Parallel Encryption of Noisy Images Based on Sequence Generator and Chaotic Measurement Matrix

Table 2

Information entropy of encrypted images.

Entropy	Compression ratio
	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1
Cipher image	7.9920	7.9936	7.9937	7.9954	7.9960	7.9965	7.9972	7.9970