基于FPGA的数字图像水印实时嵌入系统的设计与实现

Design and implementation of digital image watermark real-time embedded system based on FPGA

数字水印技术作为版权保护及真实性认证的重要手段越来越受到人们的关注。通常采用软件方法实现水印算法,但这种方法的实时性和安全性都不够理想。本文设计的硬件平台由Atlera公司提供的EP2C70F896C6型号的FPGA芯片和CMOS摄像头组成,该平台采用VerilogHDL硬件描述语言实现DCT2算法及IDCT2算法,同时采用FIFO技术解决了系统各部分的时序问题。实验结果表明:对不同光线强度下采集到的图像均可实现水印的盲检测,并对篡改有良好的定位能力。

As a mean of intellectual property protection and certificate of authenticity, digital watermarking has drawn more and more attention. Generally, watermarking algorithm is realized by the mean of software. However, it is not perfect in real-time and safety, a hardware system consisting of a kind of EP2C70F896C6 FPGA produced by Altera company and a CMOS camera head. The DCT and IDCT2 algorithms are realized by the Verilog HDL. an FIFO technology is applied to solve the time sequence logic problem between two parts of the system, experimental results show that digital watermarking of the image captured in all kinds of light intensity can be extracted without the original image, and the position of the changing parts is located precisely.