Title：A high precision projector - camera calibration system and calibration method

Country：China

Patent No.：201410164584.6

Legal Status：Authorized

Inventor：Yiqiao Liao, Wei Song, Xiang Xie, Guolin Li, Yi Zheng, Zhihua Wang

Assignee：Tsinghua University

Address：Mailbox No. 82, Beijing 100084

Filing Date：2014-04-23

Issue Date：2017-04-12

The invention discloses a high-precision projector and camera calibration system and method. The high-precision projector and camera calibration method comprises the steps that a camera is calibrated through a camera calibration method, so that camera internal parameters are obtained; a pure white pattern is projected onto a calibration board, the pattern and a pattern of the calibration board are overlaid, and a calibration area image is captured; image distortion is corrected through the camera internal parameters, and then angle point coordinates in the calibration area image are extracted; a homography matrix between a camera image plane and a calibration board plane is estimated according to the correspondence of angle points; different specific chessboard patterns are projected onto the calibration board in sequence, the chessboard patterns and the pattern of the calibration board are overlaid respectively, and calibration area images are captured; differential processing and filtering processing are carried out on the calibration area images, and then angle point coordinates on the calibration board plane are extracted; an average value of the angle point coordinates is obtained, and then the angle points are mapped to the calibration board plane through the homography matrix; the above steps are repeatedly executed according to the obtaining situations of the angle points. A projector is calibrated through the camera calibration method. According to the high-precision projector and camera calibration system and method, precision of an optical three-dimensional measuring system is improved.

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