Exposure Control Apparatus for Flicker Reduction
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Solution Overview
Problem
Conventional exposure control methods in imaging devices fail to effectively manage brightness variations during video shooting, leading to discomfort due to flickers or unnatural exposure changes near the appropriate exposure level.
Innovation Solution
An exposure control apparatus and method that utilize local and overall motion detection to adjust exposure settings, including a local motion brightness determination value and overall motion brightness determination value, to perform exposure control until the appropriate exposure is reached or until a predetermined deviation from the appropriate exposure is achieved, thereby adjusting the exposure resolution and timing based on detected motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If exposure control is performed continuously to maintain appropriate exposure, then exposure accuracy is improved, but flickers and discomfort occur near appropriate exposure due to excessive adjustment frequency
Solution Approach 1:
The patent implements dynamic exposure control by detecting local motion in the screen and adjusting the exposure control strategy accordingly. When local motion is detected, the system performs exposure control only when necessary rather than continuously, making the control frequency adaptive to scene conditions. This resolves the contradiction by dynamically adjusting the control intensity to maintain accuracy while avoiding excessive adjustments that cause flickers.
Solution Approach 2:
The patent applies partial action by performing exposure control selectively rather than continuously. The system determines whether exposure control is needed based on local motion detection results, applying control only in situations where it is necessary to maintain appropriate exposure. This prevents excessive control actions that would cause flickers while still ensuring accuracy when needed.
2Illumination intensity
If exposure control is performed to achieve appropriate exposure, then brightness reproduction is improved, but unnatural brightness changes occur when brightness varies near appropriate exposure
Solution Approach 1:
The system dynamically adjusts exposure control based on detected local motion. When motion is detected indicating brightness variation, the system performs exposure control to maintain appropriate exposure. When no motion is detected, the system maintains current exposure settings, ensuring brightness stability. This dynamic approach resolves the contradiction by adapting control intensity to actual scene conditions.
Solution Approach 2:
The patent implements feedback control by continuously monitoring local motion in the screen and using this information to determine whether exposure control is needed. The system feeds back the motion detection results to the exposure control decision, creating a closed-loop control system that maintains brightness reproduction accuracy while avoiding unnecessary adjustments that would cause unnatural brightness changes.
3Speed
If aperture value is adjusted frequently to follow brightness variation, then exposure responsiveness is improved, but flickers occur due to disorder in exposure control values
Solution Approach 1:
The system makes exposure control frequency dynamic based on local motion detection. When motion is detected, the system responds quickly by performing exposure control to maintain appropriateness. When no motion is detected, the system reduces control frequency to prevent flickers. This dynamic adjustment of control frequency resolves the contradiction between responsiveness and stability.
Solution Approach 2:
The system uses local motion detection within the imaging system itself to automatically determine when exposure control is needed, without requiring external input. The motion detection mechanism serves the dual purpose of both scene analysis and exposure control triggering, allowing the system to self-regulate control frequency based on actual scene conditions, thereby maintaining both responsiveness and stability.
Data Source
AI summary
An exposure control apparatus comprising: a local motion detection section which detects a local motion in a screen; a brightness detection section which detects a subject brightness; a local motion brightness determination setting section which sets a local motion brightness determination value for a local motion; and an exposure adjustment section which, when the local motion detection section has detected a motion corresponding to or exceeding a predetermined value, subsequently performs exposure control until the local motion brightness determination value is reached and, when the exposure has come closer to an appropriate exposure than the local motion brightness determination value, adjusts the exposure to a predetermined exposure value which is different from the appropriate exposure.