Texture Directionality-Based Digital Watermarking in Nonsubsample Shearlet Domain

Table 4

Experimental results for the scaling attack.

Test image	Scale = 1/4; SSIM/NC/BER	Scale = 1/2; SSIM/NC/BER	Scale = 2; SSIM/NC/BER	Scale = 4; SSIM/NC/BER
Lena	0.9599/0.9829/0.8545	0.9178/0.9702/1.4893	0.9888/0.9946/0.2686	0.9893/0.9946/0.2686
Snow	0.9056/0.9956/0.2197	0.8074/0.9961/0.1953	0.9752/0.9951/0.2441	0.9764/0.9937/0.3174
Snow2	0.9138/0.9985/0.0732	0.8248/0.9902/0.4883	0.9783/0.9985/0.0732	0.9794/0.9829/0.8545
Crowd	0.9831/0.9604/1.9775	0.9469/0.9902/0.4883	0.9960/0.9648/1.7578	0.9962/0.9834/0.8301
Woman	0.9229/0.9897/0.5127	0.8451/0.9937/0.3174	0.9793/0.9946/0.2686	0.9803/0.9951/0.2441
Lake	0.8009/0.9897/0.5127	0.6969/0.9863/0.6836	0.9373/0.9917/0.4150	0.9402/0.9922/0.3906
Plane	0.9382/0.9785/1.0742	0.8480/0.9946/0.2686	0.9851/0.9834/0.8301	0.9925/0.9634/1.8311
Baboon	0.8145/0.9961/0.1953	0.6419/0.9946/0.2686	0.9498/0.9829/0.8545	0.9523/0.9985/0.0732
Peppers	0.9131/0.9927/0.3662	0.8616/0.9922/0.3906	0.9694/0.9941/0.2930	0.9707/0.9932/0.3418
Scenery	0.7834/0.9243/3.7842	0.6043/0.9097/4.5166	0.9402/0.9727/1.3672	0.9432/0.9727/1.3672
Man	0.9526/0.9849/0.7568	0.8840/0.9897/0.5127	0.9882/0.9922/0.3906	0.9888/0.9912/0.4395
Bridge	0.9227/0.9160/4.1992	0.8152/0.9858/0.7080	0.9811/0.9888/0.5615	0.9820/0.9780/1.0986