The invention belongs to the technical field of measurement, and relates to an improvement to a calibration method of
structured light parameters in 3D vision measurement of
structured light. The invention provides a calibration method of the
structured light parameters based on a one-dimensional target. After a sensor is arranged, a camera of the sensor takes a plurality of images of the one-dimensional target in free non-
parallel motion; a
vanishing point of a characteristic line on the target is obtained by one-dimensional projective transformation, and a
direction vector of the characteristic line under a camera coordinate
system is determined by the one-dimensional projective transformation and a camera projection center; camera ordinates of a reference point on the characteristic line is computed according to the length constraint among characteristic points and the direction constraint of the characteristic line to obtain an equation of the characteristic line under the camera coordinate
system; the camera ordinates of a
control point on a plurality of non-colinear optical strips are obtained by the projective transformation and the equation of the characteristic line, and then the
control point is fitted to obtain parameters of the structured light. In the method, high-cost auxiliary adjustment equipment is unnecessary; the method has high calibration precision and simple process, and can meet the
field calibration need for the 3D vision measurement of the large-sized structured light.