PTZ Camera Selection Using Viewability and Angular Speed
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Solution Overview
Problem
Conventional video monitoring systems fail to automatically select a PTZ camera capable of effectively tracking a mobile object from multiple PTZ cameras, as they do not account for the camera's ability to maintain sight of the object due to factors like angular speed, occlusion, and image direction.
Innovation Solution
A video monitoring device and method that evaluates the viewability level of a mobile object based on factors such as angular speed, occlusion, and image direction of multiple PTZ cameras, automatically selecting the most suitable camera for capturing and displaying the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional video monitoring systems are used, then the system structure is simple, but the system cannot automatically select a PTZ camera capable of effectively tracking mobile objects
Solution Approach 1:
The system performs preliminary evaluation of multiple PTZ cameras by calculating viewability levels based on angular speed, occlusion probability, and image direction before actual mobile object tracking begins. This pre-assessment enables automatic selection of the most suitable camera without requiring complex real-time decision-making during object tracking.
Solution Approach 2:
The system continuously monitors the actual tracking performance of selected cameras and uses this feedback to refine future selections. The viewability level evaluation incorporates feedback loops that compare predicted performance with actual tracking results, enabling progressively improved automatic camera selection.
2Speed
If PTZ cameras with high angular speed are used, then the camera can quickly track mobile objects, but the camera cannot maintain stable and clear viewing due to excessive movement
Solution Approach 1:
The system dynamically adjusts the angular speed parameter of PTZ cameras based on the specific tracking scenario and mobile object characteristics. By optimizing angular speed as a variable parameter rather than using fixed high speed, the system achieves both quick response to object movement and stable continuous tracking through adaptive speed modulation.
3Area of stationary object
If multiple PTZ cameras are deployed, then the coverage area is expanded, but the system cannot determine which camera is most suitable for tracking mobile objects
Solution Approach 1:
The system divides the monitoring area into multiple zones covered by different PTZ cameras and evaluates each camera's suitability for tracking mobile objects within its specific coverage segment. By segmenting the assessment process into camera-specific viewability level calculations, the system can objectively compare multiple cameras and select the most appropriate one for each tracking scenario.
4Adaptability or versatility
If the system frequently switches between different PTZ cameras, then the system can adapt to mobile object movement, but the observer experiences frequent video switching and reduced visibility
Solution Approach 1:
The system performs preliminary selection of the optimal PTZ camera based on predicted mobile object trajectory and current viewing conditions before actual tracking begins. This pre-determined camera selection minimizes unnecessary switches during tracking, ensuring viewing continuity while maintaining adaptability through intelligent initial camera choice.
Data Source
AI summary
A video monitoring device includes processing circuitry to acquire position information indicating a position of a mobile object; to command image capturing directions of a plurality of movable cameras provided at predetermined positions; to evaluate a viewability level of the mobile object in a video captured by each of the plurality of movable cameras based on the position of the mobile object and the positions of the plurality of movable cameras; to select a movable camera for use for image capturing of the mobile object from the plurality of movable cameras based on the viewability level; and to display the video of the mobile object captured by the selected movable camera, wherein the viewability level is evaluated based on an angular speed of swiveling of each of the plurality of movable cameras necessary for each of the plurality of movable cameras to keep sight of the mobile object.