Reversible Data Hiding in JPEG Images Based on Distortion-Extension Cost
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摘要: 兼顾含密JPEG图像的文件增量和视觉失真，提出一种基于失真-扩展代价的JPEG图像可逆数据隐藏算法.采用直方图平移实现秘密数据的可逆嵌入，重点研究如何根据嵌入容量自适应选择嵌入频率和图像块，以最小化含密JPEG图像的视觉失真和文件增量.分析讨论了通过模拟计算数据嵌入不同频率的单位文件增量确定频率嵌入顺序、根据图像块零交流系数个数和平滑度确定图像块嵌入顺序的合理性，数据嵌入时优先选取较小单位文件增量的频率和较平滑图像块；并分别定义单位文件增量、单位失真-增长比作为算法文件扩展、视觉质量与文件扩展关系的定量评价指标.实验结果表明：与现有同类算法相比，所提的算法可更好地兼顾含密JPEG图像文件增量和视觉质量，降低含密JPEG图像文件增量，相同嵌入容量下单位文件增量平均值降低0.15~0.25.Abstract: Considering the file size increase and visual distortion of the JPEG image with secret data, a reversible data hiding algorithm of JPEG images based on distortion-extension cost is proposed. Histogram shifting is used to realize reversible embedding of secret data, focusing on how to adaptively select embedding frequency and image block according to embedding capacity, so as to minimize the visual distortion and file size increase of JPEG image with secret data. This paper discusses and analyzes the rationality of determining the frequency embedding sequence by simulating the unit increase of file size of different frequencies, and determining the image block embedding sequence by the number of zero alternating current coefficients and smoothness of the image block. When embedding the data, the frequency of the smaller unit increase of file size and the smoother image block are preferred; and the unit increase of file size and the unit distortion-increase ratio are defined as quantitative evaluation indicators of algorithm file expansion, the relationship of visual quality and file expansion, respectively. Experimental results demonstrate that compared with the latest similar algorithms, the proposed algorithm can achieve a better balance between the increase of file size of the JPEG image with secret data and the visual quality, and reduce the increase of file size of the JPEG image with secret data, and the average of unit increase of file size under the same embed capacity has been reduced by 0.15~0.25.
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Keywords:
- reversible data hiding /
- JPEG images /
- histogram shifting /
- file size increase /
- visual distortion
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期刊类型引用(9)
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