High-precision projector and camera calibration system and method

Abstract

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.

Description

technical field [0001] The invention relates to a projector-camera calibration system and calibration method, in particular to a high-precision projector-camera calibration system and calibration method, belonging to the technical fields of image processing and computer vision detection. Background technique [0002] The projector-camera system is widely used in the fields of three-dimensional measurement, augmented reality and human-computer interaction. With the development of the times, people have higher and higher requirements for the accuracy of three-dimensional measurement and human-computer interaction, and accurate calibration is the key The biggest premise for the system to achieve high precision, but the existing solutions have not achieved the desired effect. On the one hand, although some existing methods have achieved relatively accurate calibration results (the root mean square of the reprojection error is 0.11 pixels), they use expensive high-precision equip...

AI Technical Summary

Problems solved by technology

[0005] 1. The cost of high-precision calibration is high, and the simple calibration method of the easy-to-operate instrument cannot achieve satisfactory accuracy;

[0006] 2. The processing of the corner point extraction is not good enough, the error is not compensated or the noise is not filtered, and it is difficult to obtain an accurate correspondence;

[0007] 3. It is not easy to deal with the mutual interference between the printed image and the projected image, requiring the user to perform additional operations

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