Camera Shake Correction Lens Control via Internal Acceleration Subtraction
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Solution Overview
Problem
Existing image pickup apparatuses face challenges in accurately correcting camera shake during operations like zooming, focusing, or aperture control, as mechanical movable sections introduce noise in angular and acceleration sensors, leading to degraded image quality and difficulty in framing determination, especially in macro image capturing and moving-image capturing.
Innovation Solution
An image pickup apparatus equipped with an angular velocity detector, acceleration detector, translational acceleration calculator, and a driver that calculates and corrects camera shake by distinguishing between internal and external accelerations using high-pass filters and specific driving patterns, allowing continuous camera shake correction even during lens unit operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the camera shake correction mechanism is suspended during lens unit operation, then the measurement precision of sensors is improved, but the productivity and ease of operation are worsened
Solution Approach 1:
The patent converts the harmful internal acceleration generated by lens unit operation into a beneficial signal by using it as a reference to subtract from the sensor output. The acceleration sensor detects both external camera shake acceleration and internal acceleration from lens movement. By identifying the internal acceleration pattern (through position detection of lens units or predetermined patterns) and subtracting it from the total detected acceleration, the system extracts only the external camera shake component, thereby maintaining sensor measurement precision while allowing continuous camera shake correction during lens operation.
2Productivity
If the camera shake correction mechanism operates during lens unit operation, then the productivity is improved, but the measurement precision deteriorates due to noise from internal acceleration
Solution Approach 1:
The patent extracts the external camera shake acceleration signal from the composite signal detected by the acceleration sensor. The acceleration sensor detects a composite signal containing both external camera shake acceleration and internal acceleration from lens unit operation. By taking out (extracting) the internal acceleration component through position detection of lens units or predetermined patterns and subtracting it from the total signal, the system isolates only the external camera shake component, thereby maintaining measurement precision while enabling continuous camera shake correction.
3Adaptability or versatility
If mechanical movable sections operate during image capturing, then the adaptability is improved, but the measurement precision worsens due to noise in angular velocity sensor and acceleration sensor
Solution Approach 1:
The patent introduces position detection means for lens units as an intermediary element that bridges the lens unit operation and the acceleration sensor output. The position detection means detects the position of movable lens units during operation, and this position information serves as an intermediary signal that is converted into internal acceleration patterns. These intermediary internal acceleration patterns are then subtracted from the acceleration sensor output to eliminate noise, thereby maintaining measurement precision while allowing flexible lens unit operation during image capturing.
4Measurement precision
If the camera shake correction mechanism is suspended during zooming or focusing, then the measurement precision is improved, but the ease of operation and image quality deteriorate
Solution Approach 1:
The patent converts the harmful internal acceleration generated during zooming or focusing operations into a beneficial reference signal. The acceleration sensor detects composite acceleration including both external camera shake and internal acceleration from lens movement. By identifying the internal acceleration pattern (through position detection or predetermined patterns specific to zooming/focusing) and subtracting it from the total detected acceleration, the system extracts only the external camera shake component, thereby maintaining sensor measurement precision while allowing continuous camera shake correction during zooming or focusing, which improves framing determination ease and image quality.
Data Source
AI summary
At the time of occurrence of camera shake, an angular velocity sensor detects an angular velocity. A rotation angle calculator integrates the angular velocity to calculate angle camera shake. A translational acceleration calculator subtracts an internal acceleration caused during operation of a lens unit from a first translational acceleration detected by an acceleration sensor, so as to calculate a second translational acceleration. A translational velocity calculator integrates the second translational acceleration to calculate a translational velocity. A rotation radius calculator calculates a rotation radius based on the angular velocity and the translational velocity. A shake amount calculator calculates a camera shake amount based on the angle camera shake and the rotation radius. An actuator drives a camera shake correction lens in a direction for canceling the camera shake amount.