Shake Compensation Control Using Dynamic Focus Coefficients
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Solution Overview
Problem
Existing camera shake compensation technologies face challenges in accurately detecting and compensating for translational shake, especially during close-range macro-imaging and high focal length conditions, due to environmental fluctuations and noise affecting acceleration meter outputs, leading to reduced shake compensation control performance and potential image deterioration.
Innovation Solution
A shake compensation apparatus that includes a detection unit for translational shake, a compensation amount calculation unit that adjusts the compensation coefficient based on zoom and focus lens positions and focus degree, and a drive unit to accurately drive the shake compensation lens, reducing compensation errors caused by rapid imaging magnification changes during autofocus operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If translational shake is detected using acceleration meter with double integration, then translational shake compensation is achieved, but measurement precision deteriorates due to environmental fluctuations and noise
Solution Approach 1:
The patent introduces a rotation center calculation unit that computes a virtual rotation center position based on acceleration meter outputs. This intermediary calculation transforms the raw acceleration data into a meaningful rotation center position, which then serves as a reference for determining actual shake amounts. This mediator approach allows the system to overcome the imprecision of direct acceleration measurement by converting it into a more stable rotational parameter.
Solution Approach 2:
The patent replaces the mechanical double-integration process with a computational approach using rotation center calculation. Instead of mechanically integrating acceleration data twice (which amplifies noise), the system calculates a virtual rotation center position and uses this to determine shake amounts through geometric relationships, thereby substituting a noisy mechanical process with a more precise computational method.
2Productivity
If shake compensation control is performed during autofocus operations, then continuous focusing is enabled, but shake compensation performance deteriorates due to rapid imaging magnification changes
Solution Approach 1:
The patent implements dynamic adjustment of shake compensation control based on the autofocus state. The control unit varies the degree of shake compensation performed during autofocus operations versus normal imaging operations. During autofocus, the system performs shake compensation at a reduced intensity or with modified parameters, adapting the compensation behavior dynamically to the current operational mode, thereby maintaining both continuous focusing capability and acceptable shake compensation performance.
Solution Approach 2:
The patent changes the shake compensation parameters (such as compensation amount, response speed, or control gain) based on the imaging magnification and autofocus state. When rapid magnification changes occur during autofocus, the system adjusts compensation parameters to prevent excessive control that would reach control limits, thereby maintaining reliable shake compensation throughout the autofocus process.
3Measurement precision
If compensation coefficient is increased for high imaging magnification, then shake compensation accuracy improves, but device complexity increases due to need for multiple detection units
Solution Approach 1:
The patent makes the acceleration meter serve multiple functions: it detects both translational shake components and provides data for calculating the virtual rotation center position. The same detection unit is utilized for both purposes through computational processing, eliminating the need for separate detection units for rotational and translational shake measurement. This multi-functional approach maintains high measurement precision while avoiding increased device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces deterioration in shake compensation control performance and achieves high accuracy image shake compensation for translational shake, even under varying imaging conditions, by dynamically adjusting compensation coefficients based on focus and zoom information.
Implementation Method 1
a shake compensation control apparatus configured to detect rotational shake using a rotational velocity meter
Implementation Method 2
calculate translational shake by application of double integration to the acceleration detected by an acceleration meter
Data Source
AI summary
The image capturing apparatus detects a rotational shake and translational shake produced by an apparatus by a rotational velocity meter and an acceleration meter. A rotational shake compensation coefficient calculation unit calculates a compensation (correction) coefficient in relation to rotational shake. A translational shake compensation coefficient calculation unit calculates a compensation (correction) coefficient in relation to translational shake. When calculating the compensation amount in relation to rotational shake and translational shake using the respective compensation (correction) coefficients, the camera CPU acquires information indicating a degree of focus of the imaging optical system, and suppresses variation in the compensation amount by reducing the compensation (correction) coefficient when the degree of focus is low. A driving unit drives the shake compensation unit in accordance with the compensation amount relative to the rotational shake and the translational shake, thereby compensating for image shake in the imaging surface of the imaging optical system.