| P&N | Positioning & Navigation |
| BAR | Book Accessing & Returning |
| QR | Quick Response |
| 3D | Three-dimensional |
| QR-FEI | QR code Feature Extraction and Identification |
| LT | Linear Transformation |
| PTM | perspective Transformation Matrix |
| UAV | Unmanned Aerial Vehicle |
| RFID | Radio Frequency Identification |
| IK | Inverse Kinematics |
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