Novel Variants of a Histogram Shift-Based Reversible Watermarking Technique for Medical Images to Improve Hiding Capacity

Table 3

MSE, PSNR, and MSSIM values for the block-wise embedding technique.

Images	Block size 4 × 4			Block size 8 × 8			Block size 16 × 16
	MSE	PSNR	SSIM	MSE	PSNR	SSIM	MSE	PSNR	SSIM
Cover1	0.8266	48.68	0.9149	0.8481	48.56	0.9146	0.8831	48.39	0.9148
Cover2	0.7822	49.02	0.9273	0.7962	48.96	0.9297	0.8187	48.82	0.9271
Cover3	0.7668	49.28	0.9325	0.7766	49.23	0.9321	0.8022	49.08	0.9317