PTZ Camera Focusing Algorithm Selection for Region of Interest
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Solution Overview
Problem
Existing camera focusing systems struggle to accurately and quickly focus on a region of interest during pan-tilt-zoom (PTZ) operations, especially in varying environmental conditions.
Innovation Solution
A focusing apparatus and method that determines whether a region of interest is included in a surveillance image, and based on this determination, selects between two focusing algorithms. The first algorithm automatically sets a focus area and moves the focus lens step-by-step, while the second algorithm sets the region of interest as the focus area and moves the focus lens to a preset position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the first focusing algorithm is used (automatic focus area setting with step-by-step lens movement), then the focusing system can adapt to unknown regions, but the focusing speed is slow and time-consuming
Solution Approach 1:
The system performs preliminary actions by pre-storing reference images of regions of interest and pre-calculating corresponding focus lens positions. When a region is detected in the surveillance area, the system can directly retrieve the pre-computed focus position rather than performing step-by-step search, thereby significantly reducing focusing time while maintaining adaptability to different regions of interest.
2Loss of time
If the second focusing algorithm is used (preset focus lens position based on region of interest), then the focusing speed is fast, but the system requires prior knowledge of the region of interest
Solution Approach 1:
The system performs preliminary actions by pre-storing reference images of regions of interest and pre-calculating corresponding focus lens positions. When a region is detected in the surveillance area, the system can directly retrieve the pre-computed focus position rather than performing step-by-step search, thereby significantly reducing focusing time while maintaining adaptability to different regions of interest.
3Device complexity
If traditional focusing systems are used during PTZ operations, then the system structure is simple, but the focusing accuracy deteriorates under varying environmental conditions
Solution Approach 1:
The system employs feedback mechanisms by comparing the detected region of interest in the current surveillance image with pre-stored reference images. Based on this comparison and the known relationship between zoom magnification and focus lens position, the system dynamically adjusts the focus lens to achieve accurate focusing. This feedback-based approach maintains focusing accuracy under varying environmental conditions during PTZ operations without significantly increasing system complexity.
Data Source
AI summary
A focusing method of a camera for obtaining an image of a surveillance area by performing a pan-tilt-zoom (PTZ) operation is included. The focusing method includes: determining whether a region of interest set in the surveillance area is included in a first image obtained by the camera; converting a mode according to a result of the determination by selecting a first mode in which focusing is performed using a first focusing algorithm or a second mode in which focusing is performed using a second focusing algorithm that is different from the first focusing algorithm; and focusing the camera with respect to the first image according to the first mode or the second mode.