Laser & Optoelectronics Progress, Volume. 59, Issue 13, 1312003(2022)
Accurate Local Homography-Based Projector Calibration Method
In fringe projection profilometry, projector calibration is an important part of system calibration. Accurate projector calibration is key to ensuring the accuracy of three-dimensional shape measurements. The profilometry projector cannot capture the image directly. Thus, obtaining the correspondence between pixels and object points is difficult, which makes projector calibration complex with low precision. To address this problem, we analyzed the factors that influence projector calibration and presented a new projector calibration method based on local homography matrix. First, we conducted experiments to determine the optimum size of the local area. Then, we calculated the local homography matrix of the area where the center of the circle is located and completed the mapping of the projector's coordinates. Finally, we used the camera calibration method to calibrate the projector. Experimental results show that this method reduces the influence of center deviation and phase error on the calibration accuracy of the projector. Based on the idea of local linearization, the subpixel mapping of camera image coordinates to projector image coordinates is established, and the accuracy of projector calibration is improved.
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Lijun Sun, Dandan Zhang, Tianfei Chen, Zhiyuan Huang, Shi Li. Accurate Local Homography-Based Projector Calibration Method[J]. Laser & Optoelectronics Progress, 2022, 59(13): 1312003
Category: Instrumentation, Measurement and Metrology
Received: Aug. 9, 2021
Accepted: Aug. 23, 2021
Published Online: Jun. 9, 2022
The Author Email: Chen Tianfei (chen_tianfei@163.com)