GE XL VU - Comparison Measurement

100 XL Go+™ VideoProbe
®
Measurement
Comparison Measurement
Comparison measurements are to be taken when an item in the image
has a known dimension and that item’s dimension is used as a reference
to measure other items.
Measurement
Type
Advantages Disadvantages
Stereo Over comparison
measurements:
• More accurate
• No known reference
is needed
• Measure depth
• Surface does
not need to be
perpendicular to the
prove view.
• The surface does
not need to be
perpendicular to the
probe view.
The system may be
unable to position
matching cursors
accurately with any of
these conditions in the
measurement area:
• Insufcient detail
• Repeating patterns
• Glare
• Smooth, straight lines
to measure along
In some cases, the
problem can be eliminated
by repositioning the probe
tip and adjusting the
brightness. Otherwise,
try shadow measurement
Comparison • Use standard optical
tip
• Measure with tip
further away
• Measure large objects
• Check the
approximate size of
many items quickly
• Less accurate than
shadow or stereo
measurement
• Known references
may not be present
and may be difcult
to deliver to the
measurement site
• Measurement surface
must be nearly
perpendicular to
the probe view for
accurate results