A New V-Net Convolutional Neural Network Based on Four-Dimensional Hyperchaotic System for Medical Image Encryption

Table 3

Local IE comparison.

Image	Size	Plaintext entropy	FRFT	ASFS	CENN	Proposed
Lena	256 × 256	6.7094	7.9031	7.9034	7.9032	7.9021
Skull	256 × 256	7.3118	7.9028	7.9031	7.9029	7.9024