Imaging Apparatus Aperture Control for Edge Light Falloff
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Solution Overview
Problem
Image stabilization in imaging apparatuses leads to light falloff at edges, degrading image quality due to the movement of lenses or image sensors, which existing technologies have not adequately addressed.
Innovation Solution
An imaging apparatus with a controller that adjusts the aperture value based on drive limit range information to minimize light attenuation during image stabilization, ensuring the movement of lenses or image sensors occurs within a range that maintains a predetermined light intensity ratio, thereby reducing image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If image stabilization is performed by moving the imaging device or correction lens, then camera shake is corrected and image stability is improved, but light falloff at edges occurs and image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the aperture value based on the drive amount of the imaging device or correction lens. When the drive amount exceeds a predetermined threshold, the aperture is adjusted to a value within a specific range that reduces light falloff at image edges. This changes the optical parameters of the system to balance image stabilization effectiveness with edge brightness uniformity.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the drive amount of the imaging device or correction lens during image stabilization and using this information to adjust the aperture value. The controller receives feedback on the stabilization drive amount and automatically adjusts the aperture to maintain optimal image quality across the entire image area, particularly at the edges where light falloff occurs.
2Illumination intensity
If the aperture value is adjusted to reduce light falloff, then edge brightness is improved, but the amount of light entering the imaging device changes
Solution Approach 1:
The patent carefully selects aperture value ranges that specifically address edge brightness without excessively reducing overall light intake. By defining specific aperture value ranges correlated with drive limit ranges, the system achieves the optimal balance between improving edge illumination and maintaining sufficient total light quantity for proper image exposure.
Data Source
AI summary
An imaging apparatus includes: a shake detector that detects a shake amount of at least one of an interchangeable lens and a camera body; an image stabilization unit that performs an image stabilization by moving at least one of a correction lens and an imaging device by an image stabilization amount obtained based on the shake amount; a storage unit that stores drive limit range information that indicates a relationship between an aperture value and a drive limit range corresponding to the interchangeable lens; and a controller. The drive limit range includes a range where the at least one of the correction lens and the imaging device is to be moved by the controller, and in the drive limit range, a light attenuation rate is less than or equal to a predetermined value. The controller sets the aperture value based on the drive limit range information and causes the image stabilization unit to perform the image stabilization, when a shooting mode is not a first mode that allows designation of the aperture value.