Image Watermark Based on Extended Shearlet and Insertion Using the Largest Information Entropy on Horizontal Cone

Table 4

Experimental results under filtering attack.

Filter	Gaussian low-pass filtering; ()	Average filtering; ()	Average filtering; ()	Median filtering; ()	Windows median filtering; ()	Windows median filtering; ()
Lena
PSNR	41.2527	33.8154	31.2694	36.0472	33.0632	30.7585
MSE	4.8731	27.0112	48.5448	16.1570	33.5627	54.7312
NC	0.9619	0.9058	0.8560	0.8955	0.8652	0.8608
The extracted watermark
Boat
PSNR	38.8456	31.3718	28.6105	32.1768	29.8478	28.7947
MSE	8.4824	47.4128	89.5425	39.3914	67.3442	85.8246
NC	0.8677	0.7930	0.7710	0.8193	0.7891	0.7764
The extracted watermark
Barbara
PSNR	33.7961	25.9565	24.0378	25.3074	24.8688	23.6426
MSE	27.1314	164.9810	256.6278	191.5741	211.9325	281.0734
NC	0.9580	0.8960	0.8604	0.9038	0.8652	0.8901
The extracted watermark