Camera Displacement Correction Using Focal Length Segmentation
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Solution Overview
Problem
Conventional camera systems with high magnification capabilities face issues with preset position displacement due to insufficient stopping accuracy during pan/tilt operations, and existing correction methods are unable to accurately correct displacements caused by external forces or achieve higher accuracy than the registered position's accuracy.
Innovation Solution
A control device for a camera unit that stores correction images taken at different focal lengths for each preset position, allowing for comparison with newly shot images to correct displacements, enabling accurate and reliable positioning by using telephoto and wide-angle correction images for fine and rough adjustments respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single correction image is stored at the registered preset position, then memory usage is reduced, but the system cannot accurately correct both large displacements (from earthquakes or contact) and small displacements (from insufficient stopping accuracy during zooming)
Solution Approach 1:
The correction images are segmented into multiple groups based on focal length: telephoto end correction images for large displacements and wide-angle end correction images for small displacements. This segmentation allows the system to store fewer images while covering the full range of displacement scenarios, resolving the contradiction between correction reliability and storage complexity.
Solution Approach 2:
The system performs preliminary classification of displacement types and pre-selects appropriate correction images from different focal length groups before actual correction is needed. This preliminary action enables the system to quickly retrieve the most suitable correction image without storing all possible correction images, thereby reducing memory usage while maintaining high correction reliability.
2Measurement precision
If correction images at multiple focal lengths are stored for each preset position, then both large and small displacements can be corrected accurately, but memory usage increases
Solution Approach 1:
Correction images are segmented into telephoto and wide-angle groups based on focal length characteristics. Telephoto correction images handle large displacements with high precision, while wide-angle images handle small displacements. This segmentation achieves high correction accuracy across all displacement types without requiring storage of all possible correction images at all focal lengths.
Solution Approach 2:
The system changes the focal length parameter of correction images based on the magnitude of displacement detected. When large displacement is detected, telephoto correction images are used; when small displacement is detected, wide-angle correction images are used. This dynamic parameter selection achieves high correction accuracy while minimizing memory storage requirements.
3Adaptability or versatility
If only one type of correction image is used, then the system is simpler to operate, but it cannot adapt to different displacement scenarios (large vs. small displacements)
Solution Approach 1:
The control device automatically performs displacement detection, classification, and correction image selection without user intervention. The system self-services by identifying whether displacement is large or small and automatically retrieving the appropriate correction image group, thereby maintaining ease of operation while achieving high adaptability to different displacement scenarios.
Solution Approach 2:
The system performs preliminary classification of displacement magnitude and pre-selects the appropriate correction image group before the actual correction process. This preliminary action enables the system to adapt to different displacement scenarios automatically without complicating the user interface or operation flow, as the user simply needs to trigger the correction function.
Data Source
AI summary
A camera unit which is capable of coping with both a case where it is largely displaced from a preset position and a case where it is slightly displaced from the same, and makes it possible to enhance accuracy and reliability in displacement correction. A zoom/focus control circuit and a pan/tilt control circuit drive the camera unit. A memory stores preset information indicative of a shooting position and a focal length of the camera unit. A correction image memory stores correction images shot at different focal lengths at the shooting position. An image comparison circuit compares between an image shot by the camera unit at the shooting position and the stored correction images, and calculates a displacement amount. A CPU corrects the driving amount of the pan/tilt control circuit based on the calculated displacement amount.