Depth Map Head Detection for Access Control Safety
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Solution Overview
Problem
Existing access control systems in transportation networks face challenges in accurately detecting people and objects, leading to accidents due to untimely door closures, increased fraud risks, and reduced passage fluidity, particularly with individuals accompanied by children, carrying large items, or pushing strollers, as well as issues with 'tailgating' where multiple people pass together.
Innovation Solution
A method utilizing a depth map analysis by an optical sensor to detect the head and shoulders of individuals, with ellipse fitting and similarity scoring to differentiate between people and objects, ensuring accurate detection and authorization, and an access control system incorporating this method for controlled door operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of cells in the boxes is increased to improve detection accuracy and safety, then the risk of accidents and fraud is reduced, but the device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/optical system of multiple light beam cells with an electronic image processing system. A single camera captures images of the corridor, and software algorithms analyze the images to detect persons and objects, eliminating the need for multiple physical cells while achieving superior detection accuracy through pixel-level analysis.
Solution Approach 2:
The image processing system performs multiple functions simultaneously: it detects persons, distinguishes between persons and objects (such as backpacks or strollers), monitors corridor occupancy, and provides fraud detection capabilities, all through a single multi-functional system rather than separate specialized cells.
2Reliability
If the opening time of the door is increased to prevent accidents with children or objects, then safety is improved, but the risk of fraud increases and passage fluidity decreases
Solution Approach 1:
The door opening duration is made dynamic rather than static. The system continuously monitors the corridor through image capture and automatically adjusts the door opening time based on real-time detection of persons and objects. The door remains open as long as persons or relevant objects are detected in the corridor, and closes automatically when the corridor is clear, optimizing both safety and passage efficiency.
Solution Approach 2:
The system implements continuous feedback by capturing images during door opening, analyzing them to detect persons and objects, and using this information to control door closure timing. This closed-loop control ensures the door remains open until it is safe to close, preventing accidents while maintaining passage fluidity through automatic timing adjustment.
3Ease of manufacture
If the number of cells is limited for economic reasons, then cost is reduced, but detection accuracy decreases leading to accidents and fraud
Solution Approach 1:
The patent replaces expensive mechanical/optical cell systems with a cost-effective electronic imaging system. A single camera provides comprehensive coverage of the corridor, and software processing delivers high-resolution detection capabilities that would require numerous expensive cells to achieve through traditional means.
Solution Approach 2:
The system uses digital image copying and processing to achieve detailed detection. The camera captures a complete visual copy of the corridor scene, and software algorithms analyze this digital copy to detect persons and objects with high precision, eliminating the need for multiple physical sensing cells.
4Productivity
If more parallel corridors are added to maintain passage fluidity when increasing door opening time, then passage capacity is maintained, but the device complexity and space requirements increase
Solution Approach 1:
The system maintains passage fluidity through dynamic door control rather than increasing physical infrastructure. By continuously monitoring the corridor and automatically adjusting door opening duration based on real-time detection, the system optimizes throughput without requiring additional parallel corridors.
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 enhances safety by preventing accidents and fraud, maintaining passage fluidity, and accurately differentiating between individuals and objects, ensuring the door only closes after the person has fully passed through, thereby improving the overall operational safety and security of access control systems.
Implementation Method 1
an optical sensor, comprising a step for detecting the head and shoulders of any people who may be present in the depth map to be analyzed
Data Source
AI summary
The invention relates to a method for detecting persons and/or objects in a space using a depth map to be analyzed, comprising a step for detecting the head and shoulders of any people who may be present in the depth map to be analyzed.