Forehead Temperature Sensing With Distance and Area Calibration
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Solution Overview
Problem
Current auto forehead temperature measuring systems suffer from inaccuracies due to variable distances between the measured person and the system, environmental temperature fluctuations, and false alarms resulting from these factors.
Innovation Solution
A forehead temperature measurement system utilizing an image sensor and thermal sensor to determine a temperature measuring range, calibrate forehead temperatures based on forehead area and environmental temperature, and adjust field of view to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed field of view is used for temperature measurement, then the system structure is simple, but measurement accuracy degrades when the measured person is at a farther distance
Solution Approach 1:
The patent implements a dynamic field of view adjustment mechanism that adapts the measurement range based on the detected distance to the measured person. When the person is farther away, the system expands the field of view to capture sufficient thermal data, and when closer, it narrows the field of view for higher precision. This dynamic adaptation resolves the contradiction between maintaining simple structure and achieving accurate measurements across varying distances.
Solution Approach 2:
The system changes the field of view parameter dynamically based on distance detection results. By adjusting this key parameter according to real-time conditions, the system optimizes measurement accuracy without requiring multiple fixed-configuration systems, thus balancing simplicity and precision.
2Measurement precision
If environmental temperature fluctuation is not compensated, then the measurement system remains simple, but temperature deviation increases
Solution Approach 1:
The patent incorporates an environmental temperature detection mechanism that continuously monitors surrounding thermal conditions and feeds this information back to the calibration system. The system uses this feedback to dynamically adjust and compensate for environmental influences on the temperature measurement, thereby maintaining high accuracy without requiring complex hardware modifications.
Solution Approach 2:
The system introduces an intermediary calibration process that acts as a mediator between the raw thermal sensor output and the final temperature reading. This calibration layer compensates for environmental temperature fluctuations by comparing reference measurements with actual readings, effectively isolating the measurement system from environmental interference.
3Reliability
If distance variation is not compensated, then the system operation remains simple, but false alarm rate increases
Solution Approach 1:
The patent implements preliminary distance detection and compensation calculations before final temperature determination. By pre-assessing the distance to the measured person and applying appropriate compensation factors in advance, the system eliminates distance-related measurement errors before they can cause false alarms, thereby improving reliability without requiring complex real-time correction mechanisms during measurement.
4Measurement precision
If forehead area calibration is not applied, then the processing speed remains fast, but measurement accuracy decreases
Solution Approach 1:
The patent applies partial calibration by focusing computational resources on the specific forehead region rather than processing the entire thermal image. By identifying and calibrating only the relevant forehead area using image recognition boundaries, the system achieves high measurement accuracy while minimizing processing overhead and maintaining fast operation speeds.
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
Enhances measurement accuracy by compensating or calibrating forehead temperatures, reducing false alarms, and ensuring precise temperature readings.
Implementation Method 1
a thermal sensor that outputs a thermal image
Data Source
AI summary
There is provided a forehead temperature measurement system including an image sensor, a thermal sensor and a processor. The image sensor is used to output an image frame. The thermal sensor is used to output a thermal image. The processor is used to determine a forehead region in the image frame, map the forehead region to the thermal image and identify a forehead temperature according to a forehead mapped region in the thermal image. The processor further calibrates or compensates the forehead temperature according to an area of the forehead region.