Data-Hiding Scheme Using Multidirectional Pixel-Value Differencing on Colour Images

Table 1

Comparison of for the proposed scheme and other schemes.

	Wu and Tsai’s scheme [18]	Nagaraj et al.’s scheme [27]	Prema and Manimegalai’s scheme [28]	Shiv and Arup’s scheme [30]	Proposed scheme (two directions)
	Colour image	Colour image	Colour image	Colour image			Average
	(dB)	(dB)	(dB)	(dB)	-1 (dB)	-2 (dB)
Lena	40.0379	49.8948	43.7599	30.7933	30.9791	32.2565	30.9791
Tiffany	41.6758	49.9241	43.8679	31.2709	30.2070	30.4749	30.3409
Macaw	41.4435	50.0031	43.8326	30.4724	30.5083	32.7829	31.6456
Beach	43.1482	49.9013	42.1780	41.0727	35.1747	36.2268	35.7007
Pens	41.8196	49.8866	43.1339	32.6592	29.8021	32.4704	31.1362
Girl	41.7187	49.8949	43.0240	32.8201	30.2782	32.9632	31.6207
Cat	42.5678	49.8925	43.7878	37.4366	34.0405	36.0262	35.0333
Flower	42.0581	49.8871	43.2004	31.2419	30.3256	32.8820	31.6038
Average	41.8087	49.9105	43.3480	33.4708	31.4144	33.2603	32.3373