Research Article
Parallel Encryption of Noisy Images Based on Sequence Generator and Chaotic Measurement Matrix
Table 4
Information entropy of encrypted images.
| | Entropy | Compression ratio | | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| | Salt-and-pepper noise | I = 0.02 | 7.9918 | 7.9934 | 7.9948 | 7.9948 | 7.9962 | 7.9964 | 7.9970 | | I = 0.05 | 7.9913 | 7.9933 | 7.9936 | 7.9955 | 7.9957 | 7.9966 | 7.9971 | | I = 0.1 | 7.9921 | 7.9930 | 7.9944 | 7.9962 | 7.9957 | 7.9965 | 7.9971 |
| | Gaussian noise | M = 0, V = 0.01 | 7.9902 | 7.9939 | 7.9951 | 7.9954 | 7.9962 | 7.9955 | 7.9970 | | M = 0, V = 0.02 | 7.9901 | 7.9928 | 7.9946 | 7.9956 | 7.9962 | 7.9969 | 7.9967 | | M = 0.2, V = 0.01 | 7.9901 | 7.9925 | 7.9950 | 7.9951 | 7.9960 | 7.9961 | 7.9971 |
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