Purpose of extrinsic parameter calibration
The main objective of calibrating the extrinsic parameters of a 3D camera is to ensure the camera can accurately capture the three-dimensional information of objects in the scene and correctly map it to the world reference frame. This enables accurate three-dimensional locating of objects. Accurate extrinsic parameters enable the camera to accurately track and estimate the poses of objects in the scene, such as rotation and translation, providing reliable support for various vision tasks.
Choosing a calibration board of proper dimensions can improve the accuracy and stability of calibration. Both the cameraโs field of view and image resolution are criteria for selecting the calibration board. Please refer to the table below for specific guidelines on how to choose.
Recommended calibration board models
For V4&V5 cameras
| Camera Model | Using Distance(mm) | Recommended calibration board model |
|---|---|---|
| UHP | 300ยฑ20 | OCB-5 |
| NANO | 300โ600 | CGB-20 |
| NANO ULTRA | 400โ800 | CGB20 |
| PRO XS | 300โ600 | CGB-20 |
| PRO S | 500โ800 | CGB-20 |
| PRO S | 800โ1000 | CGB-35 |
| PRO M | 1000โ1500 | CGB-35 |
| PRO M | 1500โ2000 | CGB-50 |
| LSR S | 500โ1000 | CGB-35 |
| LSR S | 1000โ1500 | CGB-50 |
| LSR L | 1200โ3000 | CGB-50 |
| DEEP | 1200โ3500 | CGB-50 |
For V3 cameras
| Camera model | Using Distance(mm) | Recommended calibration board model |
|---|---|---|
| Log S | 500โ800 | CGB-20 |
| Log S | 800โ1000 | CGB-35 |
| Log M | 1000โ1500 | CGB-35 |
| Log M | 1500โ2000 | CGB-50 |
| Laser L Enhanced | 1500โ3000 | CGB-50 |