In the realm of computer vision and camera calibration, selecting the appropriate calibration board is crucial for achieving accurate and reliable results. Whether you’re involved in robotics, industrial inspection, or any application that requires precise measurements, understanding the advantages of different calibration boards can make a significant difference. Here, we'll discuss the benefits of ChArUco and checkerboard calibration boards to help you choose the right one for your needs. Both options are priced the same and come with software that automates the calibration process, making it easy for you to get started.
ChArUco Calibration Boards:
What is a ChArUco Board? A ChArUco board is a hybrid calibration target that combines the features of a checkerboard with ArUco markers.
Advantages:
- Robust Detection: The ArUco markers enable reliable detection even when parts of the board are partially occluded or at extreme angles.
- Sub-pixel Accuracy: The combination of checkerboard corners and ArUco markers allows for precise, sub-pixel accuracy.
- Partial Board Detection: Individual ArUco markers can be detected even if the entire board is not visible in the camera frame.
- Automatic Identification: Unique IDs for each ArUco marker facilitate easy and automatic point matching between images.
When to Choose a ChArUco Board:
- In environments where parts of the board might be occluded.
- When high precision is crucial.
- In variable lighting conditions and angles.
Checkerboard Calibration Boards:
What is a Checkerboard? A checkerboard is a classic calibration target with a grid of black and white squares.
Advantages:
- Simplicity: Easy to use and understand, making it ideal for straightforward calibration tasks.
- High Accuracy: The regular grid pattern ensures accurate corner detection and precise calibration.
When to Choose a Checkerboard Board:
- For simple and straightforward calibration tasks.
- When the entire board can be consistently viewed by the camera.
- In controlled lighting conditions.