Video Surveillance 3D Tripwire Detection Against Perspective False Alarms
Solution Overview
Problem
Existing video surveillance techniques using tripwires are prone to false alarms due to perspective effects, leading to inaccurate detection of object movement across the tripwire.
Innovation Solution
A system and method that utilizes 3D coordinate determination and event analysis based on video and image processing to accurately identify objects and their movement relative to defined reference zones, reducing false alarms by considering the 3D spatial relationship between targets and tripwires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If tripwire detection is used to identify object movement, then the detection method is easy to implement, but false alarms are generated due to perspective effects
Solution Approach 1:
The patent transitions from 2D tripwire detection to 3D spatial detection by calculating depth information and three-dimensional coordinates of targets. This dimensional change allows the system to distinguish between actual intrusions and false alarms caused by perspective effects, resolving the contradiction between ease of implementation and detection accuracy.
Solution Approach 2:
The patent changes the detection parameters from simple 2D coordinate intersection to 3D spatial relationship analysis. By calculating depth values and three-dimensional positions, the system transforms the detection parameters to eliminate false alarms while maintaining implementation feasibility through automated computation.
2Device complexity
If direct determination of target intersection with tripwire is used, then the detection process is simple, but inaccurate detection occurs due to perspective effects
Solution Approach 1:
The patent introduces 3D spatial coordinates and depth information to the detection process, transforming it from a simple 2D intersection check to a more accurate 3D spatial relationship analysis. This resolves the contradiction by improving measurement precision while the automated calculation methods keep the overall system complexity manageable.
Solution Approach 2:
The patent introduces intermediate calculations including depth information, three-dimensional coordinate transformation, and spatial relationship analysis as mediators between the target and tripwire. These intermediaries enable accurate detection by providing additional spatial context without requiring overly complex direct measurement methods.
Data Source
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AI summary
A system for video surveillance includes an image sensor configured capture an image including a reference zone and a memory device that stores instructions. The system also includes one or more processors that are configured to execute the instructions to determine 3D coordinates of a target comprised in the image and determine 3D coordinates of the reference zone. The one or more processors are further configured to identify an event according to the 3D coordinates of the target and the 3D coordinates of the reference zone.