The Research of Digital Watermarking Based on Fractional Order Hyperchaotic System and DWT
Lin Ta · Jiguang zazhi · 2015
In order to improve the effect of digital watermarking encryption based on integer order low- dimensional chaotic system,a method including fractional order hyperchaotic system to encrypt digital watermarking image and discrete wavelet transform to embed and extract encrypted watermarking is proposed in this paper. Firstly,chaotic sequences of fractional order Liu hyperchaotic system by preliminary estimate and correction method are generated for chaotic scrambling transformation and pixel values spread encryption to plaintext watermarking,and then encrypted watermarking is embedded and extracted by decomposition and reconstruction to host image and encrypted watermarking using of discrete wavelet transform. Finally,initial value and order sensitivity for watermarking encryption system are verified,and attacks of pixels damage and JPEG compression to watermarked host image are tested. Experiments show that,with digital watermarking method based on fractional order hyperchaotic system and discrete wavelet transform,encryption and decryption,anti- attacks of pixels damage and JPEG compression perform well.