The invention provides an on-line measurement method and an on-line measurement
system for a section contour of a
continuous casting billet. The
system comprises a
checkerboard calibration plate, a
laser range finder, a camera and an
image server, the method comprises the following steps: carrying out offline calibration on a camera to obtain an internal parameter, an external parameter and a
distortion coefficient of the camera; when the
laser range finder detects that the end of the
continuous casting slab reaches the preset measurement datum line, a trigger
signal is sent to the camera; the camera receives the trigger
signal, collects a section image of the
continuous casting billet and sends the section image to the
image server; the
image server carries out
distortion removal
processing on the section image, all edge contour pixel points of the continuous
casting billet are extracted from the processed section image, world coordinates corresponding to the contour pixel points are calculated through
back projection, and a contour
point set of the continuous
casting billet in a world coordinate
system is obtained. By means of the technical scheme, the complete contour coordinates of the section of the
casting blank can be obtained on line only through a single industrial camera, cost and complexity are low, and the information dimension is greatly improved.