基于QR码和量化DCT的遥感影像数字水印算法

A Digital Watermarking Algorithm Based on QR Code and Quantization DCT for Remote Sensing Image

利用快速响应矩阵码(QR Code)生成原理和强自纠错特性的技术优势,提出了一种基于QR码和量化DCT的遥感影像数字水印算法。首先,将原始水印信息生成QR码并对其进行预处理,保存QR码的数据编码和纠错编码,同时将数据编码和特征水印结合生成待嵌入的水印信息;然后对载体遥感影像进行8×8分块DCT,根据量化规则将水印信息嵌入到载体遥感影像DCT域的直流系数中;最后,对所提算法进行验证。实验结果表明,该算法不仅降低了嵌入数据量,而且能够抵抗裁剪、压缩、噪声、滤波等常规攻击以及复合攻击,具有较强的鲁棒性和实用性。

Considering the generating principle and the advantage of strong self-correcting ability of QR Code,in this paper,a digital watermarking algorithm for remote sensing image based on QR Code and quantization DCT（Discrete Cosine Transform）was proposed.Firstly,the QR Code was generated by original copyright information.After QR Code pretreatment,the data code and error correction code were saved.In the meantime,the data code and feature watermark were combined and used as watermark information.Then,the remote sensing image was transformed into 8×8 blocks through DCT,and watermark information was embedded into the low frequency coefficients of DCT according to the quantization rule.Finally,the proposed algorithm was experimentally verified.Results showed that the proposed algorithm was robust against common attacks and composite attacks,such as cutting attack,compression attack and so on,and it could also reduce the watermark size sharply.