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 suffer from high power consumption, particularly in battery-operated devices, as they do not effectively manage infrared light emission.
Innovation Solution
Incorporating an infrared light emission control section that controls the emission of infrared light based on face detection results, stopping and resuming emission after a predetermined time period, and using a motion sensor to adjust emission accordingly, thereby reducing power consumption while maintaining convenience for face detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrared light is continuously emitted for face detection, then face detection accuracy is maintained, but power consumption increases
Solution Approach 1:
The infrared light emitter operates periodically rather than continuously. The control section stops infrared light emission after successful face detection and resumes emission after a predetermined time period elapses, creating a periodic on-off cycle that reduces power consumption while maintaining detection capability
Solution Approach 2:
The system uses feedback from face detection results to control infrared light emission. When face detection succeeds, the control section receives this information and stops infrared light emission. The feedback mechanism allows the system to adapt emission based on actual detection needs, avoiding unnecessary power consumption
2Use of energy by moving object
If infrared light emission is stopped to reduce power consumption, then power consumption decreases, but face detection convenience deteriorates
Solution Approach 1:
The system performs preliminary face detection using existing images before stopping infrared light emission. The control section determines whether to stop emission based on prior detection results, ensuring face detection convenience is maintained before transitioning to power-saving mode
Solution Approach 2:
The infrared light emission state is dynamic rather than static. The system transitions between emission and non-emission states based on detection results and elapsed time, allowing the system to adapt between power consumption and detection convenience requirements
3Use of energy by moving object
If the predetermined time period is extended to reduce power consumption, then power consumption decreases, but response time increases
Solution Approach 1:
The predetermined time period is set to a specific optimized value that balances power consumption and response time. By carefully selecting this parameter, the system achieves adequate power savings while maintaining acceptable response time for face detection functionality
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 ensuring quick and accurate face detection, even in changing light conditions, by optimizing the use of infrared light emission in hand-held information processing devices.
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, first, an image taken by use of the camera is obtained. A face detection process based on the image is repeatedly executed. Then, based on a result of the face detection process, emission of the infrared light is stopped and emission of the infrared light is resumed after a lapse of a predetermined time period.