Shoe Threat Detection Using Segmented Metal Detector Scanning
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Solution Overview
Problem
Current security screening systems at restricted access areas, such as airports, face inefficiencies due to false positives from metal in shoes, leading to delays and inconvenience, as they require individuals to remove and re-scan shoes, exposing passengers to radiation and causing discomfort, especially for those with mobility issues.
Innovation Solution
A method and system that uses a metal detector to rapidly assess pairs of shoes for potential threats by comparing initial and subsequent responses, allowing only critical shoes to be individually scanned, reducing delays and maintaining effective threat detection without additional discomfort or radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full-body metal detector scans the entire body of an individual, then security coverage is improved, but false positives from metal in shoes increase leading to additional scanning delays
Solution Approach 1:
The patent divides the shoe scanning process into two independent stages: first scanning the left shoe, then scanning the right shoe. This segmentation allows the system to process one shoe at a time, reducing the cumulative false positive effect and enabling more efficient threat detection without requiring the passenger to remove both shoes simultaneously.
Solution Approach 2:
The patent performs a preliminary scan of shoes using the metal detector before proceeding to full body scanning. By detecting and flagging metal objects in shoes in advance, the system can prepare for targeted manual inspection of specific shoes, reducing overall processing time and avoiding unnecessary full-body rescans.
2Measurement precision
If passengers are required to remove their shoes for scanning, then detection accuracy is improved, but convenience and processing speed deteriorate
Solution Approach 1:
The patent enables passengers to keep their shoes on during the metal detection scan by using a scanning method that does not require shoe removal. The system processes shoes in their worn position, allowing passengers to maintain their footwear throughout the automated scanning process, thus preserving convenience while achieving detection accuracy.
3Reliability
If X-ray scanning is used to scan all passengers' shoes, then threat detection capability is improved, but health safety deteriorates due to ionizing radiation exposure
Solution Approach 1:
The patent replaces X-ray scanning with a metal detector-based electromagnetic sensing system for initial shoe screening. This substitution eliminates ionizing radiation exposure while maintaining effective threat detection capability for metallic objects, allowing passengers to keep shoes on during scanning and reducing health risks associated with radiation.
4Measurement precision
If the detector performs cumulative sensing of multiple unarm metallic objects in shoes, then detection sensitivity is improved, but false positive rate increases leading to repetitive scans
Solution Approach 1:
The patent segments the shoe scanning process into independent left-shoe and right-shoe scans. By processing each shoe separately rather than cumulatively sensing both shoes together, the system reduces false positives caused by multiple unarm metallic objects in the same shoe pair, while maintaining detection sensitivity for individual threats.
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 the flow of individuals through security access points by reducing the need for double scanning, minimizing delays, and reducing false positives, while being compatible with existing security infrastructure and avoiding additional costs.
Implementation Method 1
obtaining a first response provided by a first metal detector (11) by sensing the pair of shoes (21, 22)
Data Source
AI summary
The invention concerns a method and a system (1) for detecting a threat in a shoe (21, 22) worn by an individual (2) accessing a restricted access area (50) through a security access point (51). The method comprises obtaining a first response provided by a first metal detector (11) by sensing a pair of shoes worn by the individual. The first response is compared with a signature signal representing a shoe comprising a threat or an object representing a threat so to indicate a critical pair of shoes. In such case, the method further comprises prompting the individual to place the critical pair of shoes at a predefined position to obtain a second response provided by the first or by a second metal detector (12, 13) by sensing one shoe of said critical pair of shoes. A potential threat is detected by comparing the second response with the signature signal.