Secure and Efficient Image Transmission Scheme for Smart Cities Using Sparse Signal Transformation and Parallel Compressive Sensing

Table 3

Encryption time (seconds).

Images	Finger	Lena256	Girl	Boat	Peppers	Lena
CR = 0.25	0.2646	0.2768	0.5426	0.5545	0.5296	0.6602
CR = 0.5	0.3074	0.2888	0.6719	0.7034	0.6724	0.6816
CR = 0.75	0.3484	0.3423	0.8248	0.8220	0.8213	0.8213