Camera Calibration Tool with Multi-Scale Patterns
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Solution Overview
Problem
Existing camera calibration methods become complicated when dealing with multiple cameras that have different angles of view and focal lengths, as they require separate calibration plates, leading to increased complexity in calibration work.
Innovation Solution
A calibration method and tool that utilize patterns with varying shapes, sizes, and arrangements of marks on a single calibration tool, allowing each camera to discriminate and calibrate based on these differences without replacing the calibration plate, thereby simplifying the calibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate calibration plates are used for each camera with different angles of view and focal lengths, then calibration accuracy is improved, but calibration work becomes complicated and time-consuming
Solution Approach 1:
The calibration plate is designed to serve multiple cameras with different specifications simultaneously. By incorporating multiple patterns with different mark sizes on a single plate, the system achieves multi-functionality where one calibration plate can be used for calibrating cameras with various angles of view and focal lengths, eliminating the need for separate calibration plates for each camera.
Solution Approach 2:
Different regions of the calibration plate are designed with locally optimized patterns suited for specific camera types. The plate contains multiple patterns where each pattern has mark sizes appropriate for particular camera specifications, allowing each camera to use the locally suitable pattern while all patterns coexist on a single universal plate.
2Measurement precision
If multiple calibration plates are prepared for different cameras, then each camera can have optimized calibration patterns, but the area and number of calibration tools increase
Solution Approach 1:
Multiple calibration patterns that would traditionally require separate calibration plates are merged into a single calibration plate. The plate integrates multiple patterns with different mark sizes and configurations, combining the functionality of multiple individual plates into one unified tool, thereby reducing the quantity of calibration equipment needed.
Solution Approach 2:
The calibration plate is designed as a universal tool that can be used for calibrating multiple types of cameras simultaneously. By incorporating diverse patterns suitable for different camera specifications on one plate, it replaces the need for maintaining multiple specialized calibration plates.
3Measurement precision
If calibration patterns are designed for specific camera specifications, then calibration accuracy is improved, but adaptability to different cameras decreases
Solution Approach 1:
The calibration plate achieves universality by incorporating multiple patterns that can accommodate different camera specifications. Each pattern on the plate is optimized for particular camera types, yet all patterns are integrated into a single plate that can be used with various cameras, thus maintaining both specificity and adaptability.
Solution Approach 2:
The calibration plate employs local quality by designing different regions with patterns specifically optimized for particular camera specifications. Each local pattern maintains its specialized characteristics for accurate calibration of specific camera types, while the overall plate structure provides adaptability to handle multiple camera types through pattern selection.
Data Source
AI summary
A calibration method for calibrating a first camera and a second camera which are different in at least one of an angle of view and a focal length includes capturing images which include a calibration tool having a first pattern configured with a plurality of first marks and a second pattern configured with a plurality of second marks, different in at least one of a shape between the first mark and the second mark, a size between the first mark and the second mark, and arrangement between the first marks and the second marks, by the first camera and the second camera, and calibrating the first camera and the second camera using patterns corresponding respectively to the first camera and the second camera.