Image Encryption Algorithm Based on Adaptive Wavelet Chaos

Table 1

Comparison of image information entropy after encryption of four algorithms.

Method type	Lena	Couple	Gray
[26]	7.9729	7.9836	7.9755
[27]	7.9798	7.9832	7.9817
[28]	7.9817	7.9928	7.9801
Ours	7.9983	7.9985	7.9989