Projection Area Protection Using Virtual Frame Object Detection
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Solution Overview
Problem
Current projection systems face challenges in effectively detecting small objects and preventing eye damage due to excessive brightness, with existing protection mechanisms like infrared or ToF sensors either failing to detect small objects or causing false alarms and increasing costs.
Innovation Solution
A projection system that uses an image capturing device to analyze captured images, generating a virtual frame to determine if an object enters the projection area by comparing pixel values, and performs protective actions such as stopping or reducing brightness when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an excessively small number of sensors are disposed in the protection mechanism, then production cost is reduced, but the grating may not be able to detect relatively small objects such as children or pets
Solution Approach 1:
The patent replaces the mechanical sensor-based protection mechanism with an image processing system. Instead of using multiple physical sensors to form a grating, the system uses an image capturing device to capture the projected image and analyzes pixel value changes in a virtual frame to detect objects. This substitution eliminates the need for numerous sensors while maintaining or improving detection capability for small objects.
2Measurement precision
If an excessively large number of sensors are disposed in the protection mechanism, then object detection capability is improved, but it causes an excessively large number of erroneous judgment alarms and increases production cost
Solution Approach 1:
The patent replaces the complex mechanical sensor system with a simplified image processing approach. The system uses a single image capturing device to capture the projected image and processes pixel values in a virtual frame to detect objects. This eliminates the complexity of disposing and configuring multiple sensors while reducing erroneous alarms through more accurate image-based detection.
Solution Approach 2:
The patent creates a virtual frame as a digital copy or representation of the projection area in the captured image. This virtual frame serves as a computational model that allows the system to analyze pixel changes without requiring physical sensors throughout the space. The virtual frame approach simplifies the system while maintaining detection accuracy.
3Illumination intensity
If the brightness of the light source is increased to improve projection brightness, then projection quality is improved, but the likelihood of damaging eyesight of a user increases
Solution Approach 1:
The patent implements a feedback mechanism where the image capturing device continuously monitors the projection area and the processing device analyzes pixel value changes to detect objects. When an object is detected, the system provides feedback to adjust the projection, either by stopping, reducing brightness, moving, scaling down, or pausing the projected image. This closed-loop control ensures high brightness when safe while preventing eye damage when objects are present.
Data Source
AI summary
A projection system and a control method are provided. The control method includes the following. A projected image is projected on a projection area by a projection device. The projected image is captured in a detection area to generate a captured image by an image capturing device. The detection area includes the projection area. The captured image is received, a virtual frame is generated around the captured projection area in the captured image, and pixel values of the virtual frame are analyzed to determine whether an object enters the projection area by a processing device. The projection device is controlled to perform a protection operation by the processing device in response to determining that the object enters the projection area.