Vehicle Camera Calibration Using Beacon-Aided Pattern Alignment
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Solution Overview
Problem
Conventional in-vehicle camera calibration devices face accuracy issues due to marker deformation caused by ground unevenness or inclination, leading to inaccurate camera attachment angle calculations.
Innovation Solution
An in-vehicle camera calibration system comprising a control device mounted on a vehicle and a pattern-with-a-beacon installed outside, utilizing a calibration pattern and a beacon for wireless communication to transmit beacon information, enabling accurate calibration by comparing pattern images with received information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a light emitting device forms a marker on the ground for camera calibration, then the operation is simplified and accuracy of correction is enhanced, but the marker deformation due to ground unevenness or partial inclination causes inaccurate camera attachment angle calculation
Solution Approach 1:
The patent introduces a beacon as an intermediary element that transmits wireless signal information containing precise positional data. This beacon acts as a mediator between the calibration pattern and the control device, providing accurate reference information that compensates for marker deformation caused by ground unevenness, thereby resolving the contradiction between operational simplicity and measurement precision
Solution Approach 2:
The patent replaces the purely optical/mechanical marker recognition system with an electronic wireless communication system. Instead of relying solely on visual pattern recognition which is affected by ground deformation, the system uses wireless signal transmission from the beacon to provide accurate positional information, substituting mechanical/optical measurement with electronic data transmission to maintain precision
2Ease of manufacture
If a light emitting device forms a marker on the ground for camera calibration, then manual position setting is eliminated, but ground unevenness causes marker deformation that deteriorates correction accuracy
Solution Approach 1:
The beacon provides feedback information in the form of wireless signals containing precise positional data about the calibration pattern's location. This feedback mechanism allows the control device to accurately determine the marker's position even when deformed by ground unevenness, maintaining manufacturing precision while preserving the ease of setup
3Device complexity
If calibration is performed using only visual pattern recognition, then the system is simple, but accuracy deteriorates when the marker is deformed by ground conditions
Solution Approach 1:
The patent merges two different information sources: visual pattern recognition from the calibration pattern and wireless signal information from the beacon. By combining these two independent measurement methods, the system maintains simplicity while achieving high precision, as the wireless data compensates for deformations that affect visual recognition
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system allows for precise and effortless calibration of vehicle-mounted cameras, mitigating errors from camera mounting position changes and vehicle attitude shifts, and facilitating easy calibration during manufacturing or dealership setups.
Implementation Method 1
a beacon configured to transmit beacon information by wireless communication
Data Source
AI summary
The present disclosure provides an in-vehicle camera calibration device, a control device, and a pattern-with-a-beacon capable of performing calibration of a camera mounted on a vehicle more accurately and easily. The in-vehicle camera calibration device 100 includes a control device 110 to be mounted on a vehicle 200 and a pattern-with-a-beacon 120 to be installed outside the vehicle 200. The pattern-with-a-beacon 120 includes a calibration pattern 121 captured by the camera 201 mounted on the vehicle 200 at the time of calibration, and a beacon 122 that transmits beacon information Ib by wireless communication. The control device 110 calibrates the camera 201 based on the pattern image Gp that is the image of the calibration pattern 121 acquired from the camera 201 and the beacon information Ib received through the receiving antenna 202 mounted on the vehicle 200.