改进的双线性插值算法在信息隐藏中的应用

Application of data hiding based on improved bilinear interpolation algorithm

针对传统信息隐藏算法隐藏容量小和对图像质量影响较大的缺点,提出了一种新的信息隐藏算法。利用灰度级插值的方法来修改秘密信息嵌入点的像素灰度值,为隐藏秘密信息创造出更大的冗余空间;同时采用新的相邻像素差值计算方法以实现秘密信息的嵌入,使得嵌入大量秘密信息后,载密图像的质量得到很好的保证。实验结果表明,当PSNR>40dB时,最低也可以隐藏145800bit。与传统的算法相比,隐藏容量有了更大提升的同时,PSNR值也保持在很高的水平。

For the shortcomings of low hiding capacity and great impact on image quality in the traditional hiding algorithm,this paper proposed a new data hiding algorithm.It utilized gray-level interpolation to modify the pixel gray value that the secret data to be embedded for the purpose of creating a bigger space for hiding.Meanwhile,it adopted a new method to calculate the difference of adjacent pixels to achieve data hiding which could guarantee the image quality after embedding a large number of secret data.Experimental results indicate that the hiding capacity can be up to 145 800 bit at least where PSNR more than 40 dB.Compared with the traditional algorithms,hide capacity is further improved,at the same time,PSNR value is also maintained at a high level.