Research Article
A Real-Time Image Encryption Method of Networked Inverted Pendulum Visual Servo Control System
Table 2
Evaluation of encryption effect.
| | | Correlation of pixels | Information entropy | | Vertical | Diagonal | Horizontal |
| | Original image | 0.9858 | 0.9240 | 0.9350 | — | | Encrypted image (unscaled) | 0.0046 | 0.0047 | 0.0180 | 7.9843 | | Encrypted image (scaled ratio: 90%) | 0.0056 | 0.0028 | 0.0296 | 7.9831 | | Encrypted image (scaled ratio: 70%) | −0.0025 | 0.0054 | 0.0312 | 7.9789 | | Encrypted image (scaled ratio: 50%) | 0.0191 | −0.0070 | 0.0406 | 7.9784 | | Encrypted image (scaled ratio: 40%) | −0.0433 | −0.0090 | 0.0330 | 7.9779 | | Encrypted image (scaled ratio: 30%) | −0.0258 | −0.0015 | 0.0157 | 7.9779 |
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