Focus Lens Principal Point Shift for Bracketing Precision
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Solution Overview
Problem
In the focus bracketing mode of imaging devices, the risk of imaging failure is high due to subjects such as insects or flowers moving during continuous imaging, as existing technologies do not effectively manage the movement of the focus lens to ensure proper focus across multiple images.
Innovation Solution
An imaging apparatus and method that uses a focus lens capable of changing its principal point position within a range, with an imaging controller that performs multiple imaging operations by setting the focus lens at various positions within a movement range, narrowing the distances between these positions in later operations to reduce the risk of imaging failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of imaging operations is increased to obtain sufficient sense of resolution, then the imaging quality is improved, but the time required for continuous imaging increases, making the main subject highly likely to move during imaging
Solution Approach 1:
The patent applies dynamics by making the focus lens movement distance variable rather than fixed. The imaging controller adjusts the movement distance of the focus lens based on the imaging operation sequence, with later operations using smaller movement distances. This dynamic adjustment allows the system to adapt the imaging parameters in real-time, achieving sufficient resolution while reducing total imaging time to minimize subject movement.
Solution Approach 2:
The patent changes the parameter of focus lens movement distance according to the imaging operation sequence. By making the movement distance variable and reducing it in later imaging operations, the system optimizes the balance between image quality and imaging speed, thereby reducing the risk of subject movement during the imaging process.
2Loss of time
If the number of imaging operations is decreased to shorten continuous imaging time, then the risk of subject movement is reduced, but the sense of resolution of the main subject is insufficient
Solution Approach 1:
The system dynamically adjusts the focus lens movement distance based on the imaging operation sequence. By making the movement distance variable rather than fixed, the system can perform multiple imaging operations efficiently, achieving sufficient resolution while minimizing total imaging time to reduce subject movement risk.
Solution Approach 2:
The patent changes the focus lens movement distance parameter according to the imaging operation sequence, with later operations using smaller movement distances. This parameter adjustment allows the system to maintain adequate resolution quality while reducing the total number of imaging operations needed, thereby shortening continuous imaging time.
3Ease of operation
If the focus lens movement distance is kept constant throughout continuous imaging, then the imaging process is simple to control, but the system cannot adapt to subject movement and imaging failure risk increases
Solution Approach 1:
The patent implements dynamic control by making the focus lens movement distance variable based on the imaging operation sequence. The imaging controller automatically adjusts the movement distance for each operation, allowing the system to adapt to subject movement while maintaining straightforward control through automated parameter adjustment.
Data Source
AI summary
An imaging apparatus includes: an imager that performs imaging of a subject through an imaging optical system including a focus lens capable of changing a position of a principal point in a range between a first position and a second position in a direction of an optical axis; and an imaging controller that continuously performs plural imaging control operations for causing the imager to perform imaging of the subject through the imaging optical system in a state where the principal point of the focus lens is set at each of plural imaging positions which are set in a movement range as at least a partial range of the range, and the imaging controller makes distances between the plural imaging positions narrower and sets a larger number of the plural imaging positions in an imaging control operation performed later in time series among the plural imaging control operations.