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Static image watermarking processing in the FPGA - based implementation

Author: LiuGuoHe
Tutor: LaiHua
School: Kunming University of Science and Technology
Course: Measuring Technology and Instruments
Keywords: DCT Digital Watermarking FPGA SOPC
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 96
Quote: 2
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Abstract


In recent years, with the development of multimedia processing technology and network technology, more and more digital products on the network easily publish, disseminate. Multimedia processing software, digital media (digital audio, text, image, and video) original the unrestricted edit, modify. Digital product of the original is difficult to be assured, the question of the authenticity of digital products has attracted widespread attention. Digital watermarking technology (Digital Watermarking) security information embedded in the case does not affect the normal use of the original data, and the information can not easily be removed, wherein the information only watermark extraction algorithm can be detected by dedicated. Digital watermarking as an effective way to protect digital media information security, and in recent years has aroused great interest and attention. Therefore, the digital watermarking technology as an effective means to identify the authenticity of the digital product, became the focus of the multimedia information security research. With the rapid increase of the integrated circuit manufacturing technology, FPGA (Field Programmable Gata Array) chip integration and processing capabilities have been greatly improved, so that the FPGA can achieve complex circuit functions, and processing speed can meet The large part of the user's requirements. In this paper, a FPGA circuit programmable features, design and watermarking of digital image processing system. The digital watermarking system in this article is a watermark embedded in the DCT domain, the first sub-block processing on the digital image, and then select the DCT high frequency coefficients as part of the watermark information carrier. The design of the hardware part is responsible for the two-dimensional discrete cosine transformation (DCT2) and two-dimensional inverse discrete cosine transform (IDCT2) achieved, This can be complex operations cross hardware circuit to achieve greatly improved the operation speed; this design The software part responsible for the digital watermark information embedded SD card read and write, so that you can shorten the development cycle and provides a convenient system debugging and algorithm improvements. This article briefly describes the development status and future direction of digital watermarking technology and FPGA technology the typical digital watermarking algorithm and its applications. Combined with existing digital watermarking algorithm and analyze its shortcomings, a new algorithm, this algorithm is compared with the existing algorithm has been greatly improved in the digital watermark invisibility. System hardware architecture programmable system-on-chip (SOPC) design and development process, and discusses in detail the modular structure of the system's hardware and compared this structure with traditional software in computing speed advantage through data . The system software architecture, and the part of the function of the digital watermark information embedding process. Finally, through the analysis of a large number of experimental data to adjust the parameters in order to get the best results.

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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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