The original binary watermark image was firstly encrypted pro rata through Human visual system (HVS) principle and embedded into the DWT low frequency sub-band of green components.

• 原始二值水印图像按比例进行分解，结合HVS原理，将分解的水印图像嵌入到绿色分量的低频和中低频三级小波变换系数中。