Projector calibration method and device for multi-directional projection

Abstract

The invention is applicable to the technical field of optical measurement and provides a projector calibration method for multi-directional projection, which comprises: step S1, using a projector to sequentially project calibration patterns preset at N assigned positions preset around a target to a target plane, and collecting a target information map by using a camera at each assigned position; step S2, processing the target information map collected at each assigned position, calculating an accurate phase value of a target feature point, and further obtaining sub-pixel coordinates in a projector image coordinate system corresponding to the target feature point; step S3, calibrating the projector by using the sub-pixel coordinates in the projector image coordinate system and a three-dimensional world coordinate X of the known target feature point to obtain initial calibration parameters; and step S4, using a bundle adjustment method to optimize the initial calibration parameters and the three-dimensional world coordinate X to obtain final calibration parameters. The calibration method provided by the invention makes the final calibration results 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...

AI Technical Summary

Problems solved by technology

[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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