Focusing Apparatus Epipolar Geometry Resolution Switching
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Solution Overview
Problem
Existing picture taking devices experience suspension of automatic focus function when resolution changes, leading to increased user interaction and unsatisfactory image or video output.
Innovation Solution
A method and apparatus that determine the switching of imaging modes, estimate the position of the target object based on resolution and field of view changes, and search for the object using an epipolar geometry principle to maintain continuous automatic focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resolution switching function is implemented in picture taking devices, then adaptability to different picture taking modes is improved, but automatic focus function suspends and user interaction increases
Solution Approach 1:
The patent applies preliminary action by estimating the new target position in advance before resolution switching occurs. The system calculates the expected position of the target object in the new resolution mode using the epipolar constraint equation, then uses this pre-calculated position as the starting point for focus search, preventing automatic focus suspension during resolution transitions.
Solution Approach 2:
The patent introduces an intermediary computational mechanism - the epipolar constraint equation - that bridges the old target position and the new target position across different resolution modes. This mathematical model serves as a mediator to translate position information between different imaging modes, enabling continuous automatic focus without manual intervention.
2Adaptability or versatility
If resolution changes in imaging mode, then picture taking mode versatility is improved, but target object position shifts and focusing accuracy deteriorates
Solution Approach 1:
The patent applies dimensionality change by transforming the position estimation problem from a simple coordinate transformation into a geometric constraint problem using epipolar geometry. By introducing the epipolar line concept and using the constraint equation y1*x2 - x1*y2 + x1*c2 - x2*c1 + c1*y2 - c2*y1 = 0, the system accurately determines target position in the new resolution dimension while maintaining precision.
3Productivity
If automatic focus continues during resolution switching, then productivity is improved, but calculation complexity and device complexity increase
Solution Approach 1:
The patent replaces complex mechanical or empirical focus adjustment mechanisms with a mathematical computation system based on epipolar geometry. Instead of using complex hardware interventions or trial-and-error focus searching during resolution switching, the system uses the epipolar constraint equation to directly calculate the new target position, simplifying the overall system while maintaining continuous automatic focusing capability.
Data Source
AI summary
A method and an apparatus for focusing are disclosed. The method includes: determining a switch of imaging mode from a first imaging mode to a second imaging mode, wherein a position of an image of a target object in the first imaging mode is different from a position of an image of the target object in the second imaging mode; estimating the position of the image of the target object in the second imaging mode according to a resolution in the first imaging mode, a resolution in the second imaging mode, a field of view in the first imaging mode, a field of view in the second imaging mode and the position of the image of the target object in the first imaging mode; and searching for the image of the target object in the second imaging mode according to the estimated position.