1. Roll Angle (Skew Angle)
Definition: The rotational angle of the barcode relative to the scanner, i.e., the tilt angle of the barcode in the horizontal plane.
Impact: If the barcode is rotated excessively, it may exceed the scanner's decoding range, leading to a failed read.
Example: The barcode is rotated clockwise or counterclockwise by a certain angle.
2. Pitch Angle
Definition: The angle of inclination of the barcode relative to the scanner in the vertical direction, i.e., the tilt of the barcode in the vertical plane.
Impact: A large pitch angle can cause the barcode image to distort, affecting the scanner's ability to recognize it.
Example: The scanner tilts upward or downward while scanning the barcode.
3. Yaw Angle
Definition: The angle of inclination of the barcode relative to the scanner in the horizontal direction, i.e., the left-right offset of the barcode in the horizontal plane.
Impact: A large yaw angle can cause parts of the barcode to be missed by the scanner, affecting the read.
Example: The scanner tilts left or right while scanning the barcode.
Distinctions
| Parameter | Direction | Description | Impact |
| Roll | Horizontal rotation | The rotational angle of the barcode in the horizontal plane | Excessive rotation of the barcode may lead to decoding failure |
| Pitch | Vertical tilt | The up-down tilt of the barcode in the vertical direction | Barcode image distortion, affecting recognition |
| Yaw | Horizontal tilt | The left-right offset of the barcode in the horizontal direction | Parts of the barcode may be missed by the scanner |
Practical Considerations in Application
Scanner Design:
High-performance scanners typically support a wider range of roll, pitch, and yaw angles to adapt to various scanning scenarios.
Using wide-angle lenses and advanced decoding algorithms can enhance tolerance capabilities.
Barcode Placement:
Place the barcode directly in front of the scanner to minimize tilt angles.
Avoid excessive rotation or tilt of the barcode to ensure it is clearly visible.
Environmental Factors:
Lighting, reflections, and barcode quality can also affect scanning performance and should be considered comprehensively.
Summary
The roll, pitch, and yaw angles describe the angles of the barcode in the directions of horizontal rotation, vertical tilt, and left-right offset, respectively. Their differences lie in the direction and their impact on scanning performance. In practice, it is important to keep these angles within the scanner's allowable range to ensure efficient and accurate scanning.
