Live View Exposure Control for Consistent Brightness
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Solution Overview
Problem
Conventional image capturing apparatuses do not effectively control exposure conditions for live view images based on selected display modes, leading to inconsistent brightness during live view display, which can be unsuitable for user purposes.
Innovation Solution
An image capturing apparatus and control method that dynamically adjust exposure conditions by using a system controller to manage aperture and shutter settings based on selected live view display modes, employing exposure hold values to maintain optimal brightness levels for each mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If exposure conditions are controlled for live view display, then brightness consistency is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The system controller performs multiple functions: it controls both the aperture mechanism and shutter mechanism, and manages both still image shooting and live view display operations. By making the controller universal, the patent avoids adding separate dedicated control units for each function, thus improving brightness consistency without proportionally increasing device complexity.
Solution Approach 2:
The patent dynamically adjusts exposure parameters (aperture value and shutter speed) based on the selected display mode. The controller changes these parameters in real-time to maintain appropriate brightness levels for different modes (EVF, through-display, etc.), resolving the brightness consistency issue through parameter optimization rather than structural complexity.
2Adaptability or versatility
If multiple display modes are supported, then adaptability is improved, but control complexity increases
Solution Approach 1:
The system dynamically adapts exposure conditions based on the selected display mode. Rather than having separate fixed control circuits for each mode, the controller dynamically adjusts aperture and shutter parameters according to the active mode (EVF, through-display, etc.), achieving versatility through dynamic adaptation rather than static multi-structure design.
Solution Approach 2:
A single system controller handles all display modes (EVF, through-display, and other modes) and both shooting types (still images and live view). This universal controller approach allows multiple display modes to be supported without proportionally increasing control complexity, as the same hardware performs multiple functions through software/control logic management.
3Measurement precision
If aperture and shutter are adjusted during live view, then exposure accuracy is improved, but image stability deteriorates due to frequent adjustments
Solution Approach 1:
The controller performs preliminary exposure determination based on the selected display mode before actual image capture. By pre-calculating appropriate aperture and shutter values for the specific mode (EVF, through-display, etc.), the system achieves exposure accuracy without needing frequent adjustments during live view, thus maintaining image stability.
Solution Approach 2:
The system dynamically adjusts aperture and shutter parameters based on real-time conditions and selected mode, but once set, maintains these parameters stable during the live view period. This dynamic-initial-then-stable approach ensures exposure accuracy is achieved through initial adaptive setting, while subsequent stability is maintained by avoiding unnecessary adjustments.
Data Source
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AI summary
In an image capturing apparatus that is capable of selecting a display mode for live view display from multiple display modes, the difference between a measured subject brightness and an image brightness obtained from an exposure condition for acquiring live view images is obtained. Then, exposure conditions for acquiring the live view images are changed depending on a threshold corresponding to the selected display mode and on the value of the obtained difference. The image capturing apparatus allows for control of the exposure conditions for acquiring the live view images in accordance with the selected live view display mode.