摘要
为了在保持一定图像质量与嵌入容量的前提下进一步提高空间域隐写术的嵌入效率,结合用于描述图像平滑程度的像素差概念,提出一种空间域分块像素差和模函数大容量信息隐藏的方法。像素差可以区分图像的平滑区和边缘区,根据人类视觉系统的特点,边缘区域比平滑区域能承受更大的改变,因此基于像素差的信息隐藏方法能够获得更加符合人类视觉系统特性的含密图像。将像素差的概念扩展到像素块,同时利用模函数提高嵌入效率。实验结果表明,改进方法提高了可嵌入信息的容量和含密图像的质量。
A novel information hiding scheme for large payloads using Pixel-Value Differencing Block（PVDB） and modulus function is proposed. PVD is able to distinguish the smooth area from the edge area of a grayscale image in spatial domain. According to Human Vision System（HVS）, the edge area can tolerate more modifications than the smooth area. Therefore, the quality of the stego image using PVD-based steganography method is more reasonable. In this proposed method, the author introduces PVDB and modulus function to improve the embedding capacity and image quality further. The results validate the effectiveness of this method.
出处
《信息与电子工程》
2009年第3期218-221,226,共5页
information and electronic engineering
关键词
分块像素差
自适应
模函数
信息隐藏
pixel value differencing block
adaptive
modulus function
information hiding
