A Steganographic Method Based on Pixel-Value Differencing and the Perfect Square Number

Table 4

Comparison between Wu and Tsai’s method and the proposed method by theoretical analysis.

Cover images (512×512)	Wu and Tsai’s method with the range widths of 2, 2, 4, 4, 4, 8, 8, 16, 16, 32, 32, 64, and 64			Proposed method
	Capacity	Payload	PSNR	Capacity	Payload	PSNR
Lana	173640	0.66	47.75	198209	0.76	49.23
Baboon	213681	0.82	42.31	229459	0.88	46.17
Peppers	176685	0.67	45.71	200831	0.77	49.10
Jet	163312	0.62	46.01	191383	0.73	47.96
SailBoat	188086	0.72	44.86	209494	0.80	47.87
Tiffany	167645	0.64	46.83	191290	0.73	49.18