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|1. (WO2018196303) PROJECTOR CALIBRATION METHOD AND APPARATUS BASED ON MULTI-DIRECTIONAL PROJECTION|
|Title:||PROJECTOR CALIBRATION METHOD AND APPARATUS BASED ON MULTI-DIRECTIONAL PROJECTION|
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.