Tilt Angle Control Apparatus for Blur Suppression
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Solution Overview
Problem
Conventional methods for adjusting the tilt angle to achieve a deep depth of field result in blur in short-distance objects, which is not effectively suppressed in existing techniques.
Innovation Solution
A control apparatus that sets evaluation areas for both long-distance and short-distance objects, divides the short-distance object area into partial evaluation areas, and adjusts the tilt angle to maximize the sum of evaluation values across these areas, thereby minimizing blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the tilt angle is adjusted to expand the depth-of-field range, then the depth of field increases, but a blur peculiar to the tilt appears in the short-distance object
Solution Approach 1:
The patent divides the evaluation area into multiple regions: a first evaluation area for long-distance objects and a second evaluation area for short-distance objects. By separately evaluating focus in these segmented regions and combining the results, the system can optimize tilt angle to achieve deep depth of field while suppressing blur in short-distance objects that would otherwise occur with conventional single-area evaluation methods.
2Adaptability or versatility
If a telephoto lens with shallow depth of field is used, then the imaging optical axis plane is orthogonal to the imaging optical axis, but the blur peculiar to the tilt appears before depth-of-field expansion
Solution Approach 1:
The patent implements a feedback mechanism where the system evaluates focus states in both first and second evaluation areas, determines an optimal tilt angle based on combined evaluation results, and adjusts the imaging plane accordingly. This closed-loop feedback allows the system to adaptively suppress blur in short-distance objects while maintaining the ability to use telephoto lenses with shallow depth of field, resolving the contradiction between lens flexibility and blur suppression.
Data Source
AI summary
A control apparatus includes a setting unit that sets an evaluation area in an image, and an angle control unit that adjusts a tilt angle based on an evaluation value in the evaluation area. The setting unit sets a first evaluation area relating to a first object, a second evaluation area relating to a second object closer than the first object, and a first partial evaluation area and a second partial evaluation area both of which are obtained by dividing the second evaluation area. The angle control unit adjusts the tilt angle so as to increase a sum of a first evaluation value in the first evaluation area and a second evaluation value in the second evaluation area, and sets the tilt angle based on a third evaluation value in the first partial evaluation area and a fourth evaluation value in the second partial evaluation area.