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

Pub. No.:    WO/2018/196303    International Application No.:    PCT/CN2017/107275
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Tue Oct 24 01:59:59 CEST 2017
IPC: G01B 11/00
G01B 11/24
Applicants: SHENZHEN UNIVERSITY
深圳大学
Inventors: PENG, Xiang
彭翔
ZHANG, Yaqin
张雅琴
LIU, Xiaoli
刘晓利
YANG, Yang
杨洋
CAI, Zewei
蔡泽伟
Title: PROJECTOR CALIBRATION METHOD AND APPARATUS BASED ON MULTI-DIRECTIONAL PROJECTION
Abstract:
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.