Temperature-Dependent Calibration for 3D Measurement Accuracy
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Solution Overview
Problem
Existing three-dimensional measurement technologies face challenges in maintaining high accuracy due to temperature-induced shifts in camera and projector lens expansions or contractions, which current calibration methods struggle to adequately correct across various temperature changes.
Innovation Solution
An information processing apparatus that decides temperature-dependent parameters for a projection apparatus by using a temperature input unit, a temperature-dependent parameter decision unit, and a holding unit to set temperature-dependent parameters as a temperature function, allowing for accurate calibration and correction of calibration parameters based on measured temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed under discrete temperatures only, then calibration data is obtained at specific temperature points, but accurate calibration cannot be performed across various temperature changes
Solution Approach 1:
The patent applies parameter changes by representing calibration parameters as continuous temperature-dependent functions rather than discrete values. The calibration parameter decision unit calculates parameters at any temperature by evaluating these functions, enabling accurate calibration across the entire temperature range from -20°C to +60°C without requiring calibration at every possible temperature point.
Solution Approach 2:
The patent introduces temperature-dependent calibration parameter functions as intermediaries between discrete calibration measurements and continuous temperature operation. These functions serve as mathematical models that interpolate and extrapolate calibration parameters for temperatures between measured points, bridging the gap between discrete calibration data and continuous operational requirements.
2Measurement precision
If temperature-dependent parameter functions are used, then accurate calibration across all temperatures is achieved, but system complexity increases
Solution Approach 1:
The patent replaces physical mechanical calibration adjustments with mathematical temperature-dependent functions. Instead of mechanically adjusting calibration parameters for each temperature change, the system uses computational evaluation of pre-determined functions to automatically provide accurate calibration parameters, substituting mechanical complexity with mathematical modeling.
Solution Approach 2:
The calibration system performs self-service through automatic temperature compensation. The calibration parameter decision unit automatically selects and calculates appropriate calibration parameters based on the current temperature input, eliminating the need for manual calibration adjustments by operators at different temperature conditions. The system serves itself by autonomously adapting to temperature changes.
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 approach enables high-accuracy three-dimensional measurements by effectively correcting for temperature-induced shifts, ensuring precise calculations of three-dimensional coordinates despite temperature fluctuations.
Implementation Method 1
since a lens of the camera or the projector expands or contracts in accordance with a temperature
Implementation Method 2
a temperature measurement unit configured to measure a temperature of the camera or the projector
Data Source
AI summary
To perform a high-accuracy three-dimensional measurement by performing an appropriate calibration in accordance with various temperature changes, an information processing apparatus that decides a temperature-dependent parameter of a projection apparatus configured to project a pattern onto a measurement target object to perform a three-dimensional measurement includes a holding unit configured to hold a relationship in which the temperature-dependent parameter of the projection apparatus is set as a temperature function, a temperature input unit configured to input a temperature of the projection apparatus, and a temperature-dependent parameter decision unit configured to decide the temperature-dependent parameter of the projection apparatus based on the temperature of the projection apparatus which is input by the temperature input unit and the relationship.