Mobile Camera Stabilization with OIS-EIS Position Compensation
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Solution Overview
Problem
Existing image stabilization methods in mobile terminals suffer from insufficient compensation and resolution loss due to limited movement of the image capture module during optical image stabilization, and electronic image stabilization methods compromise image quality by cropping.
Innovation Solution
A method involving a driving motor to adjust the image capture module to a preset position, combined with angular velocity signals and electronic image stabilization algorithms, ensures the optical center remains unchanged by cropping if necessary and maximizing movement during optical stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one optical image stabilization method is used to control the image capture module position, then the optical center can be kept stable, but the image capture module can move only within a limited space causing insufficient compensation
Solution Approach 1:
The patent divides the image stabilization function into two independent parts: optical image stabilization (OIS) that moves the image capture module within a limited space, and electronic image stabilization (EIS) that crops the image to keep the optical center fixed. By segmenting the stabilization task, the system can maintain optical center stability through OIS while using EIS to extend the effective movement space, thus resolving the contradiction between reliability and adaptability.
2Reliability
If electronic image stabilization is used to keep the optical center fixed, then the optical center remains stable, but the resolution of the image frame is significantly reduced
Solution Approach 1:
The patent applies partial electronic image stabilization by cropping only the necessary portion of the image to maintain the optical center, rather than cropping the entire image frame. This partial action approach minimizes the resolution loss while still achieving the goal of keeping the optical center stable. The system crops only enough to compensate for the drift, preserving maximum image quality.
3Reliability
If the image capture module is allowed to move freely during hand shaking, then compensation can be applied, but the position center shifts from the initial optical center causing blurry images
Solution Approach 1:
The patent introduces the optical center as an intermediary reference point that remains fixed while the image capture module moves around it during stabilization. The system continuously monitors the position of the image capture module relative to the optical center and applies compensation to keep the optical center as the stable reference. This intermediary approach allows movement compensation while maintaining image clarity by anchoring to the fixed optical center.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Maximizes the space for image capture module movement during optical stabilization, preventing insufficient compensation and minimizing resolution loss while maintaining image clarity.
Implementation Method 1
a driving motor is controlled to drive the image capture module to move from the first position to the preset second position
Implementation Method 2
an angular velocity signal, a captured next frame image, and the first position of the image capture module are received
Data Source
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AI summary
This application discloses an image capture method and apparatus, a mobile terminal, and a storage medium, and specifically relates to the field of electronic devices. In a case that a first position of an image capture module is recognized as not being at a preset second position in a frame gap of image capture, a driving motor is controlled to drive the image capture module to move from the first position to the preset second position; an angular velocity signal, a captured next frame image, and the first position of the image capture module are received during a capture period of the next frame image of the image capture; in a case that the first position of the image capture module has not returned to the preset second position, the captured next frame image is cropped according to the first position, the preset second position, the angular velocity signal, and a preset electronic image stabilization algorithm; and in a case that the first position has returned to the preset second position, the driving motor is controlled, based on the angular velocity signal and the first position of the image capture module, to perform an optical image stabilization operation.