Calibration Pattern With Alternating Edge Patterns For Lens Aberration
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Solution Overview
Problem
Conventional imaging devices experience measurement errors due to lens aberration and lighting conditions, especially when measuring objects with different change directions of measurement edges, leading to inaccuracies in length measurement.
Innovation Solution
A calibration pattern with a central light or dark area and alternating horizontal and vertical patterns, where edges are equally distant from the center and have identical or different change directions, allowing for selection of appropriate measurement patterns based on the object's pattern, reducing measurement errors and accommodating zoom magnification changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional calibration patterns with small ratio of distance between measurement edges relative to vision field are used, then the calibration pattern size is reduced, but measurement error cannot be sufficiently reduced due to lens aberration
Solution Approach 1:
The patent applies local quality by creating different calibration patterns (first calibration pattern with light area at center, second calibration pattern with dark area at center) optimized for different measurement scenarios. Each pattern provides locally optimized measurement edges with specific gray value change directions, allowing the system to select the appropriate pattern based on the object being measured, thereby achieving high measurement precision without requiring large calibration pattern sizes.
Solution Approach 2:
The patent changes parameters by varying the gray value distribution and edge characteristics in different calibration patterns. By controlling the gray value change direction (increasing or decreasing from center) and the distance between measurement edges, the system can optimize measurement precision for different object types while maintaining compact calibration pattern sizes suitable for various zoom magnifications.
2Measurement precision
If multiple calibration patterns are used for different zoom magnifications, then measurement error is corrected for various zoom levels, but calibration time increases
Solution Approach 1:
The patent achieves universality by designing calibration patterns that can be effectively used across different zoom magnifications. The first and second calibration patterns are designed with measurement edges positioned and oriented such that they provide accurate reference measurements regardless of the zoom level, eliminating the need for separate calibration patterns for each magnification and thereby reducing calibration time while maintaining measurement precision.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the calibration patterns with measurement edges that are equally distant from the center and have optimized gray value change directions. This preliminary design ensures that the same calibration patterns can serve multiple zoom magnification levels without requiring real-time adjustment or multiple calibration procedures, thus reducing calibration time while maintaining accurate measurement error correction.
3Adaptability or versatility
If measurement edges have different change directions of gray value, then calibration can be performed for various object patterns, but measurement error increases
Solution Approach 1:
The patent applies dynamics by making the calibration system adaptive through the selection of appropriate calibration patterns based on the measurement object's characteristics. The system dynamically selects between the first calibration pattern (with light area at center) and the second calibration pattern (with dark area at center) depending on whether the object has a light or dark central area, ensuring that the measurement edges have the correct gray value change direction for accurate measurement while maintaining versatility for different object types.
Data Source
AI summary
A calibration pattern is provided with a central portion and a frame pattern provided outside thereof, the central portion being provided with a rectangular light area in the central portion of the calibration pattern. The frame pattern has a horizontal pattern and a vertical pattern, the horizontal pattern extending to two horizontal sides centering the central portion and alternately provided with a light area and a dark area at a predetermined interval different from an equal interval, the vertical pattern extending to two vertical sides centering the central portion and alternately provided with a light area and a dark area at a predetermined interval different from an equal interval. The horizontal pattern and the vertical pattern include edges, each being positioned equally distant from a predetermined position in the central portion to the two sides, and the edges have an identical change direction of a gray value.