Reversible Image Watermarking Algorithm Based on Quadratic Difference Expansion

Table 6

Performance comparison of multiround watermarking embedding algorithms.

Image name	Evaluating indicator
	One round		Two rounds		Three rounds
	PSNR	SSIM	PSNR	SSIM	PSNR	SSIM
Lena	65.47	0.992	58.41	0.989	50.56	0.985
Baboon	64.21	0.991	57.19	0.987	49.07	0.982
Barbara	64.98	0.992	57.86	0.988	50.11	0.984
Peppers	64.35	0.991	57.27	0.988	49.31	0.983