Scanning Camera Motion Detection False Alarm Reduction
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Solution Overview
Problem
Motion detection with scanning cameras suffers from high false alarm rates due to factors like camera imperfections and short detection times, which are exacerbated by the need for fast scanning to avoid missing moving objects, leading to reduced system area coverage.
Innovation Solution
Implementing a method that involves preliminary fast detection followed by verification and analysis, either by pausing the scan or slowing it down, and optionally using a secondary camera to confirm motion, ensuring that detected motion is kept within the camera's field of view for thorough analysis before reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scan speed is increased to improve area coverage rate, then productivity is improved, but the detection time is reduced causing higher false alarm rates
Solution Approach 1:
The patent segments the motion detection process into two distinct phases: a fast scanning phase for initial detection and a verification phase for confirmation. This segmentation allows the system to maintain high scanning speeds for area coverage while dedicating specific time periods to thorough analysis, thereby reducing false alarms without sacrificing productivity
Solution Approach 2:
The patent implements preliminary fast scanning to detect potential motion events before conducting detailed verification. This preliminary action enables the system to identify candidates for further analysis while maintaining high scanning speed, and then applies slower verification only when necessary, optimizing both productivity and reliability
2Reliability
If the scan speed is decreased to increase detection time, then reliability is improved, but productivity is reduced
Solution Approach 1:
The patent employs dynamic scanning speed adjustment, transitioning between fast scanning mode and slow verification mode based on detection needs. The system scans quickly during normal operation to maintain high productivity, then automatically slows down when motion is detected for thorough verification, achieving both high detection accuracy and maintained productivity
Solution Approach 2:
The patent implements periodic verification cycles where fast scanning is interrupted by slower verification phases when motion events occur. This periodic alternation between high-speed coverage and detailed analysis allows the system to maintain overall high productivity while ensuring reliable detection when needed
3Productivity
If the scanning continues without pause to maintain fast area coverage, then productivity is maintained, but false alarms increase due to insufficient analysis time
Solution Approach 1:
The patent incorporates feedback mechanisms where motion detection triggers a verification process. The system continuously monitors for motion events and provides feedback by pausing scanning to verify detected motions, ensuring that false alarms are filtered out while maintaining fast scanning coverage for non-event periods
Solution Approach 2:
The patent performs preliminary fast scanning to detect motion events, then pauses for verification only when necessary. This preliminary detection approach allows the system to maintain high productivity during normal scanning while initiating detailed analysis only when potential events are detected, reducing false alarms without sacrificing overall area coverage rate
Data Source
AI summary
A method and a system for false alarm reduction in motion detection by scanning cameras. A method for reducing false alarms in scanning camera facilitated motion detection of an object, includes: setting a camera to observe a predefined area; continuously or non-continuously scanning by the camera of the said area for any motion; pausing the camera's scanning if a new motion is detected; analyzing the motion if it has not disappeared, while keeping the object within the camera's field of view; providing an alarm and possibly showing the motion if a motion that should be reported is obtained; and tracking the motion for a period of time at the discretion of the operator.