Video-Enabled EAS Detection System for False Alarm Reduction
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Solution Overview
Problem
Existing electronic article surveillance (EAS) systems often trigger false alarms when an item with an activated tag is near the exit but not actually exiting the store, due to the large interrogation zone covering areas outside the immediate exit area, and may fail to detect items exiting undetected if the gain is too low.
Innovation Solution
A method and system that incorporates a video camera and controller to determine if an object with an activated EAS or RFID tag is within a surveillance detection zone, initiating an alarm only when the object is present within the zone after detecting the tag, thereby preventing false alarms and ensuring detection of items exiting the monitored area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain of the EAS receiver and/or transmitter is increased to expand the detection range, then the detection capability is improved, but false alarms increase due to detection in the over-range region
Solution Approach 1:
The patent divides the detection space into two distinct zones: an interrogation zone for detecting EAS tags and a surveillance detection zone for confirming object presence. This segmentation allows the system to maintain high gain for tag detection while requiring additional confirmation in a smaller, more precise zone, thereby reducing false alarms from over-range detection.
Solution Approach 2:
The patent introduces video confirmation as an intermediary step between tag detection and alarm triggering. The video camera acts as a mediator that verifies whether an object is actually present in the surveillance detection zone, providing additional validation that prevents false alarms while maintaining reliable detection capability.
2Object-generated harmful factors
If the gain of the EAS receiver and/or transmitter is decreased to reduce false alarms, then false alarms are reduced, but detection capability deteriorates causing undetected exits
Solution Approach 1:
By segmenting the detection process into tag detection and object confirmation stages, the system can use lower gain settings that reduce false alarms while maintaining reliable detection through the added video confirmation step in the surveillance detection zone.
Solution Approach 2:
The video confirmation system serves as an intermediary that compensates for reduced transmitter/receiver gain. Even with lower gain settings, the system maintains detection reliability because the video camera provides independent verification of object presence, ensuring that legitimate exits are not missed.
3Area of stationary object
If the interrogation zone is expanded to cover a larger area, then the detection coverage is improved, but the precision of determining actual exit is reduced
Solution Approach 1:
The patent segments the detection zones into a larger interrogation zone for broad coverage and a smaller surveillance detection zone for precise exit determination. This hierarchical segmentation allows the system to maintain both wide detection coverage and high precision for determining actual exits.
Solution Approach 2:
The patent adds a temporal dimension to the detection process by requiring that an object be present in the surveillance detection zone for a predetermined time period after tag detection. This time-based verification enhances precision by filtering out transient detections while maintaining broad spatial coverage.
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
The system effectively reduces false alarms by confirming the presence of an object within the surveillance detection zone before triggering an alarm, ensuring that only valid exits trigger alerts and preventing undetected exits, thus optimizing the detection area and operational efficiency.
Implementation Method 1
Articles to be protected from removal are tagged with an EAS marker that, when active, generates an electromagnetic response signal when passed through this interrogation zone. An antenna and receiver in the same or another 'pedestal' detects this response signal and generates an alarm.
Implementation Method 2
A video camera captures images of objects within a surveillance zone.
Data Source
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AI summary
A security system and method is provided that uses an auxiliary sensor, such as a video camera, to verify the presence of an object within a part of an interrogation zone. The presence of an activated security system tag in an interrogation zone is detected. The system also determines whether an object is in a surveillance detection zone when the activated security system tag is detected. An alarm is initiated if the object is in the surveillance detection zone within a predetermined time after the activated security system tag is detected in the interrogation zone. The alarm may be based on the direction of motion of the object in the surveillance zone.