Virtual Keyboard for a Back Projection Desk
Date Issued
2006
Date
2006
Author(s)
Yang, Huei-Jing
DOI
zh-TW
Abstract
We project a virtual keyboard on the desktop of the back projection desk and put two cameras in the upper side and in the lower side of the desk. The two cameras work together to detect the user's keystroke. At first, the relation between the standard keyboard and the upper camera and the relation between the lower camera and the upper camera are built. The pre-defined position for each key on standard keyboard can be transformed to the coordinates of the lower camera and the upper camera.
A point in the coordinate of the lower camera is mapped to a line in the coordinate of the upper camera. When a keystroke is detected by the lower camera, the technique of initial finger location detection will search the corresponding line in the coordinate of the upper camera to find a potential finger location. The technique of refined finger location detection will further verify the keys situated around the potential finger location
and find out the key which the user really clicks. In the experiment, we compare the performance of four verification techniques, which are PCA+LDA, 2DLDA+LDA,SVM and GDA. Finally, the best verification technique is chosen to do verification in the refined detection of finger location. The overall performance of virtual keyboard is also shown in the experiment.
Subjects
虛擬鍵盤
投影鍵盤
主要軸分析
線性鑑別分析
二維線性鑑別分析
支撐向量法
廣義鑑別分析
Virtual keyboard
Projected keyboard
Principal component analysis
Linear discriminant analysis
2D discriminant analysis
Support vector machine
Generalized discriminant analysis
Type
thesis
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