Research And Implementation Of Digital Image Watermarking Encryption Algorithm Based On FPGA

In recent years, digital watermark technique has developed rapidly, most of watermark algorithms enforce in the transform domain. Wavelet-based digital watermark technique can keep watermark invisible after embedding large data, while it is weak for geometric attacking. This article carried out a combination of the biorthogonal9/7wavelet and colored image watermarks encryption algorithms of SVD (singular value decomposition) on NIOS II Soft IP Core processor based on FPGA. This method was giving a system solution with the purpose of giving a good function and high invisibility, offering better robustness and safety for operations of common signals and geometric operations, and abilities of easily transporting and upgrading.This article mainly does work as follows:(1)Comparing with the first WT(wavelet transformation) which is often used in watermarking technology in transform domain, This article analyzed the function of improving wavelet, so it’s largely accelerated wavelet transform and rebuilt the original image in this paper.(2)The watermark algorithm proposed in this article disposed the low frequency information from the image after wavelet transform which is by S VD, and treated watermark information as Matrix Disturbance adding to diagonal matrix with a certain content. Because the SVD of the image matrix has a better robustness for geometric attacks such as cut, zoom, rotation, this algorithm considerably improved robustness of watermark technique in wavelet transform domain.(3)At present, most watermark algorithms are designed for grayscale images, while the encryption of watermark is more needed in the colored image in practical applications. The algorithm designed in this article is applicable for colored and grayscale images.(4)The pre-treatment of watermark information adopted the algorithm of knight-tour transform and Arnold scrambling. Through the integration of two algorithms, we the quantity of secret keys of data gets increased on the basis of pledging their ability of watermark image scrambling.The results showed that the algorithm effectively enhanced the strength and robustness of watermark on the basis of ensuring the invisibility of the watermark and enforced the blindness of detection.