Elevator Door Detection Using Camera-Based Image Processing
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Solution Overview
Problem
Existing elevator passenger detection systems using photoelectric sensors often issue false alarms and require fine adjustment to prevent detection errors, especially in center open type doors where sensors need to be installed for both door pockets.
Innovation Solution
An elevator passenger detection system that includes an image capturing unit, a detection area setting unit, and a detection processing unit, where a camera captures images of the doorway area and sets detection areas on the inner side surfaces of the doorway panels to accurately detect passengers or objects, using methods such as difference detection, motion detection, and boundary detection to prevent accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photoelectric sensors are installed near door pockets to detect passengers, then safety against door accidents is improved, but false alarms increase and require fine adjustment of installation position
Solution Approach 1:
The patent replaces mechanical photoelectric sensors with a camera-based image processing system. The camera captures images of the doorway area, and detection areas are set on the inner side surfaces of doorway panels through image processing. This substitution eliminates the need for precise mechanical sensor positioning while maintaining detection accuracy, as the system can digitally define detection zones without physical adjustment.
2Reliability
If photoelectric sensors are installed for both door pockets in center open type doors, then coverage of detection areas is improved, but device complexity increases
Solution Approach 1:
The patent employs a single camera system that serves multiple detection functions for both door pockets simultaneously. The image capturing unit captures the entire doorway area, and the detection processing unit sets and monitors multiple detection areas on different doorway panels using the same camera feed. This multi-functional approach replaces multiple specialized sensors with one versatile imaging system, reducing overall device complexity while maintaining comprehensive coverage.
Data Source
AI summary
According to one embodiment, an elevator passenger detection system comprises an image capturing unit, a detection area setting unit, and a detection processing unit. The image capturing unit captures an image in a predetermined range including a vicinity of a doorway at which a door is opened or closed, from an inside of a car. The detection area setting unit sets a detection area on a front return panel provided on at least one of sides of a doorway of the car, on the captured image obtained by the image capturing unit. The detection processing unit detects presence of a passenger or an object, based on the image in the detection area set by the detection area setting unit.