Programmable Display Calibration Target for Vehicle Vision Sensors
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Solution Overview
Problem
Existing camera calibration methods for far-field cameras require large space for targets, leading to reduced space for other sensor modalities and increased costs, especially in limited geographic locations, due to the need for large or multiple targets to cover the field-of-view.
Innovation Solution
A method and system using a programmable calibration target device with a display screen that generates virtual digital images of calibration patterns at different angles, allowing for efficient calibration of vision sensors by capturing images and processing calibration features, reducing the need for physical target changes and space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large or multiple physical calibration targets are used to cover the field-of-view of far-field cameras, then calibration accuracy is improved, but space requirements increase and costs increase
Solution Approach 1:
The patent uses a programmable display screen to generate virtual digital images of calibration patterns instead of physical calibration targets. The display screen acts as a programmable copy that can present calibration patterns at different orientations and distances virtually, eliminating the need for large physical targets while maintaining calibration accuracy
Solution Approach 2:
The patent changes the parameter of calibration target representation from physical to digital/virtual. By using a programmable display screen that can dynamically generate calibration patterns at different orientations and distances, the system maintains calibration accuracy without requiring large physical space
2Measurement precision
If large physical calibration targets are used, then calibration accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The programmable display screen serves multiple functions: it generates calibration patterns at different orientations, presents targets at different virtual distances, and can be reconfigured for different calibration scenarios. This single multi-functional device replaces what would otherwise require multiple specialized physical calibration targets and positioning mechanisms
Solution Approach 2:
The patent replaces the mechanical system of physical calibration targets with a programmable electronic display system. Instead of physically moving or changing calibration targets, the system uses software to generate and display different calibration patterns, eliminating mechanical complexity
3Measurement precision
If multiple physical calibration targets are used to span the field-of-view, then calibration accuracy is improved, but space requirements and time for calibration increase
Solution Approach 1:
The programmable display screen can rapidly switch between different calibration patterns and orientations through programmed sequences. This periodic action allows the system to present multiple calibration scenarios in quick succession, reducing the time required compared to physically setting up multiple targets
Solution Approach 2:
The calibration patterns are pre-programmed into the display screen system. The processor can quickly retrieve and display different calibration sequences without requiring physical setup time, as all calibration scenarios are prepared in advance in digital form
Data Source
AI summary
A method for calibration of vision sensors includes, by a processor: selecting a calibration sequence that has a base calibration pattern and calibration angles, generating a calibrating target that may include the calibration pattern at a selected calibration angle of the angles, and causing a display screen to display a digital image representative of the target at the selected angle relative to an originating border of the selected angle. Each of the calibration angles is associated with a different originating border of the screen. The method includes by a vision sensor capturing at least one image of the calibrating target displayed on the screen. The calibration is repeated for each calibration angle of the sequence. The method includes performing calibration of the vision sensor in response to image signal processing of extracted calibration features in the at least one image of the calibrating targets.