Image Stabilization Shake Detection and Correction
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Solution Overview
Problem
Conventional image stabilization methods for image capture apparatuses face challenges in efficiently correcting image blurs caused by camera shakes during walking, leading to degradation in image quality due to complex calculations and the need for extra pixels, which results in a reduced output image range.
Innovation Solution
An image capture apparatus with a dual shake detection system, including a first and second shake detection unit, calculates rotational and translational shake amounts to determine correction amounts for image blurring, focusing on translational motion, rotation, and perspective components, while minimizing the need for extra pixels through saturation prevention control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correction is performed for all deformation components (translation, perspective, rotation, shear) using conventional methods, then image stabilization is achieved, but calculation amount becomes very large and processing becomes complicated
Solution Approach 1:
The patent extracts and corrects only the translational motion component from the full set of deformation components. By separating the correction target from other components (rotation, perspective, shear), the calculation complexity is significantly reduced while maintaining effective image stabilization for the predominant blur type
Solution Approach 2:
The patent segments the shake detection into two independent parts: rotational shake detection and translational shake detection. This segmentation allows each detector to be optimized for its specific function and enables independent correction strategies, simplifying the overall processing pipeline
2Reliability
If correction is performed for all deformation components, then image stabilization is achieved, but output image range becomes small resulting in degradation in image quality
Solution Approach 1:
By extracting and correcting only the translational motion component, the patent minimizes the required extra pixels for correction. This selective approach preserves a larger output image range compared to correcting all deformation components, thereby maintaining higher image quality
Solution Approach 2:
The patent applies partial correction by focusing only on the translational component rather than all deformation components. This partial action is sufficient to achieve the desired stabilization effect while avoiding the quality degradation that would result from comprehensive correction requiring extensive extra pixels
3Device complexity
If a single shake detection unit is used, then device arrangement is simple, but shake detection precision is insufficient for accurate correction
Solution Approach 1:
The patent segments the detection function into two specialized units: one for rotational shake and one for translational shake. This segmentation enables each unit to be optimized for its specific detection task, improving overall measurement precision while keeping the system arrangement manageable through functional specialization
Data Source
AI summary
An image capture apparatus comprises a first shake detection unit configured to detect a shake of the image capture apparatus, a rotational shake calculation unit configured to calculate a rotational shake amount, a second shake detection unit configured to detect the shake of the image capture apparatus, a translational shake calculation unit configured to calculate a translational shake amount, a correction amount calculation unit configured to calculate, based on the rotational shake amount and the translational shake amount, a correction amount for correcting image blurring, and a correction unit configured to correct the image blurring, wherein the rotational shake calculation unit calculates a first translational motion component and perspective component, and wherein the correction amount calculation unit calculates a second translational motion component.