Adaptive Lens Drift Correction via Image Feature Monitoring
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Solution Overview
Problem
Existing optoelectronic systems with adaptive lenses face challenges in maintaining precise focus due to temperature-dependent drift and aging effects, leading to image blur, as traditional methods are slow and unable to effectively compensate for these changes.
Innovation Solution
An optoelectronic apparatus with a tiltable adaptive lens that monitors the position of an image feature using an image sensor, allowing for drift correction by tilting the lens and adjusting control signals to compensate for temperature and aging effects, enabling quick and precise focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative autofocus methods are used to determine focal position, then focus accuracy is improved, but response time deteriorates
Solution Approach 1:
The system performs preliminary calibration by storing reference image data at known focal positions during manufacturing or initial setup. This pre-stored reference data enables the autofocus algorithm to compare current images against known good focal positions, eliminating the need for slow iterative searching while maintaining accuracy.
Solution Approach 2:
The invention creates a digital copy of the reference image data at known focal positions and stores it in memory. This copied reference data is then used for comparison during autofocus operation, replacing the need for real-time iterative measurement and significantly reducing response time while preserving focus accuracy.
2Loss of time
If open-loop focusing with distance measurement is used, then response time is improved, but focus accuracy deteriorates
Solution Approach 1:
The system incorporates feedback by capturing an image, comparing it against stored reference image data, and adjusting the focal position based on the comparison result. This closed-loop feedback mechanism ensures accurate focus is achieved while maintaining fast response times, as the system only needs to make small adjustments rather than perform iterative searching.
Solution Approach 2:
The invention dynamically adjusts the focal position based on real-time image analysis and comparison with reference data. The system transitions from static distance-based focusing to dynamic image-quality-based focusing, allowing it to adapt to actual optical conditions and achieve accurate focus rapidly.
3Stability of the object's composition
If temperature compensation matrices are applied to liquid lenses, then temperature drift is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by automatically comparing current image data against stored reference data and self-correcting focal position deviations caused by temperature drift or aging. This self-service approach eliminates the need for complex external compensation mechanisms while maintaining stability.
Solution Approach 2:
The invention implements continuous feedback by monitoring image quality and comparing it against reference data, then automatically adjusting focal positions to compensate for temperature drift and aging effects. This feedback-based compensation is simpler than pre-computed temperature matrices as it adapts dynamically without requiring complex lookup tables or calculations.
4Adaptability or versatility
If mechanical focal adjustment with electromechanical lenses is used, then focus range is improved, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The invention replaces complex electromechanical lens adjustment mechanisms with a simpler electronic image processing and comparison system. By using stored reference image data and digital comparison algorithms, the system achieves focal adjustment without mechanical moving parts, reducing device complexity and manufacturing precision requirements while maintaining adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for rapid and accurate focus setting, compensating for temperature and aging-induced drifts, ensuring sharp images even in open-loop methods, and can be verified to maintain correct focus compensation.
Implementation Method 1
Liquid lenses, for example, utilize the so-called electro wetting effect, in that two non-mixable liquids are arranged above one another in a chamber. On application of a control voltage the two liquids change their surface tensions in a different manner such that the inner boundary surfaces of the liquids vary their curvature in dependence on the voltage.
Implementation Method 2
Having regard to a gel lens, a silicon-like liquid is mechanically deformed by means of piezo electric or inductive actuator.
Data Source
AI summary
An optoelectronic apparatus (10) for the detection of object information from a monitored zone (12), comprising an image sensor (16), a receiving optics (14) associated with the image sensor (16), the receiving optics having an adaptive lens (26) with variable tilt and an evaluation unit (18) for the generation of object information from a received signal of the image sensor (16) is provided. In this respect the evaluation unit (18) is adapted to determine a first position of an image feature (24) in a recording of the image sensor (16) on a control of a first tilt angle of the adaptive lens (26) and to determine a drift correction for the adaptive lens (26) from the first position.