PTZ Camera Zooming Factor Computation for Constant Object Size
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Solution Overview
Problem
Surveillance systems face challenges in maintaining a consistent object size within a camera's viewing area as the object moves and changes distance, requiring efficient adjustment of zoom and tilt angles to ensure effective tracking.
Innovation Solution
A method and system that utilize a master and slave camera configuration, where the master camera provides a fixed tilt angle and reference zooming factor, while the slave camera adjusts its tilt and zoom based on the object's distance and size, ensuring the object remains at a constant size within its viewing area, using processor-controlled pan, tilt, and zoom (PTZ) adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera adjusts zoom and tilt angles to track a moving object, then the object remains within the viewing area, but the processing power required increases
Solution Approach 1:
The system performs preliminary actions by capturing a first image at an initial tilt angle and calculating a first zooming value before the object moves significantly. This pre-computation establishes a baseline that simplifies subsequent tracking calculations, reducing the processing power needed for real-time adjustments while maintaining reliable tracking accuracy.
Solution Approach 2:
The system dynamically adjusts the zooming factor based on changes in tilt angle. By calculating the second zooming value using the difference between first and second tilt angles, the system adapts the zoom level in real-time as the camera tilts to follow the moving object, ensuring the object remains at a consistent size in the viewing area without requiring excessive processing power.
2Device complexity
If the camera maintains a fixed tilt angle, then the system complexity is reduced, but the ability to track moving objects at varying distances deteriorates
Solution Approach 1:
The system changes the tilt angle parameter dynamically to track moving objects. By allowing the tilt angle to vary while maintaining a straightforward zoom calculation based on tilt angle change, the system achieves effective tracking without introducing complex multi-parameter adjustments, thus balancing simplicity with tracking capability.
3Measurement precision
If the zooming factor is adjusted frequently to maintain object size, then tracking accuracy improves, but the loss of time for computation increases
Solution Approach 1:
The system performs preliminary image capture and zoom value calculation at an initial tilt angle before significant object movement occurs. This pre-computation establishes a baseline that simplifies subsequent tracking, reducing the frequency and complexity of recomputations while maintaining accurate object size representation throughout the tracking sequence.
Data Source
AI summary
Systems, methods, and devices are disclosed for determining a zooming factor for a camera in a pan, tilt, and zoom (PTZ) camera tracking system to enable a camera to keep an object at a constant size within the camera's viewing area, despite changes in the object's distance from the camera. This provides a complement to a camera's pan and tilt tracking of the moving object. For example, a PTZ camera tracking system that determines an object to track, utilizes information regarding images of the object of interest are used to determine a zooming factor (or other zooming value) for a camera in the PTZ camera tracking system. This information includes variables such as tilt angles of one or more cameras and a reference zooming factor.