Table 5 Correlation coefficients of original and encrypted images.
Channel | Row correlation | Column correlation | Diagonal correlation | |||
|---|---|---|---|---|---|---|
Original | Encrypted | Original | Encrypted | Original | Encrypted | |
Experimental image 1 | ||||||
 R | 0.9882 | 0.0001 | 0.9892 | 0.0015 | 0.9787 | − 0.0005 |
 G | 0.9836 | − 0.0002 | 0.9847 | 0.0011 | 0.9701 | − 0.0013 |
 B | 0.9621 | − 0.0016 | 0.9640 | − 0.0006 | 0.9308 | 0.0015 |
Experimental image 2 | ||||||
 R | 0.9343 | 0.0020 | 0.9374 | 0.0012 | 0.8987 | 0.0008 |
 G | 0.9399 | 0.0012 | 0.9431 | 0.0019 | 0.9073 | 0.0003 |
 B | 0.9407 | 0.0017 | 0.9444 | − 0.0001 | 0.9093 | 0.0007 |
Experimental image 3 | ||||||
 R | 0.9853 | 0.0002 | 0.9843 | − 0.0016 | 0.9733 | 0.0003 |
 G | 0.9837 | 0.0009 | 0.9828 | 0.0003 | 0.9705 | 0.0012 |
 B | 0.9730 | 0.0034 | 0.9706 | 0.0001 | 0.9516 | 0.0001 |
