Interactive Projector Z-Coordinate Correction for Contact Detection
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Solution Overview
Problem
Existing interactive projectors face challenges in accurately detecting contact between a pointing element and the screen surface due to insufficient detection accuracy, which affects user input precision.
Innovation Solution
The interactive projector employs a detection system that corrects Z-coordinate values of the pointing element and the screen surface based on historical data, using triangulation with multiple cameras and histogram analysis to improve contact detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Z-coordinate values are used to detect contact between pointing element and screen surface, then contact detection can be performed, but detection accuracy is insufficient due to coordinate shifts
Solution Approach 1:
The system continuously monitors Z-coordinate values and uses historical data to detect shifts in the coordinate system. When a shift is detected, the system automatically corrects the Z-coordinate values to maintain accurate contact detection. This feedback mechanism ensures that despite initial coordinate shifts, the system adapts and maintains high detection accuracy and reliability.
Solution Approach 2:
The system dynamically adjusts the threshold value used for contact detection based on historical Z-coordinate data. By changing this parameter adaptively, the system compensates for coordinate shifts and maintains accurate contact detection even when the absolute Z-coordinate values change due to system drift or environmental factors.
2Measurement precision
If multiple cameras are used for triangulation to detect three-dimensional coordinates, then position detection capability is improved, but device complexity increases
Solution Approach 1:
The multiple cameras in the system serve dual purposes: they are used for triangulation to detect the three-dimensional position of the pointing element, and simultaneously for detecting the position and orientation of the screen surface. This multi-functionality justifies the use of multiple cameras without proportionally increasing system complexity, as the same hardware components perform multiple detection tasks.
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 accuracy of contact detection, ensuring precise user input by accounting for shifts in Z-coordinate values and improving the reliability of contact determination.
Implementation Method 1
the detection section may detect the three-dimensional coordinate value of the pointing element with triangulation using a plurality of images including the pointing element taken by the plurality of cameras
Data Source
AI summary
An interactive projector is provided with a projection section adapted to project an image on a screen surface, a detection section, and a correction section. The detection section detects presence or absence of contact of the pointing element with the screen surface based in a relationship between a difference between a Z-coordinate value of the pointing element and a Z-coordinate value of the screen surface, and a difference threshold value set in advance. The correction section corrects at least one of the Z-coordinate value of the screen surface, the Z-coordinate value of the pointing element, and the difference threshold value based on a history of the Z-coordinate value of the pointing element.