Embedded screen spot positioning device
Title：
Embedded screen spot positioning device
Application Number：
 200710062861
Application Date：
 2007/01/19
Announcement Date：
 2007/08/29
Pub. Date：
Publication Number：
 101025656
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G06F 3/01G06K 11/06H04N 5/74G03B 17/54G03B 7/095
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Shi Yuanchun, Yu Chun, Jiang Hao, Zhang Liang
Key Words：
 Embedded, screen spot, positioning device
Abstract：
 The invention relates to an automatic recognizing and locating technique for laser points on projection screen, characterized in that: under the coordination of a 650nm high transmission filter mounted in the lens of a camera, recognizing laser points in an image and calculating the actual coordinates of laser points relative to the screen through the screen coordinate information obtained in the automatic screen calibrating course, and controlling the size of lens aperture by aperture driving module to adapt to different requirements for the size of the lens aperture on the conditions of screen calibration and laser point locating, where a FPGA processor completes image processing and analysis, a MCU transmits laser point locating result through multi-channel RF receiver/transmitter to a host PC and besides, receives PC-sent image processor configuration file through the RF receiver/transmitter to implement wireless upgrading of configuration program. And the invention implements functions of automatic screen calibration, auto aperture control, auto laser point location and wireless loading of configuration program and has advantages of strong realtimeness, high reliability, simple and flexible to configure and easy to maintain.
Claim：
Priority：
PCT：
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  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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