XR Camera Exposure Control via Display Buffer and Environment Data
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Solution Overview
Problem
Extended reality (XR) systems face challenges in automatically configuring image capture settings for user-facing sensors, particularly in rapidly changing lighting conditions, which can result in inappropriate exposure settings and poor image quality.
Innovation Solution
The XR system receives capture information from an environment-facing camera and display buffer data, using this information to determine image capture settings for a user-facing camera, including exposure settings, based on luminance measurements and prior capture information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the XR system uses traditional automatic exposure configuration for user-facing sensors, then the system structure remains simple, but the image capture settings become inappropriate in rapidly changing lighting conditions
Solution Approach 1:
The system performs preliminary analysis of display buffer data and environment-facing camera information before configuring the user-facing sensor exposure settings. By predicting lighting conditions in advance based on display content and environmental data, the system can pre-adjust exposure parameters before the actual image capture, improving adaptability without requiring complex real-time sensing mechanisms.
Solution Approach 2:
The system introduces display buffer data and environment-facing camera information as intermediary elements that mediate between the lighting environment and the user-facing sensor configuration. These intermediaries provide indirect information about lighting conditions, allowing the system to determine appropriate exposure settings without directly sensing the user-facing lighting environment, thus maintaining relatively simple system architecture while achieving good adaptability.
2Manufacturing precision
If the XR system adjusts image capture settings rapidly to match changing lighting conditions, then image quality improves, but processing delays increase
Solution Approach 1:
The system performs exposure configuration based on display buffer data and environment-facing camera information before the actual image capture occurs. By analyzing these data sources in advance and pre-determining the optimal exposure settings, the system reduces the processing time required during actual image capture while maintaining high image quality through accurate exposure configuration.
Solution Approach 2:
The system uses display buffer data as a copy or representation of the actual display content that will be shown to the user. By analyzing this copy of the display content along with environment-facing camera data, the system can determine exposure settings without requiring additional real-time sensing and processing, thus reducing delays while maintaining image quality.
3Speed
If the XR system relies solely on prior capture information from the second camera, then the system operation remains simple, but the response to rapidly changing lighting conditions becomes slow
Solution Approach 1:
The system merges multiple information sources including display buffer data, environment-facing camera information, and prior capture information from the user-facing sensor. By combining these diverse data sources, the system achieves faster response to lighting changes through more comprehensive information analysis, while the integration is managed through a unified processing framework that prevents excessive complexity.
Solution Approach 2:
The system uses a multi-functional approach where the same processing framework analyzes various types of input data (display buffer, environment-facing camera, prior capture information) to determine exposure settings. This universal processing mechanism handles different data sources consistently, improving response speed through comprehensive analysis while avoiding the complexity of separate processing paths for each data type.
Data Source
AI summary
An extended reality (XR) system receives capture information from a first camera with a first image sensor that faces a first direction, for instance facing an environment. The capture information is associated with capture of first image data by the first image sensor, for instance including the first image data and/or first image capture settings used to capture the first image data. The XR system determines an image capture setting, such as an exposure setting, for a second image sensor based on the capture information. The second image sensor faces second direction, for instance facing a user of the XR system. In some examples, the XR system determines the image capture setting also based on information from a display buffer for a display that faces the second direction. The XR system causes a second image sensor to capture second image data according to the image capture setting.