Reflector-Assisted Projector–Camera Calibration for Information Projection
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Solution Overview
Problem
Existing systems face accuracy issues in calibrating the positional relation between a camera and a projector due to disturbances caused by changes in the position and shape of objects during work, leading to decreased estimation accuracy.
Innovation Solution
A work information projection system that uses a reflector to capture a calibration image projected by the projector, allowing the camera to face a direction different from the projector, thereby reducing disturbances and enhancing calibration accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the camera captures the image projected by the projector directly, then the calibration process can be performed, but the position and shape of objects in the captured image change as work progresses, causing disturbances and decreasing estimation accuracy
Solution Approach 1:
A reflector is introduced as an intermediary component between the projector and camera. The projector projects calibration images onto the reflector, and the camera captures the reflected images. This intermediary setup allows the camera to be positioned at an angle significantly different from the projector's direction, enabling calibration while avoiding disturbances from changing work objects in the direct field of view.
2Ease of operation
If the camera is positioned to capture the projected image directly, then calibration can be performed, but the camera must face the same direction as the projector, limiting system flexibility
Solution Approach 1:
The system transitions from a one-dimensional alignment (camera and projector facing the same direction) to utilizing angular/directional dimensions. By employing the reflector, the camera can be positioned at significantly different angles from the projector, adding directional flexibility to the system while maintaining calibration capability.
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 achieves high accuracy in projecting auxiliary images at precise positions by minimizing disturbances in the camera's captured images, even in environments with few feature points.
Implementation Method 1
the camera captures a calibration image projected by the projector onto a calibration jig through a reflector
Data Source
AI summary
A work information projection system (1) includes a projector (12), a camera (14), and a controller. The projector (12) projects an auxiliary image (101) onto a workplace. The camera (14) captures the workplace. During a work, the controller controls the projector (12) based on a position of the projector (12) to project the auxiliary image onto the workplace. During a calibration process of calibrating relative information, the camera (14) captures a calibration image projected by the projector (12) onto a calibration jig (32) through a reflector (15). The controller performs the calibration process of calibrating the relative information based on the calibration image captured by the camera (14).