基于图像复杂度的隐写方法研究

摘要

为了提供较大的隐写容量和保持良好的载密图像质量,依据人眼对纹理、边界和黑暗区域变化敏感性弱的视觉特点,结合小波变换提出了一种图像复杂度描述方法,将图像小块分为纹理、边界、黑暗和平滑四个不同类别,利用模函数设计隐写算法,在不同区域嵌入不同量的信息.实验结果表明,新的复杂度描述方法能准确区分不同类型的小块,隐写算法在提高嵌入容量的同时保持了较好的视觉质量.%In order to provide larger capacity of the hidden secret data and maintain a good visual quality of stego-image, accordance with the visual property that human eyes are insensitive to texture, edged and dark area, this paper defined a sound complexity notion based on wavelet composition. The image blocks was divided into four kinds (texture, edged, dark and smooth), inserted different amount of information into different kinds of blocks using modulus function. From the experimental results, the complexity notion can distinguish different kinds of blocks precisely, and the steganography method can hide much larger information and maintain a good visual quality of stego-image.