and then move the left side of calibration bar forward about 300mm.
Make sure the two targets on the calibration bar are vertical to the
ground, and prepare to calibrate.
Click next step to begin second step calibration.
If the gray value of targets out of standard range, operator can change
the gray value of targets through adjust exposure time!!
Click "begin to calibrate" button, the indication "calculating camera
exposure time, please don't block targets" appears on the screen.
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