Aerial Display Centroid Position Detection
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Solution Overview
Problem
Conventional aerial touch display systems face inaccuracies in position detection due to variations in finger thickness and depth, leading to difficulties in precise operation.
Innovation Solution
A spatial image display apparatus that uses a position detection sensor and imaging optical system to calculate the effective centroid position of an object traversing a spatial image, emitting infrared rays and detecting reflected light to accurately determine the intended position, even with changing finger diameter and depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a physical sensor is used to detect finger position in an aerial display, then the position can be detected, but the detection precision deteriorates due to variations in finger thickness and penetration depth
Solution Approach 1:
The patent transitions from detecting only the 2D position of finger contact to detecting 3D spatial information including depth. By using a camera to capture the aerial image and calculate the effective centroid position in three-dimensional space, the system compensates for variations in finger thickness and penetration depth, thereby maintaining high position detection precision across different finger conditions.
2Loss of information
If the sensor detects light reflection from the finger surface, then position information can be obtained, but the accuracy deteriorates because the reflective surface varies with finger cross-sectional area and depth
Solution Approach 1:
The patent introduces an intermediary computational process - calculating the effective centroid position based on the aerial image captured by the camera. This intermediary calculation serves as a mediator that translates variable light reflection patterns (caused by different finger shapes and depths) into a stable, accurate position representation, thereby preventing information loss about the true contact position.
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 enhances the precision of input operations by accurately determining the intended position, allowing for more reliable interaction with aerial displays despite variations in finger dimensions.
Implementation Method 1
emitting infrared rays and detecting reflected light to accurately determine the intended position
Data Source
AI summary
An spatial image display apparatus and method for displaying a spatial image in an aerial space, sensing an object traversing the spatial image, calculating the position of the object's effective centroid, and performing an input operation is disclosed. The spatial image display apparatus detects distances from the object's surface thrust into the aerial display to more precisely determine the position on the spatial image at which the user intends to indicate.