Reversible Image Watermarking Algorithm Based on Quadratic Difference Expansion

Table 2

Comparison of PSNR (dB) and SSIM.

Image name	Proposed algorithm		Literature [10] algorithm
	PSNR	SSIM	PSNR	SSIM
Lena	79.59	0.997	45.72	0.983
Baboon	76.87	0.995	47.37	0.985
Barbara	78.46	0.996	44.94	0.982
Peppers	77.76	0.996	45.81	0.981