Auto-focus System Using Multiple Lenses for Speed and Precision
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Solution Overview
Problem
Current auto-focus systems face challenges in achieving high focus speed and accuracy, particularly when dealing with repeated patterns, as three-dimensional focusing is prone to failure and two-dimensional focusing is time-consuming.
Innovation Solution
An auto-focus system utilizing multiple lenses with a contrast value calculation module and focus control module that adjusts lens positions based on calculated contrast values, switching between depth-based and contrast-based focusing approaches depending on the presence of repeated patterns to ensure precision and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If three-dimensional focusing is used to calculate depth from two images, then focus speed is improved, but focusing accuracy deteriorates when repeated patterns appear in the image
Solution Approach 1:
The patent introduces an intermediary mechanism (repeated pattern detection module) that detects whether repeated patterns exist in the image before depth calculation. When repeated patterns are detected, the system switches to contrast value-based focusing instead of depth-based focusing, thereby avoiding inaccurate depth calculations while maintaining fast focusing performance in normal conditions
Solution Approach 2:
The patent implements a dynamic focusing approach that adapts the focusing method based on image content characteristics. The system dynamically switches between two-dimensional contrast-based focusing and three-dimensional depth-based focusing depending on whether repeated patterns are present, optimizing both speed and accuracy for different scenarios
2Measurement precision
If two-dimensional focusing is used to move the lens element multiple times to obtain contrast values, then focusing accuracy is improved, but focus time increases
Solution Approach 1:
The patent applies partial action by performing only the necessary number of lens movements required to achieve adequate focusing accuracy. Instead of always performing multiple contrast value measurements, the system uses fast depth calculation first and only performs additional contrast-based measurements when repeated patterns are detected, reducing unnecessary time consumption while maintaining accuracy when needed
Data Source
AI summary
The present disclosure illustrates an auto-focus system using multiple lenses and method thereof, the system is characterized in using multiple lenses and combining multiple focus approaches to improve focus speed and precision. In particular, the system moves multiple lenses simultaneously to perform focusing for reducing focus time efficiently.