Image Stabilization Signal Division for Full Stroke Utilization
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Solution Overview
Problem
Existing image stabilization systems in interchangeable-lens cameras face inefficiencies in utilizing the full stroke of both low-frequency and high-frequency shake correction means, leading to reduced shake correction performance.
Innovation Solution
An image capturing system that employs a frequency/amplitude divider to allocate shake correction signals to both the camera body and lens unit, allowing for separate and optimized use of the camera-side and lens-side shake correction drivers based on variable cutoff frequencies and gain settings, ensuring full utilization of the available correction strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shake correction is performed by dividing shake signals into low-frequency and high-frequency components and allocating them to different correction means, then the influence of time delay is reduced and shake correction performance is improved, but the stroke of individual correction means may be insufficient or largely unused depending on shake characteristics
Solution Approach 1:
The patent applies dynamics by making the frequency division point and amplitude ratios variable rather than fixed. The control unit dynamically adjusts the cutoff frequency of the low-pass filter and the amplitude ratios based on real-time shake characteristics detected by the shake detection unit. This allows the system to adapt to different shake conditions (e.g., camera shake versus hand shake) and optimally utilize the stroke of both correction means under varying conditions, resolving the contradiction between achieving reliable shake correction and adapting to different shake types.
Solution Approach 2:
The patent changes key parameters including the cutoff frequency of the low-pass filter and the amplitude ratios for low-frequency and high-frequency components. By varying these parameters according to detected shake characteristics, the system can shift the boundary between low-frequency and high-frequency shake correction allocation. This parameter adjustment enables full utilization of both correction means' strokes while maintaining effective shake correction across different shake scenarios.
2Device complexity
If a fixed frequency division method is used to allocate shake correction signals, then the system structure is simple, but the correction stroke cannot be fully utilized for all types of shake
Solution Approach 1:
Rather than using a fixed frequency division method, the patent implements a dynamic control system that adjusts the frequency division point and amplitude ratios based on real-time shake detection. This dynamic approach maintains relatively simple system structure while significantly improving shake correction performance by adapting to different shake characteristics, thus resolving the contradiction between simplicity and effectiveness.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
An image stabilization apparatus includes a shake detection means configured to detect an image blur, a generation means configured to generate a first shake correction signal and a second shake correction signal based on a shake signal corresponding to a detection result from the shake detection means, the generation means extracting a low-frequency band signal from the shake signal, changing an amplitude of the extracted low-frequency band signal to generate the first shake correction signal, and generating the second shake correction signal based on the change in the amplitude and the shake signal, a first shake correction means configured to correct the image blur based on the first shake correction signal; and a transmission means configured to transmit the second shake correction signal to a second image stabilization apparatus.