Imaging Apparatus Face Detection Sensor Power Management
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Solution Overview
Problem
Imaging apparatuses with face detection sensors face high power consumption, which limits their operational time, and there is a need to reduce this consumption without compromising functionality.
Innovation Solution
The imaging apparatus includes a face detection sensor, a CPU, and a memory with a program that controls the device to change operational states based on user movement and face detection, stopping the face detection sensor when no user is detected, and transitioning to lower power consumption states such as the power-saving standby state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the face detection sensor operates continuously, then the functionality of detecting user face is improved, but power consumption increases
Solution Approach 1:
The face detection sensor operates periodically rather than continuously. The control unit activates the sensor based on detected situations (movement detection, time of day, image capture events) and deactivates it during periods when detection is not needed, reducing power consumption while maintaining detection capability when required
Solution Approach 2:
The operational state of the face detection sensor is dynamically adjusted based on real-time conditions. The control unit changes the sensor's operational state between active and inactive based on movement detection results, time-based conditions, and image capture events, optimizing the balance between functionality and power consumption
2Use of energy by moving object
If the face detection sensor is stopped to reduce power consumption, then power consumption is reduced, but the ability to detect user face is compromised
Solution Approach 1:
The movement detection unit performs preliminary detection to predict when face detection may be needed. By detecting device movement in advance, the system proactively activates the face detection sensor before an actual detection request occurs, ensuring functionality is ready when needed while avoiding unnecessary continuous operation
Solution Approach 2:
The system uses feedback from the movement detection unit and time-based conditions to control the operational state of the face detection sensor. The control unit continuously monitors movement detection results and adjusts the sensor's operational state accordingly, creating a closed-loop control system that optimizes power consumption while maintaining detection capability
Data Source
AI summary
An imaging apparatus includes: a face detection sensor configured to detect a face of a user; a control unit configured to change an operational state of the imaging apparatus to a first operational state and stop an operation of the face detection sensor; and a movement detecting unit configured to detect a movement of the imaging apparatus, wherein the control unit operates the face detection sensor in response to a detection of a movement of the imaging apparatus by the movement detecting unit in the first operational state, and in a case where the face of the user is not detected by the face detection sensor in the first operational state, the control unit changes the operational state of the imaging apparatus from the first operational state to a second operational state in which power consumption is lower than that in the first operational state.