Display Power Control via Moving Body and Face Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in accurately determining user presence for power save control, leading to unnecessary power consumption and delayed response due to reliance on face detection alone or incorrect judgments with moving body detection, especially in environments with restricted computation resources.
Innovation Solution
A display device combining moving body detection and face detection to control power consumption through multiple modes, adjusting brightness, sound volume, and image quality based on the presence of a face and moving body, with automatic mode selection and notification of power control status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If face detection is used for power save control, then power consumption can be reduced when no user is present, but the response time is delayed due to long image processing time and the display may be turned off incorrectly when user presence cannot be detected
Solution Approach 1:
The system performs moving body detection in advance before face detection. When a moving body is detected, the system prepares for potential face detection, allowing faster transition to display activation. This preliminary action reduces the effective response time while maintaining accurate power save control through the two-stage detection approach.
2Loss of energy
If face detection is used for power save control, then power consumption can be reduced, but the detection accuracy deteriorates when the user looks away or the face is difficult to detect due to installation environment
Solution Approach 1:
The system merges moving body detection and face detection into a unified power save control mechanism. The moving body detection serves as a preliminary indicator of user presence, while face detection provides confirmation. This combination allows the system to maintain high detection accuracy even when face detection alone fails due to environmental factors or user behavior.
Solution Approach 2:
Moving body detection acts as an intermediary between the imaging device and the final power save decision. When face detection is uncertain or fails, the moving body detection provides additional evidence to determine user presence, thereby improving overall detection accuracy without requiring continuous high-power face detection.
3Loss of time
If only moving body detection is used for power save control, then response time is improved, but the system erroneously judges user absence when the user keeps viewing without moving, leading to incorrect display turn-off
Solution Approach 1:
The system uses face detection as a feedback mechanism to verify user presence after moving body detection indicates activity. When a moving body is detected, the system performs face detection to confirm whether the user is actually present and viewing. This feedback loop prevents erroneous turn-off decisions while maintaining fast response times through the hierarchical detection approach.
Data Source
AI summary
Provided is a display device including an imaging unit that captures a moving image in a predetermined range in an image display direction, a moving body detection unit that detects whether or not a moving body is present in a predetermined range in the image display direction, an image analysis unit that analyzes the moving image captured by the imaging unit to detect whether or not a face is present, and a power control unit that controls power consumption with different patterns according to a plurality of modes that are set by combining whether or not the face detected by the image analysis unit is present and whether or not the moving body detected by the detection unit is present.