By utilizing secondary DCT and the visual masking of HVS, the watermark can be embedded adaptively into the DCs (Direct Coefficient).

• 算法以二次DCT变换为基础，能够将水印信息嵌入到DCT直流系数中，并可根据HVS(人类视觉系统)亮度掩蔽模型，对水印嵌入强度自适应调节。