Automatic Calibration Requirements
This topic describes the requirements that must be fulfilled to obtain optimal calibration results.
Image Source Equipment Requirements
The image source equipment including: the camera, the lighting and the optical elements, must exhibit:
- A linear response: The digital value of each color component must be proportional to the light intensity of the corresponding color.
- A moderate color imbalance: The ratio between the response of the strongest color component and the weakest color component must be less than 5.
Calibration Target Requirements
The calibration target is a neutral color object located in the field of view of the camera during the calibration process.
The form of the target can be either:
- Clustered light gray pixels located in a specific area of the camera field of view.
- Non-clustered-light gray pixels located in a specific area of the camera field of view.
- Non-clustered-light gray pixels located anywhere in the camera field of view.
The calibration target can be:
- In the object to inspect.
- A specific object placed in the camera field of view during the calibration phase.
The appearance of the target must be:
- A neutral light gray color.
- The level of the brightest component within 75% to 90% of the full scale.
- The level of the darkest component above 15% of the full scale.
The target must contain at least 256 pixels satisfying the appearance requirements.
Acquisition Channel Settings
The parameter WBO_Mode
must be set to ONCE
.
The parameters defining the position and the
size of the AWB_AREA must be configured such that:
Specifically on Grablink Base, Grablink DualBase, Grablink Full, and Grablink Full XR:- It includes at least 256 pixels satisfying the calibration target appearance requirements.
- It contains at least 1 line and 32 columns of pixels.
- It is located entirely within the Camera Active Area.
- The LUT Operator must be disabled.
- The position and the size of the cropping area must be configured such that it encompasses the AWB_AREA