Camera Warning Systems Using 3D Coordinates for Intrusion Detection
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Solution Overview
Problem
Conventional single-camera alarm systems misjudge intrusion due to limited judgment of the relationship between object and warning ranges, as they are restricted to the projected image plane, leading to misjudgment in three-dimensional space.
Innovation Solution
A method and system that utilize a processor to detect objects, extract key points, convert pixel coordinates to world coordinates using a transformation matrix, and issue warnings based on these coordinates to accurately determine intrusion in a control zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single camera is used to monitor a control zone, then the device complexity is reduced, but the measurement precision of intrusion detection deteriorates due to limited judgment on the projected image plane
Solution Approach 1:
The patent converts two-dimensional image plane coordinates into three-dimensional world coordinates by introducing depth information from a depth map. This dimensionality transformation allows the system to accurately judge whether objects are truly within the control zone in 3D space, rather than merely overlapping on the 2D image plane, thereby resolving the precision issue while maintaining single-camera simplicity
2Measurement precision
If coordinate conversion from image coordinate system to world coordinate system is implemented, then the measurement precision of intrusion detection is improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent introduces a depth map as an intermediary data structure that stores depth information for each pixel. This depth map serves as a mediator between the simple image capture and the complex coordinate transformation, enabling accurate 3D position calculation through matrix operations without requiring complex hardware modifications
3Measurement precision
If depth map processing and coordinate transformation are added, then the measurement precision is improved, but the loss of time increases due to additional processing steps
Solution Approach 1:
The patent performs preliminary actions by pre-calculating and storing the transformation matrix and depth map before actual intrusion detection. By preparing these data structures in advance, the system reduces the computational burden during real-time detection, thereby minimizing processing time delays while maintaining high precision
Data Source
AI summary
A warning method and a warning system are provided. The warning method includes: detecting a specified object in an image; extracting a plurality of key points on the specified object; converting a plurality of first pixel coordinates of the key points of an image coordinate system into a plurality of first world coordinates of a world coordinate system based on a transformation matrix; converting a plurality of second pixel coordinates of a control zone of the image of the image coordinate system into a plurality of second world coordinates of the world coordinate system based on the transformation matrix; and issuing a warning message in response to at least one of the first world coordinates falling into a range formed by the second world coordinates.