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

Table 3

Comparison of Quality index values of the proposed scheme and Shiv and Arup’s scheme.

	Shiv and Arup’s scheme [30]	Proposed scheme
	Quality index	Two directions		Three directions
		Quality index-1	Quality index-2	Quality index-1	Quality index-2
Lena	0.6870	0.7653	0.7325	0.7735	0.7148
Tiffany	0.4686	0.4181	0.4563	0.3767	0.4863
Macaw	0.4486	0.4456	0.4401	0.4477	0.4348
Beach	0.3297	0.3346	0.3284	0.3451	0.3190
Pens	0.2370	0.2248	0.2354	0.2221	0.2362
Girl	0.0712	0.0719	0.0693	0.0733	0.0677
Cat	0.3792	0.3804	0.3755	0.3802	0.3756
Flower	0.3294	0.3415	0.3344	0.3456	0.3300
Average	0.3688	0.3727	0.3714	0.3705	0.3705