Offset Calculator for Angular Velocity Sensor Image Stabilization
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Solution Overview
Problem
Existing image shake correction systems face accuracy issues due to offset errors in angular velocity sensors, particularly during panning operations, leading to inadequate correction of image shake in both object and background images.
Innovation Solution
An image shake correction apparatus that calculates and subtracts offset values from detection signals to accurately determine angular velocity, allowing for precise control of the image shake correction unit, thereby improving the accuracy of image stabilization during panning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time offset updating is performed using angular velocity sensor data, then offset compensation is achieved, but accuracy deteriorates when offsets change between before-exposure and during-exposure measurements
Solution Approach 1:
The patent performs offset measurement before exposure (pre-exposure offset measurement) to obtain the offset value that will be present during the actual imaging process. This preliminary measurement ensures that the offset compensation is based on the actual sensor state during exposure, rather than relying on potentially changed offset values from previous measurements or real-time updates that may not reflect the true offset during exposure.
2Speed
If angular velocity sensor output is used directly for image shake correction, then correction response is fast, but offset errors cause inaccurate correction
Solution Approach 1:
The patent performs offset measurement before exposure to obtain the offset value that will be present during the actual imaging process. This preliminary measurement ensures that the offset compensation is based on the actual sensor state during exposure, rather than relying on potentially changed offset values from previous measurements or real-time updates that may not reflect the true offset during exposure.
Solution Approach 2:
The patent extracts and removes the offset component from the angular velocity detection signal by performing offset measurement separately before exposure. By isolating and subtracting the offset value from the raw sensor output, the system obtains a clean angular velocity signal free from sensor biases, enabling accurate image shake correction without carrying forward offset errors.
3Measurement precision
If integration is performed for calculating shake correction value from angular velocity data, then shake correction accuracy is improved, but low-frequency noise and offset accumulation prevent complete integration
Solution Approach 1:
The patent extracts and removes the offset component from the angular velocity detection signal by performing offset measurement separately before exposure. By isolating and subtracting the offset value from the raw sensor output, the system obtains a clean angular velocity signal free from sensor biases, enabling accurate image shake correction without carrying forward offset errors.
Solution Approach 2:
The patent applies preliminary offset compensation by measuring and subtracting the offset value before the integration process. This preliminary anti-action prevents offset accumulation during integration, allowing complete integration of angular velocity data without the harmful effects of low-frequency noise and offset drift that would otherwise limit integration accuracy.
Data Source
AI summary
According to an aspect of the invention, an offset calculator calculates a first offset value from an angular velocity detection signal which is detected by an angular velocity sensor and determines a panning offset value as a second offset value. A camera shake correction controller controls driving of a shift lens group and performs camera shake correction on the basis of a signal obtained by subtracting the first offset value. A panning controller acquires angular velocity data of an object with respect to an imaging apparatus which is calculated on the basis of the signal obtained by subtracting the panning offset value.