为了提高隐写方案的安全性,提出一种基于最小嵌入失真原理和网格码的图像隐写算法。首先在离散小波域结合人眼视觉特性和整数提升小波变换设计了失真测度函数,主要考虑了亮度、频率和纹理掩蔽因子对载体失真的影响。然后结合网格码设计了隐写算法,将嵌入信息对载体的修改最小化并且集中在人眼不敏感区域。实验结果显示,方案具有良好的视觉不可见性,且能抵抗空域、小波域等隐写分析的攻击,安全容量达到0.4 bits/pixel。

In order to improve the security of steganography system, an image steganography method based on Minimizing Embedding Impact and Syndrome-Trellis Codes is proposed. First, a distortion function in discrete wavelet transform(DWT) domain was designed according to human visual system and integer lifting wavelet transform, which is mainly concerned about the influences of frequency, luminance, and texture masking factor to the cover distortion. Then, the Syndrome-Trellis Codes are combined with the distortion function to propose the steganography method,to make sure that the embedding impact on the cover minimizing and centralizing is in the un-sensitivity domain. Experiments show that the proposed approach maintains a good visual quality of the stego-image and has a high security against steganalysis in space and wavelet domain. The security capacity can be about 0.4 bits/pixel.