You can perform a distance measurement by using the Meaure Distance Tool located on the Measurement Toolbar. Select the image you would like to perform the measurement on by loading an image into the Image Viewer, or grab a live image with your camera.
Select
the Measure Distance Tool and then pick a point on your image. Click
another point on your image and the distance measurement between the
two points will be generated. There are a variety of measuring
tools available on the Measurement Toolbar including: fitting and
defining geometry, measuring distance between geometries, measuring
angles, cell counting and more. See the Help files under
Measurement Toolbar for
detailed instructions.
You
can also perform a distance measurement by using the Distance Tool
located on the Metrology Palette. Select the Distance Tool and
drag 'n' drop it onto the image viewer. An arrow will
appear with a numeric value. Grab either of the end points and
move them to the location you want to measure. There are
advanced features available with this tool. You can access them
by right-clicking anywhere along the arrow or on the end points. See
the Distance Help files
for more information.