運用可位移嵌入策略以提高圖像品質之可逆式資訊隱藏技術

Reversible Data Hiding Scheme Using Shiftable Block Strategy for Enhancing Image Fidelity

沈肇基

國立中興大學

台中市南區興大路145

jjshen@nchu.edu.tw

 

李金鳳*

朝陽科技大學

台中市霧峰區吉峰東路168

lcf@cyut.edu.tw

 

吳宜蓁

國立中興大學

台中市南區興大路145

g107029080@smail.nchu.edu.tw

摘要

資訊隱藏是將特定的資訊嵌入媒體(:文本、圖像、視頻),目的在於保護隱藏的資訊不引起監控者的注意,而減少被攻擊的可能性,本研究使用圖像作為嵌入媒體,並選擇可逆式資訊隱藏(Reversible Data Hiding, RDH)作為嵌入方法,在取出機密資訊後,能還原至原始影像,著名的可逆式資訊隱藏方法如: 2003 Tian 學者所提出的差值擴張(Difference Expansion, DE)2013 Li 學者等人提出的像素值排序法(Pixel Value Ordering, PVO)等等,諸多學者都思索如何改善資訊隱藏的演算法,以求獲得更大的嵌入容量及更高的偽裝影像品質,本研究亦提出了一種使用可位移區塊嵌入的策略應用在PVODE系列,來提升偽裝影像的影像品質。實驗結果顯示本研究的確有效的提升影像品質與藏量。

關鍵詞:資訊隱藏、可逆式資訊隱藏、影像品質、可位移雙層嵌入策略

Abstract

In data hiding methods, secret information is embedded into the cover media (e.g. text, images, video) to protect the information from any malicious attacks. This paper uses images as embedded media and Reversible Data Hiding (RDH) as the embedding method. RDH methods can restore the original image after extracting secret data. The famous RDH methods include: Differential Expansion method (DE) proposed by the Tian in 2003, Pixel Value Ordering method(PVO) proposed by Li et al. in 2013. Many scholars are thinking about how to improve the information hiding algorithm in order to obtain greater embedded capacity and higher stego image's quality. This paper proposes a method of using shiftable blocks embedding strategy based on PVO series and DE series to improve the image quality of stego images. The experimental results show that the image quality for the proposed method is enhance.

Keywords: data hidingreversible data hiding (RDH)image fidelityshiftable blocks embedding strategy