高藏入效率的雙影像可逆式資訊隱藏技術

近年來，許多專家學者提出可逆式資訊隱藏技術來保護資料，如：Lee和Huang學者於2011年提出了一個雙影像可逆式資訊隱藏技術，該技術進行藏入動作時，僅會對像素進行加減1之修改，故可得到一張高品質的偽裝影像，然而，此方法每四個像素僅能藏入五個機密位元，藏入量仍有改善的空間，因此本論文提出一個高藏入效益的雙影像技術方法，所提方法對每個像素可藏入T個機密位元，其中T為一個自適應的門檻值，故能藉由T控制藏入量和偽裝影像品質。實驗結果顯示所提方法除了達到T位元的藏入效益外，所產生的偽裝影像品質也優於Lee和Huang的方法。

In recent years, many scholars have proposed the reversible information hiding methods to protect the confidential data. For example,Lee and Huang proposed areversible information hiding methodin 2011. Theymodifythe pixel by addingor subtractingone to embed secret data. Consequently, the quality of stego image obtained by the above modification rules is excellent.However,intheirmethod, each set offour pixelscan be used to embedfive secret bits,thereby the rule restricting the hiding capacity. In this paper, we proposeda reversible information hidingmethodwith high embedding rate to improve the drawback of Lee and Huang’s method. In our method, each pixel can embed Tsecretbits, whereTis an adaptive thresholdand is used to control the image quality and hiding capacity.Experimental results show thatthe embedding rate of the proposed methodachievesTbpp, which is better than that of the recently proposed methods.