Motion-Adaptive OIS Control for Camera Module Jitter Reduction
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Solution Overview
Problem
Existing electronic devices face limitations in optical image stabilization (OIS) due to a restricted correction angle, which fails to address large motions and can result in micro-shaking and jitter during video recording.
Innovation Solution
The electronic device adaptsively adjusts the suppression ratio of the OIS module based on motion data, extending the correction angle range and employing video digital image stabilization (VDIS) to improve stabilization during varying exposure times and motion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the correction angle range of the OIS module is extended to cover large motions, then the stabilization coverage is improved, but micro-shaking and jitter occur due to rapid suppression ratio adjustments
Solution Approach 1:
The patent applies dynamics by making the suppression ratio adjustable and adaptive rather than fixed. The OIS module dynamically changes its suppression characteristics based on the magnitude of device motion detected, allowing it to handle both small and large motions effectively without causing micro-shaking
Solution Approach 2:
The patent changes the suppression ratio parameter based on motion magnitude. When large motion is detected, the suppression ratio is adjusted to allow broader correction; when small motion is detected, the suppression ratio is reduced to prevent micro-shaking, thus resolving the contradiction between coverage and stability
2Speed
If the suppression ratio is rapidly adjusted to address jitter, then the response speed is improved, but micro-shaking occurs due to over-correction
Solution Approach 1:
The patent implements feedback control by continuously monitoring device motion and adjusting the suppression ratio accordingly. The system uses feedback from motion sensors to dynamically modify OIS behavior, responding to jitter while preventing over-correction that would cause micro-shaking
Solution Approach 2:
The suppression ratio is made dynamic rather than static, allowing the system to adapt its response characteristics in real-time based on actual motion conditions, thus achieving fast response without over-correction
3Device complexity
If the OIS module uses a fixed suppression ratio, then the system complexity is reduced, but it cannot effectively handle varying motion levels and exposure times
Solution Approach 1:
The patent introduces dynamic adjustment of the suppression ratio based on detected motion magnitude and exposure time. This allows a relatively simple base system to achieve adaptive behavior that handles varying motion levels effectively without requiring complex additional hardware
Data Source
AI summary
An electronic device is provided. The electronic device includes a motion sensor configured to output a signal for acquiring motion data corresponding to motion of the electronic device, a camera module including an image sensor and an optical image stabilization (OIS) module which is configured to perform OIS based on the motion of the electronic device, memory storing one or more computer programs, and one or more processors communicatively coupled to the motion sensor, the camera module, and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the electronic device to determine motion state information based on a size of the motion data when the exposure time of the image sensor is less than or equal to a pre-defined exposure time while image frames are constantly acquired through the camera module, determine a suppression ratio related to an actuation range of the OIS module, based on the motion state information, and control an operation of the OIS module based on the determined suppression ratio.