Precise full-field distortion rectification and evaluation method for a digital projector |
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| Authors: | Zhangying Wang Miao Liu Shourui Yang Shujun Huang Xuefei Bai Xiaohong Liu Jigui Zhu Xiaoli Liu Zonghua Zhang |
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| Affiliation: | 1.School of Mechanical Engineering,Hebei University of Technology,Tianjin,People’s Republic of China;2.State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin,People’s Republic of China;3.Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen Key Laboratory of Micro-Nano Measuring and Imaging in Biomedical Optics,Shenzhen University,Shenzhen,People’s Republic of China |
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| Abstract: | Digital projectors have been widely used in many accuracy-sensitive fields. Although some calibration methods have been proposed to obtain the intrinsic parameters for a digital projector, especially the radial and tangential distortion, there are few studies on how to rectify the projected image to obtain an ideal projection pattern and further evaluate the results. In this paper, a precise full-field image rectification technique is proposed based on the principle of projector calibration. The pixel remapping and interpolation techniques are detailed step by step. All of the method’s steps maintain subpixel accuracy. Moreover, a full-field verification method is presented to evaluate the effectiveness of the projector distortion procedure using a full-field phase map. A full-field non-linear distortion distribution map can be generated to represent distortion characteristics of nearly all the pixels of a projector in a very intuitive way. The experimental results validate and show the effectiveness of the proposed full-field rectification technique and evaluation method. |
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