Reversible Image Watermarking Algorithm Based on Quadratic Difference Expansion

Table 5

Performance comparison of multiround watermarking embedding algorithms.

Image name	Evaluating indicator
	One round		Two rounds		Three rounds
	PSNR	SSIM	PSNR	SSIM	PSNR	SSIM
Lena	79.59	0.997	77.23	0.996	75.11	0.994
Baboon	76.87	0.995	74.92	0.994	73.03	0.993
Barbara	78.46	0.996	76.51	0.995	74.39	0.994
Peppers	77.76	0.996	75.63	0.995	73.67	0.994