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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the problems of complexity and low accuracy in correcting the distorted image of ultra-short focus projector, the acquisition of projection attitude, the distortion region and the feature point of the optimal correction region were analyzed and studied, and a highprecision ultrashort focus projection distortion intelligent adjustment system was developed. Firstly, the principle of projection and the shape type of distorted image caused by attitude was studied, and the critical correction angle and correction scheme was obtained. Secondly, the attitude information of the projector was calculated for subsequent distortion area acquisition by using the ranging plane obtained by the spatial scatter fitting method. Finally, geometric relation of projection plane, digital micromirror device(DMD)and projected light, and optimal search method were combined to design the vertex information acquisition algorithm of the distortion region, the optimal correction projection region search algorithm and the vertex position information acquisition algorithm of the digital mirror, which could obtain four vertex information used to change the spatial light modulator matrix to realize the distortion correction, and the adjustment accuracy, adjustment time, image size and DMD utilization rate were analyzed and summarized by simulation and correction tests. The results indicate that the angle calibration deviation is less than 0.1° and the calibration time is less than 2s. Comparing with the intelligent calibration method based on camera, the calibration speed is increased by 3 times, and the adjustment system can meet the requirements of simple operation, high precision and fast response. The system can also be applied to the intelligent adjustment of distorted picture of medium telephoto projector.
Key words: ultrashort focus projector; distorted image; projection posture; correction accuracy; correction area; intelligent adjustment system
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