Title：Method and System of Acquiring User Finger Parameters in Projection Touchpad
Country：China
Patent No.：201711135967.0
Legal Status：Authorized
Inventor：Sen Li, Xiang Xie, Guolin Li, Songping Mai, Zhihua Wang
Assignee：Graduate School at Shenzhen, Tsinghua University; Tsinghua University
Address：Tsinghua Campus, Xili University Town, Nanshan District, Shenzhen City 518055, Guangdong Province
Filing Date：2017-11-16
Issue Date：2022-06-17
Abstract：
The invention provides a method and system for obtaining the user's finger parameters in the projection touch panel, including: Taking the current image of the projection plane, calculating the difference image with the difference value between the overlook and contrast images of the current image, judging whether the difference image contains the finger wheel profile of the user, and if so, the difference image is extracted. The user's finger outlines, decodes the two-dimensional coordinates of each point on the profile of the user's finger, determines the main direction of the user's finger and the width of the finger, a. According to the main direction, the fingertip Pf and the axis of the plane are determined at the far end of the user's finger outline, and the N points on the axis of the plane are taken as the reference points to calculate the Pf in the difference image. The 3D coordinates of the N reference points and the 3D coordinates of Pi are calculated according to the 3D coordinates of Pf and N reference points. Based on the method of the invention, the problem of how to manipulate the cursor on the projection touchpad is solved.
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