Infrared Light Emission Control for Face Detection Power Savings
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Solution Overview
Problem
Conventional information processing systems that use infrared light for face detection in hand-held devices suffer from high power consumption, particularly in battery-operated devices, due to continuous emission of infrared light regardless of necessity.
Innovation Solution
Incorporating an infrared light emission control system that dynamically turns the infrared light on and off based on face detection success and ambient light conditions, using a camera and motion sensor to optimize power usage by stopping emission when not necessary, and gradually increasing the interval between emission stops to balance accuracy and power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared light is continuously emitted for face detection, then face detection accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the infrared light emission state changeable between ON and OFF based on detection results and environmental conditions. The system dynamically adjusts the emission state rather than maintaining a fixed continuous emission, thereby reducing power consumption while preserving detection accuracy when needed.
Solution Approach 2:
The patent implements feedback mechanisms where the face detection result and ambient light detection result are fed back to control the infrared light emission. When face detection succeeds or ambient light is sufficient, the system stops infrared emission, creating a closed-loop control system that optimizes power usage based on actual detection needs.
2Use of energy by moving object
If infrared light emission is stopped to reduce power consumption, then power consumption decreases, but face detection accuracy may deteriorate
Solution Approach 1:
The patent applies preliminary action by performing ambient light detection before stopping infrared light emission. This preliminary check ensures that infrared light is only stopped when sufficient ambient light is available, preventing deterioration of face detection accuracy. The system proactively verifies conditions before changing the emission state.
Solution Approach 2:
The system maintains dynamic adaptability by continuously monitoring both face detection results and ambient light conditions, adjusting the infrared emission state accordingly. This dynamic control ensures detection accuracy is maintained when needed while enabling power savings when conditions permit.
3Use of energy by moving object
If infrared light is stopped after successful face detection, then power consumption is reduced, but detection reliability in changing environments may worsen
Solution Approach 1:
The patent implements periodic action by repeatedly executing the face detection process even after stopping infrared light emission. This periodic detection ensures that if environmental conditions change and infrared light becomes necessary again, the system can quickly detect and respond, maintaining detection reliability while reducing power consumption during stable periods.
Solution Approach 2:
The system uses feedback from repeated face detection attempts to determine whether to resume infrared light emission. If face detection fails after stopping emission, the feedback triggers resumption of infrared light, ensuring detection reliability is maintained in changing environments while optimizing power usage during stable conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces power consumption while maintaining face detection accuracy, especially in devices transitioning from dark to light environments, thereby extending battery life and enhancing user convenience.
Implementation Method 1
an infrared light emitter capable of emitting infrared light
Implementation Method 2
reflected light of the emitted infrared light is detected to be outputted as an infrared light image
Data Source
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AI summary
An example information processing apparatus including an infrared light emitter capable of emitting infrared light and a camera capable of at least taking an infrared light image is provided. In the information processing apparatus, when face detection by a face detection section has been successful with the infrared light emitted, emission of the infrared light is stopped, and a face detection process with the emission stopped is executed. As a result, when face detection has been successful, the face detection process is continued with emission of the infrared light stopped, and when face detection has been failure, the infrared light is emitted and the face detection process is continued.