with accurate positioning, JPEG compression has better robustness.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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