I've created a VI (with the help of Vision Assistant) that uses an "IMAQ Match Color Pattern" subVI. When I provide a single still image, the match is successful and the coordinates of the match are displayed as expected.I'm facing two problems though... 1) I can't seem to overlay/ highlight a successful match. When I connect the 'Bounding Box' output of "IMAQ Match Color Pattern" to the 'Line End Points' input of "IMAQ Overlay Multiple Lines", I get this error:"Error -1074395318 occurred at IMAQ Overlay LinesYou supplied an insufficient number of points to perform this operation." 2) When I modified the VI to extract still frames from a video (AVI file) and fed those frames to the subVI using a for-loop, no matches were made. I've played with the subVI's minimum match score without success. Is this a timing issue? I'm currently using 'wait' to slowdown iterations of the for-loop.Thanks in advance for your help.

Machine Vision

It should work with avi too. Try the pattern amtching in vision assistant if you really get a match first from the frames of avi.

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Are you doing any compression when creating the AVI file? I'd double check this, too.

Also, if you extract the images, save them to file, and then perform the color pattern matching on them, do you see the same performance?

Marti C
Applications Engineer
National Instruments
NI Medical

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