Projector calibration method and device for multi-directional projection
A calibration method and calibration device technology, applied in the field of optical measurement, can solve the problems of deviation between the three-dimensional world coordinates and the real value, system error, inaccurate feature point image extraction, etc., to achieve accurate feature point image extraction, eliminate system error, the effect of accurate calibration results
Active Publication Date: 2018-06-22
SHENZHEN UNIV
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[0005] The present invention provides a projector calibration method and device for multi-directional projection, aiming at solving the inaccurate feature point image extraction and the deviation between the three-dimensional world coordinates of the target feature point and the real value when the phase method is used for calibration. The problem of introducing systematic errors makes the calibration results more accurate
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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0050] The present invention provides a projector calibration method for multi-directional projection. The projector calibration method is applied to a projector calibration system, such as figure 1 As shown, the projector calibration system includes: a projector 1, a camera 2 and a target 3, the camera 2 is located above the target 3, and the optical axis of the camera 2 is perpendicular to the plane where the target 3 is located.
[0051] Specifically, before performing the calibration step, on the one hand, it is necessary to determine N suitable projection orientations around the target plane, ...
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Disclosed is a projector calibration method based on multi-directional projection, belonging to the technical field of optical measurement. The method comprises: step S1, using a projector (1) to project a pre-set calibration pattern onto a target plane in N pre-set specified directions around a target (3) in sequence, and collecting a target information graph using a camera (2) in each specified direction; step S2, processing the target information graph collected in each specified direction, obtaining an accurate phase value of a target feature point by means of calculation and then obtaining a sub-pixel coordinate, corresponding to the target feature point, in an image coordinate system of the projector (1); step S3, using the obtained sub-pixel coordinate in the image coordinate system of the projector (1), and a known three-dimensional world coordinate X of the target feature point to calibrate the projector (1) to acquire an initial calibration parameter; and step S4, using bundle adjustment to optimize the initial calibration parameter and the three-dimensional world coordinate X to obtain a final calibration parameter. By means of the calibration method, a final calibration result is more accurate.
Description
technical field [0001] The invention belongs to the technical field of optical measurement, and in particular relates to a calibration method and device for a multi-directional projection projector. Background technique [0002] The calibration technology of the 3D imaging system is a very critical step in 3D imaging. Among them, the projector calibration technology in 3D digital imaging is a method for estimating the fixed internal parameters of the projector in the 3D imaging system. The projector calibration technology is Three-dimensional imaging technology provides important three-dimensional imaging conditions, and better calibration techniques and methods can provide better imaging conditions for three-dimensional imaging. [0003] At present, 3D imaging systems can be divided into two categories, one is a 3D imaging system composed of a single camera and a single projector, and the other is a system composed of a dual camera and a single projector. The first type of...
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IPC IPC(8): G01B11/00G01B11/24
CPCG01B11/002G01B11/2433
Inventor 彭翔张雅琴刘晓利杨洋蔡泽伟
Owner SHENZHEN UNIV