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Chapter 5 Machine Vision
IMAQ Vision for LabWindows/CVI User Manual 5-6 ni.com
1. Define a template that represents the part of the object that you want
to use as a reference feature. For more information about defining a
template, see the Find Measurement Points section.
2. Define a rectangular search area in which you expect to find the
template.
3. Use the options parameter to select your options for finding the pattern
and the results that you want to overlay onto the image. When setting
the
Mode
element, select
IMAQ_MATCH_ROTATION_INVARIANT
when
you expect your template to appear rotated in the inspection images.
Otherwise, select
IMAQ_MATCH_SHIFT_INVARIANT
.Settheoptions
parameter to NULL to use the default options.
4. Choose the mode for the function. To build a coordinate transform for
the first time, set mode to
IMAQ_FIND_REFERENCE
.Toupdatethe
coordinate system in subsequent images, set mode to
IMAQ_UPDATE_TRANSFORM
.