Optical Image Stabilization Operating Ratio Adjustment for Live View
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Solution Overview
Problem
Existing digital photographing apparatuses face challenges in effectively correcting hand tremors during image capture, leading to unsatisfactory photography due to hardware vibrations and sudden lens movements, which can cause vibrations and noise.
Innovation Solution
The implementation of an optical image stabilization (OIS) method that reduces the operating ratio of the OIS unit after image capture, moves the optical system while in live view mode, and initializes variables to prevent sudden movements and vibrations, using a combination of gyro and hall sensors to adjust the lens position smoothly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the OIS unit operates at full capacity (100% operating ratio) after image capture, then hand tremor correction is maximized, but hardware vibrations and noise increase
Solution Approach 1:
The OIS unit operates at full capacity only during the brief moment of image capture, then reduces to a lower operating ratio for the subsequent live view display period. This periodic operation pattern allows the system to achieve maximum tremor correction when needed while minimizing vibrations and noise during the display phase.
Solution Approach 2:
The system performs image capture with full OIS operation before the live view display begins. By completing the correction action in advance during capture, the system avoids needing to operate at full capacity during the display phase, thereby reducing vibrations and noise when the image is being viewed.
2Reliability
If the OIS unit moves the optical system immediately after image capture, then live view stabilization is improved, but sudden movements and vibrations occur
Solution Approach 1:
The optical system movement is divided into two distinct periodic phases: an initial movement phase immediately after capture to establish stabilization, followed by a reduced operation phase during live view display. This periodic action pattern prevents continuous large movements while maintaining stabilization effectiveness.
Solution Approach 2:
The operating ratio of the OIS unit is dynamically adjusted based on the operational phase. The system transitions from a high operating ratio during capture to a lower operating ratio during live view display, allowing the system to adapt its movement characteristics to different operational requirements and avoid sudden vibrations.
3Reliability
If the OIS unit maintains high operating ratio continuously, then image stabilization is maximized, but energy consumption increases
Solution Approach 1:
The OIS unit operates at high power only during the brief image capture moment, then reduces to a lower operating ratio during the extended live view display period. This periodic operation pattern significantly reduces overall energy consumption while maintaining stabilization effectiveness when actually needed.
Solution Approach 2:
The system applies full OIS operation (excessive action) only during the critical capture phase, then uses partial operation at a reduced ratio during the display phase. This approach provides more than enough stabilization during capture while avoiding unnecessary energy consumption during display.
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
This approach effectively reduces the perception of hand tremors during live view mode, preventing vibrations and noise, allowing for smoother image stabilization and improved photography preparation.
Implementation Method 1
a current location value of a gyro sensor
Implementation Method 2
a current location value of a hall sensor
Data Source
AI summary
A digital photographing apparatus includes an optical system, an optical image stabilization (OIS) unit adapted to move the optical system, and a digital signal processor in communication with the OIS unit. The digital signal processor sets an operating ratio of the OIS unit by reducing the operating ratio to a previously set value of 100% or below after a still image or a moving picture is captured, and the OIS unit moves the optical system while a live view mode is turned on.