Presence Detection Using Image Zone Luminance Analysis
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Solution Overview
Problem
Modern electronic devices face challenges in efficiently detecting user presence to prevent premature entry into power saving modes and to wake up automatically without user interaction, especially in environments with varying lighting conditions.
Innovation Solution
An image system with a control circuitry that divides images into zones to calculate average luminance values, enabling presence detection by comparing reference and current frames, and adjusting power modes accordingly, while also managing auto-exposure to prevent false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device enters power saving mode to conserve energy, then energy consumption is reduced, but the device cannot automatically detect user presence and requires manual wake-up actions
Solution Approach 1:
The system performs preliminary actions by capturing image frames and detecting user presence before the device enters power saving mode. The image system continuously monitors for user presence in the field of view, and if a user is detected, the device prevents entry into power saving mode or automatically wakes up from it, eliminating the need for manual wake-up actions
Solution Approach 2:
The image system serves as an intermediary between the user and the device's power management system. It detects user presence through image analysis and communicates this information to the processor, which then makes decisions about power mode transitions, enabling automatic response to user presence without requiring direct user interaction with the device
2Extent of automation
If the image system continuously monitors for presence to enable automatic wake-up, then automation is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic action by capturing image frames at specific intervals or triggered events. The image system can operate in a lower power state between frame captures, only activating full processing when needed, thus reducing overall energy consumption while maintaining automatic presence detection capability
Solution Approach 2:
The system applies partial action by using only the necessary portion of the image processing capability for presence detection rather than full image analysis. It focuses computational resources on detecting presence in the field of view without performing complete image processing, reducing energy consumption while maintaining detection effectiveness
3Measurement precision
If the device activates all components for presence detection, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The system segments the detection task by dividing the image into zones and calculating average luminance values for each zone rather than processing every pixel. This segmentation approach maintains detection accuracy by focusing on key areas while reducing the computational load and power consumption associated with full-image processing
Data Source
AI summary
Systems and methods are provided for presence detection using an image system. The image system may be a camera that is integrated into an electronic device. In some embodiments, the image system can accommodate multiple operating modes of the electronic device. For example, when the electronic device is operating in a normal power mode, control circuitry of the image system can detect when a user has left and is no longer using the electronic device. When the electronic device is operating in a power saving mode, the control circuitry can detect user presence (e.g., when a user has come back to the electronic device). In some embodiments, the control circuitry can adjust for both gradual and sudden light changes.