TOF Camera Calibration Using Multi-Board Guide Rail
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Solution Overview
Problem
Existing calibration methods for Time-of-Flight (TOF) cameras are inefficient and produce inaccurate results due to the need for continuous movement of calibration boards, limiting the calibration efficiency and accuracy of multiple TOF cameras.
Innovation Solution
A calibration device with multiple calibration boards spaced apart and TOF cameras mounted on a guide rail, where a controller sends timing control signals to move the cameras along the rail and measure distances simultaneously or alternately, allowing for compensation correction values to be calculated and applied for improved calibration results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single TOF camera is calibrated at a time with continuous movement of calibration board, then calibration can be performed, but calibration efficiency is low and calibration accuracy is insufficient
Solution Approach 1:
The calibration system is segmented into multiple independent calibration boards arranged at different distances, allowing simultaneous calibration of multiple TOF cameras at different positions without continuous movement of a single calibration board
Solution Approach 2:
The calibration setup transitions from a single-dimensional linear movement of one calibration board to a multi-dimensional arrangement with multiple calibration boards at different distances, enabling parallel calibration operations
2Productivity
If multiple TOF cameras are calibrated simultaneously at different distances, then calibration efficiency improves, but device complexity increases
Solution Approach 1:
The guide rail system serves multiple functions: it positions multiple calibration boards at different distances and simultaneously supports multiple TOF cameras, allowing a single structural element to perform multiple calibration operations
Solution Approach 2:
Multiple calibration operations that would traditionally require separate devices are merged into a single integrated calibration system where multiple TOF cameras and calibration boards work together in one setup
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
This solution significantly enhances the calibration efficiency and accuracy of TOF cameras by eliminating the need to move calibration boards and enabling multiple cameras to be calibrated in a single rotation, thereby improving the overall calibration process.
Implementation Method 1
TOF is a technology that achieves accurate distance measurement by measuring time of flight of light by using a characteristic where traveling speed of light is constant in the air
Data Source
AI summary
This application provides a calibration device and a method. The calibration device includes calibration boards arranged at intervals and having board surface parallel to each other, a guide rail disposed at peripheries of the calibration boards, TOF cameras, and a controller. Support frames are arranged at intervals on the guide rail, and the TOF cameras are mounted on the guide rail using the support frames. Distances between the calibration surfaces and the corresponding TOF cameras are different. The controller is connected to the guide rail and the TOF cameras, and configured to send a first set of timing control signals to control the guide rail to carry the TOF cameras to move along the guide rail, and send a second set of timing control signals to the TOF cameras to control the TOF cameras to work simultaneously or alternately to measure distance values between the TOF cameras and the corresponding calibration boards.