摘要
数字图像水印技术是一种信息隐藏技术。针对信息隐藏对于秘密信息隐匿性和可靠性传输的高要求,采用LDPC编码调制的不等差错保护(LDPC-CM-UEP)方案应用于数字图像水印技术中,将水印信息经过LDPC编码后的码字分为两部分,分别利用两种QAM高效调制方式,使水印信息作为重要比特得到很好的保护。仿真结果表明该方案在保证水印鲁棒性和隐匿性的前提下,提高了系统的频带利用率,从而改善了数字图像水印系统的传输质量。
Digital image watermarking technology is a kind of information hiding technology. Due to high demand of secretiveness and reliable transmission for the secret message in information hiding technology, the paper adopts the unequal error protection of LDPC coding modulation （LDPC-CM-UEP） scheme for applying to digital image watermarking technology, the codewords into which the watermark information is encoded by LDPC code to generate are divided into two parts. The two parts respectively make use of two different QAM high-efficient modulation modes, so that the watermark information as an important bit gets very strong protection. The simulation results show that this scheme could improve the spectrum utilization rate of the system on the premise of guaranteeing robustness and invisibility of the watevmarking, thus im proving the transmission quality of digital image watermarking system.
出处
《通信技术》
2014年第4期445-449,共5页
Communications Technology
基金
山东科技攻关计划项目(No.2012J0030009)~~
关键词
LDPC码
数字图像水印
编码调制
不等差错保护
：LDPC code
digital image watermark
coding modulation
unequal error protection
