auto extracting a ROI

[TheSpecialist]

I am trying to test custom LCD displays using vision.  I can not find one easy way to perform some basic testing (contrast ratio, ghost images, missing segments...).  I am trying to use OCR to read back the LCD text.  The problem I am having is the LCD edge and plastic housing edge are very close.  If I manually set a ROI it sometimes catches the plastic edge of the housing and the software thinks its an unrecognized character.  How can I use edge detection to determine the top/bottom, left/right edges of the LCD and extract it as an ROI automatically?

[Maclean]

Hi,

Thanks for posting to the NI forums!  There are many VIs that convert a shape to an ROI.  You can use the points you find from the edge detection to create a rectangle, then convert it to an ROI using the rectangle to ROI VI.

Regards,