National Instruments IMAQ Vision for LabWindows TM /CVI - Manual (Page 85)

Chapter 5 Performing Machine Vision Tasks
© National Instruments Corporation 5-33 IMAQ Vision for LabWindows/CVI User Manual
The following list contains the kinds of information you can overlay
with the previous functions except
imaqFindPattern() ,
imaqCountObjects() , and imaqFindTransformPattern() .
• The search area input into the function
• The search lines used for edge detection
• The edges detected along the search lines
• The result of the function
With imaqFindPattern() , imaqCountObjects() , and
imaqFindTransformPattern() , you can overlay the search area and
the result. Select the information you want to overlay by setting the element
that corresponds to the information type to
TRUE in the options input
parameter.
Use imaqClearOverlay() to clear any previous overlay information
from the image. Use imaqWriteVisionFile() to save an image with
its overlay information to a file. You can read the information from the
file into an image using
imaqReadVisionFile() .
Note As with calibration information, overlay information is removed from an image
when the image size or orientation changes.