Vehicle Camera Calibration Using Projected Patterns and 3D Positioning
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Solution Overview
Problem
Existing vehicle camera calibration methods require precise positioning of vehicles and calibration elements, which is cumbersome and limits flexibility and precision.
Innovation Solution
A method using multiple calibration cameras and a projector to capture and project calibration patterns without moving the vehicle, allowing flexible and precise calibration of vehicle cameras by ascertaining spatial positions and deviations from a reference coordinate system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If predefined markings on the ground and/or objects are used for calibration, then calibration accuracy can be achieved, but precise positioning of vehicles and calibration elements is required which is cumbersome and limits flexibility
Solution Approach 1:
The patent uses a predefined calibration pattern that is projected onto the ground rather than using physical markings. This virtual copy of the calibration pattern eliminates the need for physical calibration elements and precise positioning, while maintaining calibration accuracy through digital projection and recognition.
Solution Approach 2:
The patent replaces the mechanical system of physical calibration markings and precise vehicle positioning with an optical-projection system. The calibration pattern is projected onto the ground and recognized by the vehicle camera, eliminating the need for mechanical positioning of both the vehicle and calibration elements.
2Adaptability or versatility
If traditional calibration methods with predefined markings are used, then calibration can be performed, but flexibility and precision are limited due to cumbersome positioning requirements
Solution Approach 1:
The calibration pattern exists as a digital projection rather than a physical object, allowing it to be projected anywhere on the ground surface. This enables flexible calibration in different locations and orientations without requiring physical relocation or reconfiguration of calibration elements.
Solution Approach 2:
The calibration pattern can be dynamically projected at different positions, orientations, and scales by the projector system. This dynamic capability allows the calibration setup to adapt to various vehicle positions and camera configurations, greatly enhancing flexibility while simplifying the overall process.
Data Source
AI summary
Calibration of a vehicle camera. A method for the calibration includes: capturing the vehicle using first, second, and third calibration cameras; ascertaining a spatial position of the vehicle in relation to a reference coordinate system in calibration images generated by the calibration cameras; capturing a reference for a projector arranged in the environment of the vehicle by at least one of the calibration cameras; ascertaining a spatial position of the projector in relation to the reference coordinate system based on the captured reference for the projector; projecting a predefined calibration pattern into a capture region of the vehicle camera using the projector; capturing the calibration pattern using the vehicle camera; ascertaining deviations of the calibration pattern captured by the vehicle camera from an expected calibration pattern in an image generated by the vehicle camera; and using calibration information that represents the ascertained deviations for calibrating the vehicle camera.