Imaging Apparatus Shake Correction via Distance-Based Gain Adjustment
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Solution Overview
Problem
High magnification imaging at short object distances is complicated by both rotational and translational shakes, making it difficult to accurately correct image blur using only angular velocity information, and the addition of an acceleration sensor increases system complexity and computing load.
Innovation Solution
An imaging apparatus with a distance detection unit, shake detection unit, and driving unit that moves optical or imaging elements to correct image blur, using a control unit to calculate movement based on detected shakes and adjust correction gains according to object distance, allowing continuous image capture and variation in correction gains to address both rotational and translational shakes without needing an acceleration sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an acceleration sensor is added to detect translational shake, then the accuracy of image blur correction is improved, but the system complexity and computing load increase
Solution Approach 1:
The patent introduces an intermediary computational approach by using the relationship between rotational shake, object distance, and translational shake to indirectly detect translational shake effects. Instead of directly measuring translational shake with an acceleration sensor, the system calculates the equivalent translational shake amount based on rotational shake detection results and object distance information, thereby achieving accurate correction without adding physical sensors
Solution Approach 2:
The patent replaces the mechanical sensing approach (acceleration sensor for direct translational shake detection) with a computational model that uses existing rotational shake data and optical parameters. This substitution eliminates the need for additional mechanical sensors while achieving the same correction objective through mathematical relationships between shake components
2Measurement precision
If an acceleration sensor is added to detect translational shake, then the accuracy of image blur correction is improved, but the computing load increases
Solution Approach 1:
The patent introduces an intermediary computational approach by using the relationship between rotational shake, object distance, and translational shake to indirectly detect translational shake effects. Instead of directly measuring translational shake with an acceleration sensor, the system calculates the equivalent translational shake amount based on rotational shake detection results and object distance information, thereby achieving accurate correction without adding physical sensors
Solution Approach 2:
The patent changes the approach from direct measurement to parameter-based calculation. By utilizing the relationship between object distance, rotational shake angle, and translational shake displacement (where translational displacement ≈ focal length × rotational angle), the system transforms the problem into a computational task using existing parameters rather than requiring new measurement resources
3Measurement precision
If correction gain is adjusted for each imaging operation based on object distance, then the accuracy of image blur correction is improved, but the processing complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of correction gain based on object distance. The correction gain is not fixed but varies according to the detected object distance, allowing the system to adapt to different imaging scenarios. This dynamic approach improves correction accuracy for both near and far objects while maintaining a relatively simple control structure by using a single adjustable parameter
Data Source
AI summary
An imaging apparatus includes: a distance detection unit that detects an object distance; a shake detection unit that detects an amount of shake of the imaging apparatus; a driving unit that moves an optical element or an imaging element included in an imaging optical system to correct an image blur caused by a shake of the imaging apparatus; and a control unit that calculates an amount of movement of the optical element or the imaging element moved by the driving unit based on the amount of shake detected by the shake detection unit and controls the driving unit, and the control unit directs the imaging element to continuously capture images in response to an imaging instruction and changes a correction gain which is used to calculate the amount of movement for each imaging operation, depending on the object distance detected by the distance detection unit.