Image Pickup Device Peripheral Light Correction for Shake
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Solution Overview
Problem
Image pickup devices face a decrease in image quality due to reduced peripheral light quantity as the distance from the center of the imaging element increases, especially during shake correction, which affects both still and moving images.
Innovation Solution
An image pickup device with a peripheral light quantity correction unit that adjusts the correction amount based on detected shake frequency components, using a combination of optical image stabilizer (OIS) and body image stabilizer (BIS) functions to shift lenses and imaging elements, thereby maintaining image quality by optimizing light distribution across the imaging element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the correction lens or imaging element is shifted to reduce shake influence, then shake correction is improved, but peripheral light quantity decreases
Solution Approach 1:
The patent applies dynamics by making the peripheral light quantity correction amount variable based on shake frequency. The correction amount is dynamically adjusted according to the detected shake frequency, being larger for low-frequency shake and smaller for high-frequency shake. This dynamic adjustment resolves the contradiction by adapting the correction to the actual shake conditions rather than applying a fixed correction that would always reduce peripheral light quantity.
Solution Approach 2:
The patent changes the parameter of correction amount based on the frequency parameter of shake. By extracting the frequency component from shake detection and using it to modulate the peripheral light quantity correction, the system optimizes the balance between shake correction effectiveness and peripheral light quantity maintenance. This parameter-based adjustment allows the system to achieve better shake correction while minimizing peripheral light loss.
2Illumination intensity
If a fixed peripheral light quantity correction is applied, then peripheral light quantity is improved, but image quality during moving image capture deteriorates
Solution Approach 1:
The patent resolves this contradiction by making the peripheral light quantity correction dynamic rather than fixed. The correction amount varies according to the detected shake frequency, allowing the system to maintain optimal peripheral light quantity for each specific shake condition during moving image capture. This dynamic approach prevents the degradation of moving image quality that would result from a fixed correction applied to all conditions.
Solution Approach 2:
The system uses feedback from the shake detector to continuously adjust the peripheral light quantity correction. By detecting the actual shake frequency and using it to control the correction amount in real-time, the system ensures that the peripheral light quantity correction is always appropriate for the current capture conditions, thereby maintaining high moving image quality.
Data Source
AI summary
An image pickup device includes an optical system including a plurality of lenses, an imaging element that captures a subject image formed by the optical system, and a peripheral light quantity correction unit that corrects peripheral light quantity of an image captured by the imaging element. The image pickup device also includes a shake detector that detects shake of the image pickup device, and a drive controller that moves at least one of (i) the plurality of lenses and (ii) the imaging element on a plane perpendicular to an optical axis in response to an output signal of the shake detector to correct the shake. The peripheral light quantity correction unit extracts a predetermined frequency component of the shake and changes a correction amount of the peripheral light quantity in response to the predetermined frequency component of the shake.