Line-of-Sight Camera Exposure Control for Stable AR Brightness
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Solution Overview
Problem
Augmented reality devices using the video see-through method face temporal delays in adjusting exposure values when object regions rapidly change, leading to inconsistent image brightness.
Innovation Solution
An electronic device equipped with a first camera for capturing a wide-angle base image, a second camera for capturing a line-of-sight image, and a motion sensor to determine exposure values based on light quantity and motion information, allowing for real-time adjustment of exposure settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If exposure value is adjusted in real-time when line-of-sight changes, then image brightness consistency is improved, but temporal delay in exposure control increases
Solution Approach 1:
The patent applies preliminary action by predicting the future line-of-sight direction based on current motion state and using this prediction to determine exposure values in advance. The processor predicts where the line-of-sight will point and pre-determines the appropriate exposure setting for that predicted direction, eliminating the need to wait for actual line-of-sight changes to trigger exposure adjustments.
2Speed
If exposure value is adjusted rapidly when object region changes, then response speed is improved, but image brightness stability deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual line-of-sight direction and comparing it with the predicted direction. The processor uses this feedback information to adjust the exposure value determination, ensuring that the exposure settings remain stable and accurate despite rapid changes in viewing direction. The feedback mechanism allows for real-time refinement of exposure control without causing instability.
Data Source
AI summary
An electronic device, including: a first camera configured to capture a base image with respect to a space corresponding to the electronic device; a second camera configured to capture a line-of-sight image corresponding to a line-of-sight direction; a motion sensor; at least one processor; and a memory storing at least one instruction which, when executed by the at least one processor, causes the electronic device to: obtain light quantity information about a light quantity associated with the space, based on the base image; and determine, based on motion information obtained by the motion sensor and the light quantity information, an exposure value for capturing the line-of-sight image