Image Stabilization Circuit High Pass Filter Latch
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Solution Overview
Problem
Image stabilization circuits in image capturing devices face challenges in maintaining effective shake correction during still image capture, leading to potential lens movement issues and image quality degradation due to the centering process being stopped or reduced during image capture.
Innovation Solution
A centering processor circuit with a high-pass filter and latch unit that allows frequency components greater than or equal to a predetermined frequency to pass, and a calculating unit that outputs the difference between the input signal and the latch output, with the latch value stepwise changed when released, to control lens movement and prevent excessive vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the centering process is stopped or reduced during image capture, then image quality is improved by preventing lens movement, but shake correction effectiveness deteriorates
Solution Approach 1:
The high-pass filter dynamically adjusts its characteristics based on the operating mode (video capture vs. still image capture). During video capture, the filter maintains normal operation to provide continuous centering and shake correction. During still image capture, the filter characteristics change to allow the latch to hold the center position, preventing excessive lens movement while maintaining adequate shake correction through the stepwise adjustment mechanism.
Solution Approach 2:
The system changes the frequency response parameters of the high-pass filter based on the capture mode. By adjusting the cutoff frequency and filter coefficients, the system enables the latch to effectively hold the center position during still image capture while maintaining dynamic response during video capture, thus resolving the contradiction between lens stability and shake correction effectiveness.
2Speed
If the latch value is rapidly adjusted when released, then the centering response speed is improved, but image quality deteriorates due to skipping and noise
Solution Approach 1:
The system implements periodic or controlled incremental adjustment of the latch value rather than instantaneous change. The stepwise adjustment mechanism divides the correction into multiple small steps, each occurring at controlled intervals, which prevents sudden lens movements that cause skipping and noise while still achieving the centering goal.
Solution Approach 2:
The high-pass filter provides beforehand cushioning by smoothing the transition when the latch value is adjusted. The filter characteristics are designed to attenuate high-frequency components that would cause sudden movements, thereby cushioning the impact of latch value changes and preventing image skipping and noise.
3Speed
If the high-pass filter allows frequent signal variations, then shake correction responsiveness is improved, but lens stability deteriorates causing excessive movement
Solution Approach 1:
The high-pass filter dynamically adapts its characteristics based on the operational context. During video capture, the filter maintains high responsiveness to detect and correct shake movements quickly. During still image capture, the filter characteristics change to prioritize stability, allowing the latch to hold the center position and preventing excessive lens movement while maintaining adequate shake correction through stepwise adjustment.
Solution Approach 2:
The system changes the filter parameters (cutoff frequency, coefficients) based on the capture mode to balance responsiveness and stability. By adjusting these parameters, the system enables the latch to effectively hold the center position during still image capture while maintaining dynamic response during video capture, thus resolving the contradiction between responsiveness and stability.
Data Source
AI summary
A first high-pass filter comprising a low-pass filter which allows only a frequency component of an input signal less than or equal to a first frequency to pass, a latch unit which latches an output of a low-pass filter according to a control signal, and a calculating unit which outputs a difference between an input signal and an output of the latch unit are provided on an image stabilization circuit. When latching in the latch unit is released, a held value of the latch unit is stepwise changed to the output value of the low-pass filter. Such a first high-pass filter is used in a centering process of an optical element.