Table 2.
Variance of Histogram of cipher images
| Image (256 × 256) | Variance |
|---|---|
| Lena | 237.2784 |
| Peppers | 256.6196 |
| OPENi1 | 288.5020 |
| OPENi2 | 232.5961 |
| OPENi3 | 215.4039 |
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