Dynamic Lighting Sensitivity Adjustment for Detection Accuracy
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Solution Overview
Problem
Existing lighting systems using image sensors for detecting individuals have low detection performance and comfort issues due to misrecognition and low dimming rates, especially when individuals maintain static postures, leading to difficulty in detecting slight movements and decreased visibility.
Innovation Solution
A lighting system with a sensing device that includes an image sensor and a controller to adjust sensitivity and dimming rates dynamically, decreasing dimming rates and increasing sensitivity when no person is detected for a predetermined time, and vice versa, to enhance detection accuracy and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the threshold for determining the difference is decreased to increase detection sensitivity, then detection sensitivity is improved, but the light output change of the lighting fixture is likely to be determined as the difference causing misrecognition
Solution Approach 1:
The patent applies dynamics by making the threshold value adjustable rather than fixed. The control device dynamically changes the threshold value based on the dimming rate: when the dimming rate is low (indicating potential misrecognition), the threshold is increased to filter out false detections; when the dimming rate is high (normal operation), the threshold is decreased to improve detection sensitivity. This dynamic adjustment resolves the contradiction between detection sensitivity and misrecognition rate.
Solution Approach 2:
The patent changes the parameter of the threshold value based on the dimming rate parameter. By establishing a relationship between these two parameters, the system adapts the detection threshold to the current lighting conditions, thereby maintaining high detection sensitivity while reducing misrecognition caused by light output changes.
2Measurement precision
If the dimming rate for the lighting fixture is decreased to improve detection performance, then detection accuracy is improved, but visibility for a person is decreased causing loss in comfort
Solution Approach 1:
The patent applies dynamics by making the dimming rate adjustable based on detection results. When a person is detected, the system dynamically increases the dimming rate to improve visibility and comfort. When no person is detected or detection confidence is low, the dimming rate is decreased to improve detection accuracy. This dynamic adjustment resolves the contradiction between detection accuracy and visibility.
Solution Approach 2:
The system uses feedback from the image sensor detection results to adjust the dimming rate. The control device continuously monitors detection outcomes and adjusts lighting levels accordingly, creating a closed-loop control system that balances detection performance with user comfort and visibility requirements.
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
Improves detection accuracy and comfort by adjusting sensitivity and dimming rates based on presence or absence of individuals, minimizing false detections and maintaining visibility, thus enhancing the overall performance of the image sensor.
Implementation Method 1
The image sensor 10 detects reflected light derived from light emitted from the lighting fixture 20 by use of light sensing devices arranged in a two-dimensional manner, and creates a two-dimensional image by means of converting the intensity of detected light into a brightness data.
Data Source
AI summary
The lighting system in accordance with the present invention includes a lighting fixture including a first controller configured to control a light source; and a sensing device. The sensing device includes: an image sensor configured to take an image of a predetermined area; and a second controller having a function of adjusting sensitivity of the image sensor and a function of setting a dimming rate for the light source. The first controller is configured to light the light source at a dimming level according to the dimming rate set by the second controller. The second controller is configured to, when concluding that a condition where no person is present in the predetermined area continues for a predetermined time period, perform an operation of decreasing the dimming rate by a preset value and increasing the sensitivity of the image sensor for a preset time period.