说明：  在Matlab开发环境下，实现将输入的随机字符串以随机序列的方式嵌入载体图像中，并很好的保证了水印的不可见性，同时也实现了水印的盲检测并成功提取出输入的字符。
(In Matlab development environment, to achieve the random string input by random sequence was embedded in the carrier image, and it guarantees the invisibility of the watermark, but also achieve blind watermark detection and successfully extract input characters.)