Auto-Exposure Management for Signal Content Against Dark Backgrounds
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Solution Overview
Problem
Conventional auto-exposure algorithms are inadequate for images with dark backgrounds, often overexposing brighter signal content and losing important details.
Innovation Solution
An apparatus and method that identify signal and background regions in an image frame, determine auto-exposure values and targets for each, and adjust image capture parameters to optimize exposure, preventing overexposure and preserving details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional auto-exposure algorithms adjust exposure parameters to reach target luminance, then the background areas maintain appropriate brightness, but the brighter signal content becomes overexposed and loses important details
Solution Approach 1:
The image is divided into two distinct regions: signal regions (containing brighter content of interest) and background regions. The algorithm calculates separate auto-exposure values for each region type, allowing independent optimization of exposure parameters for each area, thereby preventing overexposure of signal content while maintaining appropriate background brightness
Solution Approach 2:
Different exposure characteristics are applied to different parts of the image based on their local properties. Signal regions receive exposure treatment optimized for preserving detail in brighter areas, while background regions receive treatment optimized for achieving target luminance, creating locally optimized exposure quality throughout the image
Data Source
AI summary
An illustrative apparatus may identify, within an image frame captured by an image capture system, a signal region of the image frame and a background region of the image frame; determine one or more of a signal auto-exposure value of the signal region or a background auto-exposure value of the background region; and adjust, based on one or more of the signal auto-exposure value or the background auto-exposure value, one or more auto-exposure parameters used by the image capture system to capture an additional image frame. The identifying of the signal region and the background region may include identifying pixels of the image frame that have auto-exposure values that exceed an auto-exposure value threshold to be included within the signal region, and identifying pixels of the image frame that have auto-exposure values that do not exceed the auto-exposure value threshold to be included within the background region.