Strain-Based Sensor Extrinsic Calibration for Elastic Electronic Devices

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Solution Overview

Problem

Existing calibration methods for electronic devices with structural elastic deformation are slow and cannot correct extrinsic parameters in real time, particularly for non-image capture devices like depth sensors and gyroscopes, leading to positioning errors during long-term use.

Innovation Solution

An electronic device equipped with strain sensing circuits and a processor that updates external parameters using a linking database, allowing real-time recalibration of extrinsic parameters based on strain sensing values without relying on image analysis from cameras.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If image capture methods are used to calibrate external parameters, then calibration accuracy can be achieved, but the calibration time becomes too long to respond in real time

Engineering Contradiction:

Improvecalibration accuracyVSAvoidcalibration time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the image-based calibration method with a strain sensing-based calibration method. Instead of using cameras to capture images and compute external parameters, the system uses strain sensing circuits to detect deformation and a pre-established linking database to directly obtain calibration parameters, substituting optical measurement with mechanical sensing and database lookup.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent performs preliminary calibration offline by establishing a linking database that stores the correspondence between strain sensing values and external parameters before actual use. During real-time operation, the system only needs to query this pre-established database rather than performing full calibration computations, achieving both accuracy and speed.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If traditional calibration methods are used, then only camera external parameters can be corrected, but other sensing devices like depth sensors and gyroscopes cannot be corrected in real time

Engineering Contradiction:

Improvecoverage of calibrationVSAvoidreal-time response speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent makes the calibration system universal by applying it to multiple types of sensing devices simultaneously. The strain sensing circuits and linking database approach can correct external parameters for cameras, depth sensors, gyroscopes, and other sensing devices in a unified manner, rather than requiring separate calibration methods for each device type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Weight of moving object

If the electronic device uses structural elastic design for thinness and lightness, then the device becomes more flexible and lighter, but the sensing devices become unfixed and relative positions change

Engineering Contradiction:

Improvedevice weightVSAvoidrelative position precision

Core Design Contradiction:

Weight of moving objectVSManufacturing precision

Solution Approach 1:

The patent implements a feedback mechanism where strain sensing circuits continuously monitor the deformation state of the elastic structure, and the processor uses this feedback information to dynamically adjust and correct the external parameters of sensing devices. This closed-loop system compensates for position changes caused by elastic deformation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs self-calibration by automatically detecting its own deformation state through integrated strain sensing circuits and autonomously correcting its parameter values using the linking database, without requiring external calibration equipment or manual intervention.

Inventive Principle:

Principle #25Self-service

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

Enables fast and efficient real-time recalibration of extrinsic parameters, improving operational efficiency and reducing positioning errors by utilizing strain sensing values to update external parameters within the elastic deformation range, and recalibrating with cameras when deformation exceeds the elastic limit.

Implementation Method 1

several strain sensing circuits (130A, 130B) are configured to obtain several strain sensing values in correspondence to a deformation of the electronic device

Methodology Applied

Scientific EffectStrain sensing: Piezoresistive Effect

Data Source

PatentEP4641133B1Electronic device, parameter calibration method, and non-transitory computer readable storage medium

Publication Date: 2026.05.06 HTC CORP

Figure 1
Figure 2
Figure 3A~3B

AI summary

An electronic device is disclosed. The electronic device includes several sensing circuits, several strain sensing circuits, a memory and a processor. The several sensing circuits are configured to obtain several sensing values. The several strain sensing circuits are configured to obtain several strain sensing values. The memory is configured to store a linking database. The linking database includes a linking relationship between several testing strain sensing value groups and several testing external parameter groups in correspondence. The processor is configured to: update several external parameters between the several sensing circuits according to the several strain sensing values and the linking database.