Imaging Device Shutter Speed Series and Live View Mode Control
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Solution Overview
Problem
Imaging devices face challenges in effectively mitigating the occurrence of lateral stripes caused by flickering fluorescent light sources, particularly when photographing under conditions with power supply frequencies of 50 Hz or 60 Hz, as existing methods may not adequately address the issue of flicker-induced image distortion.
Innovation Solution
The imaging device incorporates a controller that allows for the selection between two shutter speed series, with a finer step in the second series, and adjusts the live view display mode to either read all pixels or perform addition/thinning-out pixel reading, enabling the user to visually recognize and set the shutter speed to minimize flicker effects, including an enlarged live view mode for precise identification of lateral stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-speed shutter speed is used to suppress flicker, then lateral stripes are reduced, but followability and visibility of moving subjects deteriorate
Solution Approach 1:
The patent applies dynamics by making the shutter speed series changeable based on imaging conditions. The controller switches between a first shutter speed series (coarser steps, lower speeds) for moving subjects and a second shutter speed series (finer steps, higher speeds) for still subjects, optimizing both followability and flicker suppression dynamically
Solution Approach 2:
The patent changes the parameter of shutter speed series from fixed to variable. By switching between two different shutter speed series with different step sizes and speed ranges, the system adapts to different imaging scenarios (moving vs. still subjects) to balance followability and flicker reduction
2Measurement precision
If pixel equal magnification display is used to detect lateral stripes, then measurement precision improves, but device complexity and processing load increase
Solution Approach 1:
The patent applies partial action by displaying only the necessary magnification level for flicker detection. The controller selectively switches to pixel equal magnification display only when flicker is detected, rather than continuously maintaining high magnification, thus reducing overall processing load while ensuring detection capability when needed
Solution Approach 2:
The system performs self-diagnosis by automatically detecting flicker conditions and switching to the appropriate shutter speed series and display magnification without user intervention, reducing the need for complex user interfaces and manual adjustments
3Object-affected harmful factors
If flicker suppression is prioritized with high shutter speeds, then image quality improves, but temperature and noise in imaging element increase
Solution Approach 1:
The patent changes the shutter speed parameter dynamically based on subject type. By using lower shutter speeds from the first series for moving subjects and higher speeds from the second series only for still subjects, the system minimizes unnecessary high-speed operation that generates heat and noise while still suppressing flicker when needed
Data Source
AI summary
An imaging device includes an imaging unit, a controller, and a display. The controller changes a shutter speed series to any one of a first shutter speed series and a second shutter speed series. The controller controls an exposure time of the imaging unit according to the first shutter speed series or the second shutter speed series. The controller changes a live view display mode to any of a first live view display mode and a second live view display mode. The first live view display mode has at least an enlarged live view display mode and a normal magnification live view mode. The enlarged live view display mode is a mode in which a part of the digital image is cut out to be displayed at an enlargement magnification substantially equal to or more than a pixel equal magnification.