Depth Camera Calibration Using Multi-Plane Board
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Solution Overview
Problem
Conventional structured-light depth camera calibration devices are inefficient due to high installation and maintenance costs, and require dynamic adjustment of the camera's positional relationship with the calibration board, prolonging the calibration process and affecting production line efficiency.
Innovation Solution
A depth camera calibration device and method featuring a calibration board assembly with non-coplanar and non-parallel surface planes, each with closed patterns, and a processor that automatically calculates intrinsic and extrinsic parameters by cropping image boundaries, reading projection patterns, and excluding abnormal points, without changing the camera's positional relationship with the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mobile platform is used to dynamically adjust the positional relationship between the depth camera and calibration board, then calibration accuracy can be improved, but calibration time increases and production efficiency decreases
Solution Approach 1:
The calibration board is pre-installed on the optical platform with multiple surface planes at different orientations before calibration begins. This preliminary arrangement eliminates the need for dynamic adjustment during calibration, allowing the camera to capture multiple calibration views simultaneously or in rapid succession, thus improving accuracy without increasing calibration time
Solution Approach 2:
The calibration board transitions from a traditional single-plane configuration to a multi-plane three-dimensional structure with surface planes at different orientations. This dimensional change allows the board to provide multiple calibration perspectives without requiring physical movement or repositioning, resolving the contradiction between accuracy and time
2Adaptability or versatility
If a mobile platform is used to dynamically adjust the positional relationship, then calibration flexibility is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The calibration board is segmented into multiple independent surface planes, each with closed patterns, mounted on a fixed optical platform. This segmentation provides calibration flexibility for different camera orientations while eliminating the need for a complex mobile platform, thus reducing device complexity and maintenance costs
Solution Approach 2:
The fixed optical platform serves as an intermediary structure that holds the multi-plane calibration board. This intermediary provides the necessary adaptability and versatility for calibration without requiring active movement mechanisms, thereby reducing device complexity while maintaining calibration flexibility
3Adaptability or versatility
If conventional calibration methods are used with dynamic adjustment, then calibration adaptability is improved, but installation and maintenance costs increase
Solution Approach 1:
The calibration board is designed as a self-contained unit with multiple surface planes and closed patterns that automatically provides calibration data for various camera orientations. This self-service design eliminates the need for complex installation and maintenance of mobile platforms, reducing costs while maintaining calibration adaptability
Solution Approach 2:
The calibration board is pre-configured with multiple surface planes at different orientations before deployment. This preliminary configuration provides long-term calibration adaptability without requiring subsequent adjustments or maintenance of complex positioning mechanisms, thereby reducing installation and maintenance costs
Data Source
AI summary
A depth camera calibration device and a method thereof are provided. The method comprises: disabling a projection function of a camera and photographing surface planes to obtain a first image; enabling the projection function of the camera and photographing the surface planes to obtain a second image, and a positional relationship between the camera and a calibration plate assembly remaining unchanged when obtaining the first image and the second image; and obtaining parameters of the camera by cropping an image boundary, calculating positions of characteristic points, reading a projection pattern, calculating positions of corresponding points and excluding abnormal points according to the first image and the second image.