Inertial Measurement Unit Calibration via Pen Stand Orientation
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Solution Overview
Problem
The existing drawing techniques using touch pens with pressure sensors require complex calibration processes, especially when gyro sensors are used, as they necessitate multiple stationary attitudes to account for autorotation and bias components, making the calibration operation cumbersome.
Innovation Solution
An information processing device and method that calibrate an inertial measurement unit based on a single stationary attitude measurement value and the arrangement information, using a pen stand with a specific configuration to maintain a constant positional relationship, allowing for the detection of autorotation and bias components for simplified calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If calibration is performed using angular velocity from one stationary attitude, then calibration process is simplified, but calibration accuracy deteriorates due to inclusion of autorotation and bias components
Solution Approach 1:
The patent segments the calibration process into two distinct phases: (1) obtaining angular velocity data from at least two different stationary attitudes to calculate autorotation and bias components, and (2) performing actual calibration using the corrected data. This segmentation allows the system to separate the harmful autorotation and bias components from the useful calibration signals, thereby maintaining high calibration accuracy while providing a user-friendly single-attitude calibration mode.
Solution Approach 2:
The patent applies preliminary action by pre-calculating the autorotation and bias components during an initial calibration phase that uses multiple stationary attitudes. These pre-calculated correction values are then stored and applied during subsequent single-attitude calibration operations. This preliminary computation enables simplified user operations without sacrificing calibration precision, as the harmful components have already been accounted for in advance.
2Measurement precision
If multiple stationary attitudes are used for calibration, then calibration accuracy is improved, but operational complexity increases
Solution Approach 1:
The patent divides the calibration system into two functional segments: a calibration setup phase that performs complex multi-attitude measurements and calculations, and an operational phase that uses the pre-computed correction data for simple single-attitude calibration. This segmentation concentrates the complexity in an initial setup that needs to be performed only once, while subsequent operations remain simple and user-friendly.
Solution Approach 2:
The patent performs the complex multi-attitude calibration and autorotation/bias component calculation as a preliminary action that establishes correction parameters in advance. Once these parameters are determined, all subsequent calibration operations can proceed with simple single-attitude measurements, dramatically reducing the operational complexity while maintaining high accuracy through the pre-computed corrections.
3Manufacturing precision
If pressure sensor calibration is performed, then drawing accuracy is improved, but calibration time increases
Solution Approach 1:
The patent performs the time-consuming multi-attitude calibration and autorotation/bias component calculation as a preliminary action that needs to be done only once during initial setup or when correction values need updating. The computed correction parameters are then stored and reused for numerous subsequent drawing operations, dramatically reducing the calibration time required for each drawing session while maintaining high drawing accuracy through the persistent correction data.
Data Source
AI summary
Provided is an information processing device and an information processing method that enable simple and appropriate calibration. When a pen-type device incorporating an inertial measurement unit such as an IMU is moved and a drawn image corresponding to a track is displayed, calibration is implemented on the basis of a measurement value of the inertial measurement device in one stationary attitude and a latitude and an absolute azimuth of the inertial measurement device at that time when the pen-type device is inserted into a pen stand to be fixed in a predetermined direction.