Vehicle-Mounted Illuminance Measurement with Speed Correction
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Solution Overview
Problem
Existing spatial light measuring systems are complex and limited to measuring illuminance in tunnels, requiring reflectors on walls and specific configurations, which restrict their applicability to other environments like open spaces.
Innovation Solution
A spatial light measuring method and system that uses a vehicle-mounted illuminance measuring instrument and image pickup device, along with a speedometer and arithmetic device, to acquire initial and daily management data, correcting for distance and speed to assess illuminance and image data, allowing for simple and effective evaluation of illumination facilities in various environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a special photosensor, reflector, and position detecting light sensor are used to measure illuminance in tunnels, then measurement precision is improved, but device complexity increases and adaptability to other environments deteriorates
Solution Approach 1:
The patent extracts the essential measurement function from the complex tunnel-specific system. By using a mobile device with a camera and simplified illuminance sensor, it removes the need for special photosensors, reflectors, and position detecting sensors, thereby reducing device complexity while maintaining measurement capability through alternative means (image processing and standard sensors).
Solution Approach 2:
The patent creates a universal measuring apparatus that can operate in multiple environments (tunnels, open spaces, roads) using standard components. The mobile device with camera and illuminance sensor can measure illuminance anywhere, eliminating the need for environment-specific configurations like tunnel reflectors, thus improving adaptability while reducing complexity.
2Measurement precision
If reflectors are installed on wall surfaces to specify illumination lamp positions, then measurement precision is improved, but ease of operation deteriorates due to limited applicability
Solution Approach 1:
The patent removes the requirement for installable reflectors on wall surfaces. Instead of using physical reflectors to mark positions, it uses image processing technology to automatically detect and specify illumination lamp positions from camera images, eliminating the operational complexity of reflector installation and improving ease of operation across different environments.
Solution Approach 2:
The patent replaces the mechanical/reflection-based position specification system with an optical/electronic image processing system. The camera captures images and computer vision algorithms automatically identify lamp positions, substituting the need for physical reflectors and manual position marking, thereby improving ease of operation and adaptability.
3Ease of operation
If a mobile device with camera and illuminance sensor is used for daily management measurement, then ease of operation is improved, but measurement precision may deteriorate due to distance from ground
Solution Approach 1:
The patent applies parameter changes by correcting illuminance measurement values based on the distance between the mobile device and the ground. The system adjusts the measured illuminance data according to the vertical position parameter, compensating for the reduced accuracy caused by distance, thereby maintaining measurement precision while preserving the ease of operation provided by mobile device portability.
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 efficient daily management of illumination facilities without interrupting traffic, allowing for easy judgment of illuminance changes and necessary replacements, improving maintenance reliability and planning.
Implementation Method 1
acquiring initial data on the ground in a state where the illumination facility is new by an illuminance measuring instrument in a running direction of a traveling vehicle
Implementation Method 2
acquiring an image including an illumination facility
Data Source
AI summary
A spatial light measuring system is disclosed, which is configured to store illuminance data acquired by measurement in a new state as initial data, to make the traveling vehicle run after acquiring the initial data, to save illuminance data acquired by the illuminance measuring instrument as daily management data, and to specify an illuminance measuring position and an image acquiring position based on the speed of the traveling vehicle and to use a correction coefficient due to a distance from the ground to an illuminance measuring instrument mounting position and a correction coefficient due to the speed of the traveling vehicle and is configured to correct daily management data into illuminance data on the ground based on both the correction coefficients and to judge the soundness of the illumination facility based on a comparison between the illuminance data as corrected, the initial data and based on the images as acquired.