Projector Human Presence Detection with Phased Warning Logic
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Solution Overview
Problem
Existing projector systems display a warning image every time a human is detected, which can hinder the viewing of the projection image and lead to unnecessary warnings.
Innovation Solution
A method and system for a projector that detects human presence, emits a sound warning, and determines if the detection continues for a specified time period, projecting a first image with a warning if presence is sustained and a second image without the warning if presence is temporary, thereby minimizing interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projector displays a warning image every time a human is detected, then the human presence warning reliability is improved, but the viewing quality of the projection image deteriorates due to frequent interruptions
Solution Approach 1:
The system performs preliminary detection and sound warning before displaying the warning image. When a human is first detected, the projector emits a sound warning and waits for a predetermined time period. Only if detection continues during this period does it proceed to display the warning image. This preliminary action sequence reduces unnecessary image disruptions while maintaining reliable human presence detection.
2Reliability
If the projector emits continuous sound warnings, then the human presence warning reliability is improved, but the annoyance to viewers increases
Solution Approach 1:
The system uses periodic detection at predetermined time intervals rather than continuous monitoring. The projector detects human presence, emits a sound warning, then waits for a predetermined time period before checking again. This periodic action pattern reduces continuous sound output and viewer annoyance while maintaining reliable detection through repeated checks.
3Reliability
If the projector displays warning image immediately upon detection, then the warning effectiveness is improved, but the light source life deteriorates due to extended operation in warning mode
Solution Approach 1:
The system performs preliminary detection and sound warning before activating the warning image display. By requiring detection to continue for a predetermined time period before displaying the warning image, the system reduces unnecessary extended operation in warning mode, thereby preserving light source life while maintaining effective warning capability when truly needed.
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 allows for phased warnings, reducing unnecessary image disruptions and extending the life of the projector's light source while providing effective visual alerts to humans in the projection area.
Implementation Method 1
a sensor configured to detect whether a human is present or absent between a projection surface and the projector
Data Source
AI summary
A method of controlling a projector includes detecting whether a human is present or absent between a projection surface and the projector, emitting a first sound when it is detected that the human is present, determining whether or not detecting that the human is present continues during a first period having a first time length, projecting, by the projector, a first projection image including a first image on the projection surface when it is determined that the detecting that the human is present continues, and projecting, by the projector, a second projection image not including the first image on the projection surface when it is determined that the detecting that the human is present does not continue.