Projection Calibration via Image-Capturing Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Infrared interactive projection systems face inaccuracies in calibration due to manual calibration methods, leading to errors in calculating image size and resolution.
Innovation Solution
An image-capturing device with a processing unit, storage unit, and filtering element that captures and analyzes a calibration pattern to establish a coordinate conversion table, automatically converting imaging coordinates into projecting coordinates without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual calibration method is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The image-capturing device performs automatic calibration by capturing the calibration pattern and processing unit automatically converts coordinates without requiring manual intervention. The system serves itself by using the captured image to determine calibration parameters and establish coordinate conversion tables, eliminating the need for user-based manual calibration while maintaining high precision.
Solution Approach 2:
The patent replaces the manual mechanical calibration process with an automated optical and computational system. Instead of manual touching or marking, the system uses image capture and digital image processing to automatically determine calibration points and compute coordinate transformations, substituting manual operations with automated optical-mechanical and computational processes.
2Measurement precision
If automatic calibration method is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The image-capturing device performs multiple functions: it captures images during normal operation and automatically performs calibration when needed. The processing unit handles both regular image processing and calibration computations. By making the calibration capability universal within the existing device framework, the system avoids adding separate dedicated calibration hardware, thus limiting the increase in device complexity.
Solution Approach 2:
The calibration pattern is projected in advance before actual use, and the image-capturing device captures this pattern to pre-establish the coordinate conversion table. This preliminary calibration action allows the system to be ready for accurate operation without requiring complex real-time calibration procedures during actual use, simplifying the overall system architecture.
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 method achieves accurate calibration results by automatically converting touch locations into corresponding coordinates on the projection device, reducing errors associated with manual calibration.
Implementation Method 1
a lens configured to image the calibration pattern on the image sensing device
Implementation Method 2
a filtering element configured to adjust an acceptable light wavelength range received by the image sensing device
Data Source
AI summary
An image-capturing device and a projection automatic calibration method of a projection device are provided. The image-capturing device includes an image sensing device, a lens, a processing unit and a storage unit. The lens is configured to image a calibration pattern on the image sensing device. The processing unit is configured to issue a projection calibration requirement and analyze the calibration pattern imaged on the image sensing device to obtain information relating to the calibration pattern, and the processing unit is further configured to convert imaging coordinates of the calibration pattern imaged on the image sensing device into projecting coordinates of the projection device by executing a calibration driving program to establish a coordinate conversion table. The storage unit is configured to store the calibration driving program and the coordinate conversion table.