Measurement
XL Vu™ VideoProbe
®
101
StereoProbe Measurement
Stereo measurements require the use of StereoProbe measurement
tips, which capture stereoscopic images of a target — two pictures of the
same target from two different angles. To measure the target, the XL Vu
processor uses triangulation based on these two side-by-side images.
Stereo measurements can be taken on a frozen image or on a recalled
image that was saved in measurement mode.
Positioning the Probe Tip for Maximum Accuracy
Before freezing a stereo measurement image, position the probe tip to
meet these criteria:
Visibility: The item to be measured is fully visible in the left and right
images.
Tip-to-target proximity: The probe is positioned as close to the target as
possible while keeping it in focus.
Vertical orientation: If measuring distance between lines or across a
circle, the image is oriented so that cursors can be placed at the left and
right edges of the item to be measured — not at top, bottom, or diagonal
points. The system needs differentiated details to the left and right of
each cursor to accurately place the matching cursors on the right image.
Minimal glare: Glare is minimized by adjusting the viewing angle and the
image brightness in the areas where cursors will be placed. Small glare
speckles do not present a problem, but larger glare areas may appear in
different positions on the two sides causing false matches.
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