说明：  LSB算法简单，实现容易，同时可以保证数字水印的不可见性，由于可以在最低位的每个像素上都插人数字水印信息，因此有较大的信息嵌入量
(The LSB algorithm is simple, easy to implement, and can ensure the watermarking invisibility, because can insert watermarking information of each pixel in the low, therefore a high embedding capacity)