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�������պ����ѧѧ�� 2007, Vol. 33 Issue (12) :1444-1447    DOI:
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Automatic geometry alignment for muti-projector image display wall
Peng Junyi, Chen Huan, Dai Shuling*
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� A practical and scalable alignment automation system for muti-projector display wall was constructed based on the measurement of low-performance cameras. Taking the advantage of re-alignment theory the homography matrix was refined and used to achieve seamless alignment across different areas on the projection screen. The special pattern for feature extraction and the re-alignment idea furthest decreased the effect of the cameras- performances on the alignment precision. The system can automatically align the projectors under the conditions that there are overlapped view areas between adjacent projectors and cameras can observe them. It is shown in the experiments that the re-alignment method obviously shortens the calibration period and brings us sub-pixel alignment precision. The low-performance cameras, high efficient feature extraction method and sophisticated solution for homography make the cost of expanding the system low.
Keywords�� feature extraction   alignment   muti-projector display   projection screen   homography     
Received 2006-12-05;
About author: ����(1966-),��,�����ǹ���,������,pengjunyi@buaa.edu.cn.
����,�»�,������.��ͨ��ͶӰͼ��ļ����Զ�ƴ�Ӽ���[J]  �������պ����ѧѧ��, 2007,V33(12): 1444-1447
Peng Junyi, Chen Huan, Dai Shuling.Automatic geometry alignment for muti-projector image display wall[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(12): 1444-1447
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2007/V33/I12/1444
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