The Posm Measurement Utility allows for measurements to be made based off of a known distance. This is accomplished by using two lasers in parallel. The distance between the lasers is known ahead of time. By calibrating the screen, Posm will count the pixels of drawn line and give an accurate distance measurement of that line. For the most accurate measurement, zoom in as close
as possible to the defect while keeping the laser lines in view of the camera. The more pixels that are used in the measurement, the more accurately Posm can measure.
After enabling the Posm Measurement Utility, set the “Enter Length of Targets” box with the distance between the laser dots or lines. If using imperial units enter this in inches if using metric use millimeters.
The measurement utility must be calibrated each time a measurement is taken. To calibrate the measurement utility right click on the screen and drag a blue line between the laser points. This will let Posm know how many pixels per inch or mm there are on screen. Anytime the camera is moved or zoomed the calibration must be redone!
Make a left click on the video screen then drag the mouse to create a red line. As the line grows larger the “Calibrated Length” value will get larger. Letting go of the mouse will copy the value to the field that was setup in preferences. That field can then be setup to display on the overlay if necessary. This broken joint has a 1.72 inch distance between the joint and broken concrete.