关键词: 图像认证 混沌序列 离散小波变换

Abstract:

Based on the research of discrete wavelet transform（DWT） and chaotic sequences, a new algorithm based on the wavelet domain of semi-fragile watermar king is proposed. The algorithm uses the relations of wavelet coefficients as the watermarking information, and utilizes chaotic sequences to generate a key which encrypts the watermarking information, and watermarks are embedded into the low-frequency coefficients of the wavelet domain. The experimenta  l results demonstrate that the embedded watermarks are invisible,and this proposed watermarking algorithm is robust against many common attacks.

Key words: image authentication, chaotic sequence, DWT（Discrete Wavelet Transform）