基于直方图平移的医学图像可逆水印算法

结合医学图像特点,提出一种基于分块的灰度直方图平移水印算法.首先构建图像的灰度直方图,寻找峰值点和零值点；然后对图像分块,根据图像块的特点设定标志位；最后在指定的图像块内通过直方图变换来嵌入水印.实验结果表明,该算法不仅可以实现可逆水印,而且水印不可见性较好,嵌入容量较高,算法复杂度较低.该算法可以应用到信息隐藏、图像认证、隐秘传输等安全领域.

The Reversible Watermarking Algorithm for Medical Image Based on Histogram Shifting

The reversible watermarking algorithm was proposed based on histogram shifting and image blocking according to the properties of medical images. At first it constructed the gray histogram of image, found the peak and zero point, then split the image into blocks and set the flag, finallly embedded the the watermark and shifted histogram in the particular image block. The test result showed that the algorithm could implement reverable watermarking with better invisibility, the capacity of watermark was good and the complexity of algorithm was low. This algorithm can be applied to information hiding, image authenticatoin, secrete information transfer and the related areas.