Projection Plane Light Switching for Biometric Position Capture
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Solution Overview
Problem
Existing biometric authentication systems struggle to capture a user at an appropriate position when the imaging device and the user are separated by a transparent projection plane, such as a window.
Innovation Solution
Control the light transmission of the projection plane between transparent and transparency-suppressed states to synchronize image capture and projection, allowing the imaging device to capture the user in a transparent state and project a guide image in a suppressed state, facilitating accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projection plane is kept transparent to allow the imaging device to capture the user, then the user can be captured at the correct position, but the guide image cannot be projected onto the plane
Solution Approach 1:
The projection plane periodically alternates between transparent and transparency-suppressed states. During the transparent state, the imaging device captures the user. During the transparency-suppressed state, the guide image is projected onto the plane. This periodic switching resolves the contradiction by providing separate time windows for both functions.
Solution Approach 2:
The guide image is projected onto the projection plane in advance (during the transparency-suppressed state) before the user capture occurs (during the transparent state). This allows the user to see the guide image and position themselves correctly before the actual capture, ensuring accurate positioning while maintaining guide image visibility.
2Adaptability or versatility
If the projection plane switches between transparent and transparency-suppressed states, then both image capture and projection can occur, but flickering may cause user discomfort
Solution Approach 1:
The system uses periodic switching between transparent and transparency-suppressed states with carefully controlled timing. The switching frequency and duration are optimized to perform both capture and projection functions while minimizing perceptible flickering that would cause user discomfort.
Solution Approach 2:
The projection plane's light transmission property is dynamically adjusted between transparent and transparency-suppressed states. This dynamic control allows the system to adapt the plane's optical properties in real-time to meet the requirements of both image capture and guide image projection while managing the transition effects to reduce flickering.
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
Enables effective biometric authentication by ensuring the user is captured at the correct position, reducing discomfort from flickering, and allowing clear visualization of the guide image for proper alignment.
Implementation Method 1
light transmission of the projection plane is controlled to be in a transparent state
Data Source
AI summary
A control is performed such that an imaging device captures an image of an imaging target located across a projection plane at a timing when light transmission of the projection plane is controlled to be in a transparent state, and a control is performed such that a projection image is projected onto the projection plane at a timing when the light transmission of the projection plane is controlled to be in a transparency suppressed state.