Variable Shutter Speed Control for Camera Shake Reduction
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Solution Overview
Problem
Conventional digital cameras face limitations in reducing blurriness due to camera shakes, with existing solutions either restricting exposure settings or being ineffective for still images, and they struggle to correct blurs caused by subject movement without using angular-velocity sensors.
Innovation Solution
The implementation of a digital camera system with a shake detection section that predicts camera shakes and adjusts the maximum shutter speed based on focal length, allowing for a wider range of exposure settings, and a blur detection section that predicts subject movement blurs, enabling exposure control without an angular-velocity sensor, and optionally includes a face recognition feature for focused exposure adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed maximum shutter speed is set based on blur correction device performance limits, then blurriness of subject image can be reduced, but the range of selectable exposure conditions is limited
Solution Approach 1:
The patent applies dynamics by making the maximum shutter speed variable rather than fixed. The exposure control section dynamically adjusts the maximum shutter speed based on detected subject brightness, allowing the system to adapt between different exposure scenarios. When subject brightness is high, a longer maximum shutter speed is permitted; when brightness is low, a shorter maximum shutter speed is enforced to prevent blur, thus resolving the contradiction between blur reduction and exposure flexibility.
Solution Approach 2:
The patent changes the parameter of maximum shutter speed based on subject brightness conditions. By detecting subject brightness and adjusting the maximum shutter speed parameter accordingly, the system can optimize between preventing blur (when brightness is low) and allowing creative exposure control (when brightness is high), thereby resolving the contradiction between image quality and exposure versatility.
2Manufacturing precision
If a shorter shutter speed is used to prevent camera shake blur, then image clarity is improved, but exposure time is reduced which may cause underexposure
Solution Approach 1:
The patent adjusts the maximum shutter speed parameter based on subject brightness detection. When subject brightness is high, the system allows longer shutter speeds that provide sufficient exposure time without causing blur. When subject brightness is low, the system enforces shorter shutter speeds to prevent blur while accepting the need for higher ISO or wider aperture. This dynamic parameter adjustment resolves the contradiction between image clarity and adequate exposure.
3Manufacturing precision
If the maximum shutter speed is lowered according to blur correction device limits, then subject image blurriness is reduced, but the shooting flexibility for different lighting conditions is restricted
Solution Approach 1:
The patent implements dynamics by making the maximum shutter speed adaptive rather than static. The exposure control section responds to real-time subject brightness detection, dynamically setting appropriate maximum shutter speeds. This allows the system to maintain strict shutter speed limits in low-light conditions to prevent blur while permitting more flexible, longer shutter speeds in bright conditions where blur risk is lower, thus resolving the contradiction between blur prevention and shooting flexibility.
Solution Approach 2:
The patent employs feedback by detecting subject brightness and using this information to adjust the maximum shutter speed setting. The exposure control section continuously monitors lighting conditions and adapts the shutter speed parameter accordingly, creating a closed-loop control system that resolves the contradiction between maintaining image clarity and providing shooting flexibility for varying lighting conditions.
Data Source
AI summary
An image-taking apparatus includes an imaging device and a shooting lens of variable foal length, and generates image signals by forming a subject image entering through the shooting lens on the imaging device. The apparatus includes an angular-velocity sensor that predicts a shake that will occur at shooting by detecting a shake before shooting. The apparatus also includes a main CPU that controls exposure by adopting a shutter speed within a maximum shutter speed. The maximum shutter speed can be changed according to a result of shake detection and a focal length of the shooting lens to be used at shooting.