Table 2.

Statistical data of user click random perturbation experiment.

Classification Threshold	Disturbance 5 px	Disturbance 10 px	Disturbance 15 px	Disturbance 20 px	Disturbance 25 px
0.1	92.1	92.6	92.4	92.4	92.2
0.2	92.8	93.1	93.0	93.0	92.8
0.3	93.1	93.3	93.1	93.2	93.1
0.4	93.2	93.4	93.2	93.2	93.2
0.5	93.3	93.4	93.2	93.2	93.2
0.6	93.3	93.3	93.0	93.1	93.1
0.7	93.1	93.0	92.8	92.8	93.0
0.8	92.8	92.5	92.4	92.4	92.6
0.9	91.9	91.4	91.3	91.3	91.6