Imaging Apparatus Tilt Control for Multi-Subject Focus
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Solution Overview
Problem
Conventional imaging apparatuses face challenges in performing simultaneous and high-speed tilt control and auto focusing, especially when subjects at different distances or heights are present, leading to difficulties in maintaining focus in real-time as subjects change positions.
Innovation Solution
An imaging apparatus with a tilt control unit, a focus lens driving unit, and a control unit that selects from multiple control modes based on the number of subject areas on the image screen, allowing for simultaneous focus correction using both tilt control and focus lens driving to optimize focus and tilt adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tilt control and auto focusing are performed sequentially as in conventional technology, then focus correction can be achieved, but the total time required increases significantly making real-time tracking difficult
Solution Approach 1:
The control unit performs preliminary calculation of both the tilt angle and focus lens driving amount based on subject position information before actual control execution. This allows the system to prepare optimal control parameters in advance, enabling simultaneous execution of tilt and focus adjustments without sequential delays.
Solution Approach 2:
The patent merges tilt control and focus lens driving into a single simultaneous control process. The control unit calculates both parameters together and executes them concurrently, combining two previously separate operations into one unified action that reduces total processing time while maintaining accuracy.
2Device complexity
If a single tilt angle is used for both short-distance and long-distance subjects, then the control system remains simple, but multiple subjects at different distances cannot be focused simultaneously
Solution Approach 1:
The system dynamically adjusts the tilt angle based on the positions of multiple subjects. Rather than using a fixed tilt angle, the control unit calculates optimal tilt angles for different subject distances and selectively applies them, enabling the system to adapt to varying subject configurations while maintaining manageable complexity through algorithmic control.
Solution Approach 2:
The patent applies different tilt angles to different regions or subjects within the imaging area. By determining subject-specific tilt angles based on their positions (short-distance vs. long-distance subjects), the system provides locally optimized focus control for each subject while maintaining overall system simplicity through centralized control logic.
3Shape
If tilt control is performed at a predetermined angle, then the optical axis is properly oriented, but the focused plane does not coincide with the imaging plane of subjects at various distances
Solution Approach 1:
The system changes the tilt angle parameter dynamically based on subject position information. Instead of maintaining a predetermined fixed tilt angle, the control unit adjusts the tilt angle parameter according to the distances and positions of subjects, thereby aligning the focused plane with the imaging plane of subjects at various distances while preserving proper optical axis orientation.
Data Source
AI summary
In order to provide a tilt control device capable of performing tilt control optimal at a high speed by controlling both a focus position and a tilt angle even when a scene changes such as in a case in which a subject changes, there is provided an imaging apparatus including a tilt control unit that performs tilt control by driving at least one of an imaging device and an imaging optical system, a focus lens driving unit that drives a focus lens, and a control unit that has a plurality of control modes for performing focus correction using at least one of the tilt control unit and the focus lens driving unit and selects one of the plurality of control modes in accordance with the number of subject areas displayed on an image screen.