Camera System Dynamic Exposure Control for Brightness Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Camera systems face challenges in adjusting exposure and white balance quickly enough to changing lighting conditions without causing discomfort through excessive brightness fluctuations, especially during video recording where sudden changes can result in an undesirable 'pumping effect'.
Innovation Solution
An intelligent control architecture that analyzes motion and lighting conditions using a motion analyzer and lighting condition analyzer to adjust diaphragm, shutter speed, and amplification accordingly, dividing frames into macroblocks to determine necessary adjustment rates, thereby optimizing exposure and white balance adjustments based on scene stability and motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the camera quickly adjusts exposure time or white balance in response to changing lighting conditions, then the responsiveness to lighting changes is improved, but the brightness stability deteriorates causing pumping effect
Solution Approach 1:
The camera system dynamically adjusts the responsiveness of exposure and white balance parameters based on detected motion in the scene. When motion is detected, the system reduces the adjustment speed of brightness parameters to prevent pumping effect, while maintaining quick response capability when the scene is stable. This dynamic adaptation resolves the contradiction between quick responsiveness and brightness stability.
2Measurement precision
If the exposure time is increased to capture details in dark environments, then the image quality in low light is improved, but the brightness fluctuation increases causing discomfort
Solution Approach 1:
The system continuously monitors both lighting conditions and scene motion, using this feedback to intelligently control exposure adjustments. When motion is detected, the system limits the rate of exposure time changes even when transitioning to dark environments, ensuring smooth brightness transitions while still capturing sufficient detail. This feedback mechanism resolves the contradiction between low-light image quality and brightness consistency.
Data Source
Figure 1
Figure 2a~2d
Figure 3
AI summary
According to one aspect of the present invention, there is provided a camera system including a motion estimator estimating a motion of an image taken by the camera system and a controller controlling, based on the estimation, an update frequency of a predetermined parameter and/or an amount of adjustment of the predetermined parameter per update cycle.