一种无损的压缩视频图像信息隐藏方法(3)

附图：各种视频测试序列和对应的隐藏信息后视频帧，及其峰值信噪比PSNR(dB)、隐藏容量（Bit）；Q0=60。 a)隐秘通信应用算法 b)无损信息隐藏算法。

图1： bundy

a) PSNR: 40.8636 697 b) PSNR: 32.9181 697×

2

图2： gentlemen

a) PSNR: 40.5808 734 b) PSNR: 30.1295 734×2

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考虑压缩处理带来的影响是视频信息隐藏设计的重要问题。新的图像或视频压缩标准采用自适应的量化方案。针对这种情况,提出一种改进的DCT信息隐藏算法。根据不同的量化步长自适应地在单个块内选择隐藏信息的嵌入位置和强度,保证了视觉质量而不失稳健性。能实现低失真隐秘通信

图3： bus a) PSNR: 40.7556 736 b) PSNR: 30.9011 736×2

图4： flower

a) PSNR: 40.8914 648 b) PSNR: 30.8937 648×2

A lossless Information Hiding Method For Compressed

Video/Image

Department of Automation, Nanjing University of Science & Technology, 210094 YE Deng-Pan DAI Yue-Wei WANG Zhi-Quan

1. Abstract

During designing video watermarking scheme, affection of video compression processing must be considered. And new video or image compression standard generally adopted adaptive quantized scheme. Accordingly, a new improved lossless information hiding method for MPEG video was proposed. The algorithm can realize low distortion covert communication and original MPEG video data can be recovered in some special application for the purpose of military or medical. Good security and low complexity was achieved. Experimental results showed that the algorithm could meet different demands in different application after small modification and could survive appropriate MPEG recompression etc.

Keywords: variable Quantization Compression, JPEG, MPEG, DCT-based information hiding

叶登攀：男。1975年生。博士研究生。主要研究方向是多媒体信息安全及版权保护，视频水印技术。戴跃伟:男。1962年生。博士。教授。主要研究领域为信息处理与信息安全。王执铨：男。1939年生。教授，博士生导师，研究领域为信息安全技术、混沌控制与应用、大系统的容错控制理论与应用等。

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