Dynamic Shake Correction Signal Processing for Camera Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The performance of image blur correction in camera systems is affected by performance differences between shake detection units in the lens and camera body, leading to potential deterioration in image blur correction due to time delays, high-frequency noise, and phase shifts, especially when there are variations in detection performance between these units.
Innovation Solution
A signal processing device and method that dynamically adjusts the correction ratio and frequency band settings for shake detection signals from both the lens and camera units, using feedback control and correction band restriction to optimize image blur correction by supplementing low-frequency components and correcting high-frequency components, thereby ensuring effective image stabilization across varying detection performance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple shake detection units are used in lens and camera body, then image blur correction coverage is improved, but performance differences between units cause deterioration in correction accuracy
Solution Approach 1:
The patent dynamically adjusts the correction ratio between lens-side and body-side shake correction units based on detected shake frequency and magnitude. The control unit varies the correction ratio in real-time, increasing reliance on the lens unit for high-frequency shake and body unit for low-frequency shake, thereby optimizing correction accuracy while utilizing both units' capabilities
Solution Approach 2:
The patent changes the operational parameters (correction ratio, cutoff frequency) of the shake correction system based on detected shake characteristics. By adjusting these parameters dynamically, the system adapts to different shake conditions and compensates for performance differences between detection units, maintaining high correction accuracy across various scenarios
2Ease of operation
If correction ratio is fixed between multiple shake correction members, then control simplicity is maintained, but correction performance deteriorates when detection units have performance differences
Solution Approach 1:
The system transitions from fixed correction ratio to dynamic correction ratio adjustment based on shake characteristics. The control unit automatically varies the correction ratio according to detected shake frequency and magnitude, maintaining reliability under different conditions without requiring complex manual configuration
Solution Approach 2:
The shake correction system performs self-adjustment by automatically varying the correction ratio based on its own detected shake characteristics. The control unit monitors shake conditions and autonomously optimizes the correction distribution between lens and body units without external intervention, maintaining both simplicity and reliability
3Measurement precision
If standard value calculation is performed for blur detection signals, then correction accuracy is improved, but time delay occurs during calculation process
Solution Approach 1:
The patent performs preliminary calculation of standard values during periods when shake magnitude is small or during stable periods before actual shooting. By pre-calculating and storing standard values, the system reduces calculation time delay during active shooting while maintaining correction accuracy through use of these pre-computed references
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A signal processing device includes an acquisition means (5, 15) configured to acquire a first shake detection signal indicating a detection result of a lens shake detection means (17) included in an interchangeable lens (2) and a second shake detection signal indicating a detection result of a camera shake detection means (12) included in a body unit (1); and a determination means (306) configured to determine a correction amount which is used to correct the first shake detection signal based on the first shake detection signal and the second shake detection signal. The determination means (306) changes a process parameter for determining the correction amount in accordance with information regarding the camera shake detection means (12) or information regarding the second shake detection signal. The process parameter includes at least one of a restriction frequency and a gain for the correction amount.