National Instruments IMAQTM - Manual (Page 85)

Chapter 5 Performing Machine Vision Tasks
© National Instruments Corporation 5-33 IMAQ Vision for Visual Basic User Manual
to True . With CWMachineVision.FindPattern , you can overlay the
search area and the result.
Use CWIMAQOverlay.Clear to clear any previous overlay information
from the image. Use CWIMAQVision.WriteImageAndVisionInfo
to save an image with its overlay information to a file. You can
read the information from the file into an image using the
CWIMAQVision.ReadImageAndVisionInfo .
Note As with calibration information, overlay information is removed from an image
when the image size or orientation changes.