Pan Tilt Camera Motor Position Error Compensation
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Solution Overview
Problem
Conventional surveillance cameras with stepping motors for pan and tilt functions fail to accurately initialize positions due to loss of driving pulse, leading to incorrect positioning and incomplete monitoring of areas.
Innovation Solution
A surveillance camera system with pan and tilt sensors and a control unit that adaptively adjusts motor positions based on selected monitoring modes, including preset, auto-panning, and pattern modes, to detect and reinitialize standard positions, thereby compensating for position errors caused by driving pulse loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pan motor and tilt motor operate with speed variations and direction changes, then the monitoring coverage and adaptability are improved, but driving pulse loss accumulates causing position initialization errors
Solution Approach 1:
The patent implements feedback by detecting standard positions using pan and tilt sensors during motor operation. The control unit continuously monitors whether standard positions are detected and adjusts driving pulse output accordingly, creating a closed-loop system that compensates for pulse loss and maintains position accuracy despite speed variations and direction changes.
Solution Approach 2:
The patent applies preliminary action by proactively detecting standard positions during motor operation and reinitializing the driving pulse counter before significant position errors accumulate. This preventive approach ensures position accuracy is maintained by addressing potential pulse loss issues before they affect monitoring precision.
2Device complexity
If the driving pulse counter is initialized only at power-on, then the system complexity is reduced, but position errors accumulate over time leading to incomplete monitoring
Solution Approach 1:
The system uses feedback from pan and tilt sensors to detect standard positions during operation. When a standard position is detected, the control unit reinitializes the driving pulse counter, creating an adaptive initialization mechanism that maintains monitoring reliability without requiring complex external intervention or manual reinitialization.
Solution Approach 2:
The system performs self-service by automatically detecting standard positions through integrated sensors and reinitializing its own driving pulse counter without external intervention. This self-correcting mechanism ensures monitoring completeness while keeping the control logic relatively simple and integrated within the existing system architecture.
3Productivity
If the pan motor and tilt motor are driven at varying speeds, then the response time and productivity are improved, but the loss of driving pulse increases causing position drift
Solution Approach 1:
The patent implements feedback by continuously monitoring standard position detection during high-speed motor operation. When speed variations cause potential pulse loss, the sensor detection provides feedback that triggers reinitialization of the driving pulse counter, compensating for pulse loss and maintaining position accuracy despite varying speeds and improved response time.
Data Source
AI summary
A surveillance camera capable of adjusting a position thereof, and a controlling method thereof are disclosed. The surveillance camera capable of adjusting a position to photograph or capture video images of a monitored area by adaptively driving a camera part in accordance with a predetermined monitoring mode selected by an external controller, includes a pan sensor detecting a standard position of a pan motor that transversely rotates the camera part; a tilt sensor detecting a standard position of a tilt motor that perpendicularly rotates the camera part; and a control part outputting a driving control signal for driving the pan motor and/or the tilt motor, adaptively, according to the received monitoring mode selecting signal, such that standard positions of the pan motor and/or the tilt motor are detected respectively by the pan sensor and/or the tilt sensor by a certain period set according to the monitoring mode. Accordingly, positions of the pan motor and the tilt motor are adaptively initialized during the operation thereof, and therefore, position error caused by loss of driving pulse can be compensated, thereby enabling more correct monitoring work.