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Calibrate tab
When you switch to the Calibrate tab the module enters calibration mode, which is used to set
reference values. When you subsequently draw a measurement line, those values will be used to
compute the line's real length. Switching to any other tab puts the module out of calibration mode.
To calibrate, start by selecting one of the 3 calibration methods available:
- Inter-pixel is the simplest method. It assumes that you know the exact distance between adjacent
pixels on the image. To calibrate, enter that distance under Calibrated Length. The current calibrated
length will appear as an overlay at the bottom of the image.
- Between 2 points is the standard method. This method requires you to left-click and drag the
calibration line's handles to make a line of known length on the image. Enter that length under
Calibrated Length. Note that if you subsequently redraw or remove the calibration line you will have
to adjust the Calibrated Length value accordingly. For the best accuracy, use a longer calibration line.
- Between 2 points (Horizontal & Vertical) is an advanced method. It is only used for cameras that
do not have square pixels, i.e. where the CCD's inter-cell distance is not the same horizontally and
vertically. The calibration procedure is the same as for the previous method, except that you have to
do it twice, once with a horizontal line and once with a vertical line. Both must be done for
measurements to be accurate.
When calibration is completed, switch to the Measure tab and do a couple of test measurement lines
to see if everything is correctly calibrated. If not, return to Calibrate and readjust the calibration.
StreamPix5 - Copyright Norpix Inc. (C) 2013 (136/187)