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

Figure 8

Robustness evaluation against noise: (a) sequentially cipher images with salt and pepper noise intensities 0.1%, 0.3%, 0.5%, and 0.7%, respectively; (c) sequentially cipher images with Gaussian noise intensities 0.0001%, 0.0003%, 0.0005%, and 0.0007%, respectively; (e) sequentially cipher images with speckle noise intensities 0.0001%, 0.0003%, 0.0005%, and 0.0007%, respectively; (b, d, f) the decrypted images corresponding to (a, c, e), respectively.

(a)

(b)

(c)

(d)

(e)

(f)