[Retracted] Cryptospace Invertible Steganography with Conditional Generative Adversarial Networks

Figure 4

Pictured from left to right are the Butterworth high-pass, all-pass, and low-pass filters with fixed order () and different cutoff frequency settings. (a). (b). (c). (d). (e).

(a)

(b)

(c)

(d)

(e)