Portable Device Camera-Accelerometer Calibration Without Lab Setup
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Solution Overview
Problem
Existing calibration methods for portable electronic devices require complex and costly laboratory setups, specialized equipment, and trained personnel, making them impractical for widespread use, and manufacturer-provided parameters may be inaccurate.
Innovation Solution
A user-assisted calibration method using a known pattern and image acquisition module, allowing untrained users to determine device parameters by moving the device to different positions and processing images, leveraging sensors like accelerometers and magnetic sensors for accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laboratory calibration methods are used, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses a digital copy of the calibration pattern displayed on a screen instead of a physical metrological artifact. The image acquisition module captures images of this digital pattern, and the processing unit calculates device parameters by comparing captured images with the known digital pattern. This eliminates the need for complex physical calibration equipment while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces mechanical/optical metrological equipment with computational methods. Instead of using specialized optical benches, precision mirrors, and calibrated artifacts, the system uses image processing algorithms to determine device parameters. The processing unit calculates intrinsic and extrinsic parameters through mathematical operations on captured images, substituting physical measurement systems with computational analysis.
2Ease of operation
If manufacturer-provided parameters are used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The portable electronic device performs self-calibration by capturing images of a known digital pattern and automatically calculating its own intrinsic and extrinsic parameters. The processing unit executes calibration algorithms using the device's own image acquisition module, eliminating the need for external laboratory calibration services or manual parameter entry from manufacturer documentation.
3Measurement precision
If individual laboratory calibration of each device is performed, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The calibration pattern and methodology are universal and can be used with any portable electronic device having an image acquisition module. The same digital pattern displayed on any screen can serve as the calibration target for any device, eliminating the need for device-specific calibration procedures. This universal approach enables rapid calibration of multiple devices without requiring specialized equipment for each unit.
Data Source
AI summary
A calibration method for determining angles between an image acquisition module reference frame and an accelerometer reference frame of a portable electronic device, comprising receiving a set of images of a known pattern from the image acquisition module from different positions, the known pattern being in the same spatial position when acquired, and each image being associated with a gravity data corresponding to the measurement of the gravity by the accelerometer expressed in the accelerometer reference frame, determining the angles between the image acquisition module reference frame and the known pattern reference frame based on the received pictures of the set of pictures, determining the angles between the image acquisition module reference frame and the accelerometer reference frame based on the determined angles between the image acquisition module reference frame and the known pattern reference frame and assuming the gravity measured by the accelerometer is the same for each image.