一种有效的图像密写算法

信息隐藏是在不影响载体数据可用性的前提下,将秘密信息隐藏在诸如图像、视频和语音信号等数字多媒体中的一种信息安全技术。提出一种基于变换域容量较大的数字图像密写算法,算法首先将图像在空域进行解相关,之后在变换域进行信息嵌入。通过对图像的解相关可以大大增加变换域的可用系数,也就相应增加了可嵌入的信息量。实验结果表明,算法在达到最大的嵌入信息量时,不但可以保持较高的密写图像质量,而且对于信息量估计法、RS分析法以及Jeremiah提出的直方图分析法都具有很好的抵抗性。

An Effective Image Steganographic Algorithm

Information hiding is an information security technology of secretly embedding information into digital multimedia such as image,video and audio signals without changing the perceptual quality of the carrier data.A high embedding capacity steganographic method in still images based on transform domain is proposed.The method embeds the information in the transform domain after decorrelating the image in the spatial domain.The decorrelation results in a significant increase in the number of transform coefficients that can be used to embed the secret information.Experimental results show that the proposed method can preserve not only good steganographic image quality,but have a good performance also in resisting to information quantity estimation method,RS analysis method and Jeremiah's histogram analysis method with the maximum embedding capacity.