一种图像可逆信息隐藏方法

S. Arjun, N. Rao
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引用次数: 5

摘要

信息隐藏(又称数据隐藏),是将秘密信息嵌入掩蔽介质中,以达到隐蔽通信、身份识别、安全和版权等目的的过程。信息隐藏用于隐藏消息的内容。这是通过隐藏秘密信息到其他数字媒体,如音频,图像,视频等来实现的。为了在图像中隐藏秘密信息,存在各种各样的技术,其中大多数技术即使在秘密信息恢复后也会由于比特替换或量化错误或截断而导致原始图像失真。对于医疗和军事应用来说,数据提取后获得的图像应该是无失真的,这一点尤为重要。可逆数据隐藏是一种将数据嵌入到数字媒体中,从而在提取出隐藏信息后不失真地恢复原始媒体的技术。本文提出了一种在空间域中嵌入和提取数据的无损方法。该方法仅使用一个统计参数来控制数据的嵌入和提取。提出了两种不同块取向的方法。与现有方法相比,该方法的平均嵌入效率提高了41.57%,同时将覆盖图像的退化(峰值信噪比)保持在相当的水平。为了进一步提高嵌入容量,我们还提出了多层嵌入的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An approach to reversible information hiding for images
Information hiding (also known as data hiding), is a process of embedding secret message into a cover media for the purpose of covert communication, identification, security and copyright. Information hiding is used to conceal the content of messages. This is achieved by hiding secret message into other digital media like audio, images, video etc. For hiding secret message information in images, there exists a large variety of techniques, of which most techniques cause distortions in the original image even after secret message recovery, either due to bit-replacement or quantization error or truncation. It is especially important for medical and military applications that the image obtained after data extraction should be distortion free. Reversible data-hiding is the technique which embeds data in to a digital media such that the original media can be recovered without any distortion after the hidden message has been extracted. In this paper we propose a lossless method which embeds and extracts the data in the spatial domain. This method uses only one statistic parameter which controls the embedding and extraction of data. Two methods with different block orientations have been proposed. The novel method allows for an increase of 41.57% in average embedding efficiency when compared to existing methods, while maintaining the cover image degradation (PSNR - peak signal to noise ratio) at a comparable level. We also suggest a multi-layered embedding for increasing embedding capacity further.
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