The invention provides a line-scan
digital camera image-based high-precision calibration method, a measurement method and a
system, and relates to the field of automatic optical measurement of plates, and the calibration method comprises the following steps: constructing a hardware mechanism for line-scan
digital camera image calibration; acquiring a
linear array camera image based on a hardware mechanism; performing
distortion calibration on each line-scan
digital camera based on the line-scan digital camera images so as to obtain reference point X coordinates, X-axis average precision,
distortion correction coefficient arrays, working distances, grid numbers, Y longitudinal view offset pixels and Y longitudinal average precision corresponding to different intervals, wherein the reference point X coordinates, the X-axis average precision, the
distortion correction coefficient arrays, the working distances, the grid numbers, the Y longitudinal view offset pixels and the Y longitudinal average precision correspond to different intervals; and performing multi-
machine joint calibration on the plurality of line-scan digital cameras based on the line-scan digital camera images so as to obtain the proportion of the blind area width corresponding to different intervals to the
height difference of the calibration plane. Calibration data are obtained on the basis of high-precision calibration, automatic optical detection is carried out on the thickness of the plate in combination with the calibration data, and the problems that existing plate
size measurement is low in efficiency, poor in precision and poor in
repeatability are solved.