期刊名称：IAENG International Journal of Computer Science
印刷版ISSN：1819-656X
电子版ISSN：1819-9224
出版年度：2018
卷号：45
期号：4
页码：540-551
出版社：IAENG - International Association of Engineers
摘要：Development of information technology has supportedthe delivery of multimedia document such as images,audio or video that can be applied in many fields of activity.Nevertheless, this implementation requires security treatmentfor sensitive data. Reversible Data Hiding methods are an optionto meet this requirement. One of them which can be used isPrediction Error Expansion. This method embeds secret datainto expanded prediction error which is a difference betweenpixel for data embedding and pixel for prediction. To improvethe quality of stego image, the Pixel-Value-Ordering conceptis applied when embedding data. This approach is furtherdeveloped by utilizing an expanded prediction error value of0, so that it can increase the capacity of data embedding. Thismethod, however, only uses smooth block and is not suitablefor block pixels whose size is more than 22. In this paper,we propose a new embedding concept that can utilize anotherblock type (e.g. rough type). Furthermore, we also propose a 2bit embedding concept with prevention, to keep the stego imagequality still good. The experimental result shows the averageof stego image quality increases by 4.6 dB with capacity 5-10times bigger than that of the previous method.
关键词：data security; data hiding; information security;multimedia data
