Image Blind Watermarking Algorithm And FPGA Implementation In DCT Domain

With the rapid development of multimedia technology, the digital image spread widely,but the piracy problem also becomes more prominent. Image watermarking technology is aneffective copyright protection and image authentication method, it is always added withsoftware. But software watermarking is slow, and the original image is easily stole, for theabove shortcomings, this paper attempts to add watermark by using FPGA.This paper focuses on a DCT domain image blind watermarking algorithm, modified bylow frequency coefficients of host image in DCT domain to embed the watermark. First usingthe Matlab7.6.0simulation, with a series of anti attack experiments, shows that: the algorithmhas good invisibility, and can effectively resist the noise, cropping, JPEG compression andother common image processing operations. After a good performance verification, thealgorithm is designed by using FPGA, in Quartus Ⅱ software using Verilog HDL to compilethe DCT transformation module and watermark embedding and extraction module, Withusing Modelsim software, shows that the logic circuit module design is correct.Using Altera ’s Cyclone Ⅱ chip to design algorithm platform, the platform contains thecore chip, acquisition and storage module, control module, display and transmission module,the design process of each module and the circuit diagram is given in this paper, debuggingthe algorithm after the hardware platform debugging, experiments prove that the scheme isfeasible.