Table 6 Correlation of the plain and cipher images.
Image | Direction | Plain image | Cipher image | ||||
|---|---|---|---|---|---|---|---|
Red | Green | Blue | Red | Green | Blue | ||
Fruit | Horizontal | 0.9844 | 0.9879 | 0.9545 | \(-0.0018\) | \(-0.0067\) | \(-0.0064\) |
Vertical | 0.9856 | 0.9735 | 0.9857 | 0.0075 | 0.0018 | \(-0.0077\) | |
Diagonal | 0.9433 | 0.9268 | 0.9402 | 0.0055 | \(-0.0168\) | \(-0.0071\) | |
Baboon | Horizontal | 0.9126 | 0.8962 | 0.9531 | 0.0031 | 0.0084 | \(-0.0169\) |
Vertical | 0.6595 | 0.7867 | 0.8541 | 0.0064 | \(-0.0076\) | \(-0.0852\) | |
Diagonal | 0.7652 | 0.6806 | 0.8443 | \(-0.0384\) | 0.0239 | 0.0259 | |
Pepper | Horizontal | 0.9285 | 0.9465 | 0.9486 | \(-0.0042\) | 0.0092 | \(-0.0086\) |
Vertical | 0.9725 | 0.9772 | 0.9784 | \(-0.0053\) | 0.0041 | 0.0045 | |
Diagonal | 0.9119 | 0.9455 | 0.8801 | \(-0.0345\) | \(-0.0127\) | \(-0.0057\) | |
Lake | Horizontal | 0.9322 | 0.9589 | 0.9647 | 0.0042 | 0.0082 | 0.0062 |
Vertical | 0.9794 | 0.9868 | 0.9863 | \(-0.0085\) | \(-0.0063\) | 0.0058 | |
Diagonal | 0.8935 | 0.9496 | 0.9458 | \(-0.0020\) | 0.0074 | \(-0.0069\) | |
All 0’s | Horizontal | − | − | − | 0.0039 | 0.0039 | 0.0039 |
Vertical | − | − | − | 0.0015 | 0.0015 | 0.0015 | |
Diagonal | − | − | − | 0.0075 | 0.0075 | 0.0075 | |
