Face Orientation Detection for Screen Brightness Control
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Solution Overview
Problem
Existing human presence detection systems face challenges in accurately and promptly adjusting screen brightness based on face orientation changes, leading to delayed responsiveness and increased power consumption.
Innovation Solution
An information processing apparatus and method that utilizes face detection processing to determine face orientation and movement, adjusting screen brightness by anticipating face orientation changes within specific angle ranges and adjusting detection cycles based on face movement distance and angle changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If face detection processing waits for the face to fully enter the first angle range before determining front-facing orientation, then detection accuracy is improved, but responsiveness is degraded with approximately one second delay
Solution Approach 1:
The system performs preliminary face orientation change detection by monitoring when the face enters a second angle range (wider than the first angle range) and predicts that the face will soon enter the first angle range. This preliminary action triggers brightness restoration before the face fully enters the first angle range, reducing the one-second delay while maintaining reasonable detection accuracy.
Solution Approach 2:
The system dynamically adjusts detection sensitivity based on the face's current angle range. When the face is in the second angle range (outside but near the first angle range), the system uses a more sensitive detection threshold that triggers on orientation changes rather than requiring full entry into the first angle range. This dynamic adjustment balances responsiveness with accuracy.
2Loss of energy
If the system reduces screen brightness when face orientation turns away from front-facing, then power consumption is reduced, but user experience deteriorates due to delayed brightness restoration when face returns
Solution Approach 1:
The system restores screen brightness in advance when detecting that the face orientation is changing toward the front-facing position (entering the second angle range), rather than waiting for the face to fully return to the first angle range. This preliminary brightness restoration improves user experience by eliminating the perceptible delay, while the brightness is only fully restored when the face actually enters the first angle range to avoid premature restoration.
Solution Approach 2:
The system prepares for the upcoming brightness restoration need by detecting face orientation trends early. When the face begins moving from side-facing toward front-facing (detected as entering the second angle range), the system anticipates the user's need for full brightness and begins preparation, counteracting the potential negative user experience before it occurs.
Data Source
AI summary
An information processing apparatus includes: a memory which temporarily stores image data of an image captured by an imaging unit; and a processor which processes the image data stored in the memory. The processor performs: face detection processing to process the image data of the image stored in the memory in order to detect a face area with a face captured therein and an orientation of the face from the image, and brightness control processing to control screen brightness of a display unit based on the orientation of the face detected by the face detection processing.