3D Video Tripwires Using Depth Camera Coordinates
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Solution Overview
Problem
Current video tripwire systems in surveillance rely on two-dimensional coordinates, leading to ambiguity and potential false alarms due to the lack of depth information, as they are projections of a three-dimensional world onto a two-dimensional image plane.
Innovation Solution
The use of depth information from depth cameras to create and monitor three-dimensional video tripwires, allowing users to define and track objects in three-dimensional coordinates, thereby eliminating false alarms by accurately determining when an object crosses a user-defined three-dimensional line or plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 2D video tripwires are used for object detection, then the system is simple to implement, but false alarms increase due to depth ambiguity
Solution Approach 1:
The patent transitions from 2D video tripwires to 3D video tripwires by incorporating depth information from depth cameras. This dimensional change allows the system to accurately distinguish objects at different depths, eliminating false alarms caused by depth ambiguity while maintaining system simplicity through integrated depth sensing.
Solution Approach 2:
The patent introduces depth information as an intermediary element that mediates between the video camera and the tripwire detection system. By using depth maps generated from structured light or time-of-flight cameras, the system gains accurate depth perception without requiring complex multi-camera setups or manual calibration.
2Reliability
If depth cameras are used to create 3D tripwires, then false alarms are reduced, but system cost and complexity increase
Solution Approach 1:
The patent adds the depth dimension to traditional 2D video surveillance by integrating depth cameras. This enables the creation of 3D tripwires that accurately represent spatial boundaries, significantly improving detection reliability while the unified 3D processing framework keeps implementation complexity manageable.
Solution Approach 2:
The patent makes the surveillance system multi-functional by using the depth camera for both 3D tripwire detection and general scene understanding. The depth information serves multiple purposes including tripwire definition, object tracking, and spatial relationship analysis, maximizing the utility of the additional hardware.
3Measurement precision
If 2D coordinates are used for tripwire definition, then the system is easy to operate, but measurement precision decreases
Solution Approach 1:
The patent extends tripwire definition from 2D image coordinates to 3D spatial coordinates by incorporating depth information. Users can define tripwires in 3D space using intuitive point-and-click interfaces, and the system automatically converts these definitions into accurate 3D boundary representations for precise object position measurement.
Solution Approach 2:
The patent uses depth maps as an intermediary to bridge between user-friendly 2D interface operations and precise 3D measurements. When users select points on the 2D display, the system retrieves corresponding 3D coordinates from the depth map, enabling easy operation without sacrificing measurement precision.
Data Source
AI summary
A method of processing a digital video sequence is provided that includes detecting a foreground object in an image captured by a depth camera, determining three-dimensional (3D) coordinates of the foreground object, and comparing the 3D coordinates to a 3D video tripwire to determine if the foreground object has crossed the 3D video tripwire. A method of defining a 3D video tripwire is also provided.