can draw more than 1 virtual line as ROI in an image display??

[wuliao23]

may i know is that possible to input more than 1 virtual line as ROI at the image display??
thanx for helping me...

[10Degree]

wuliao23,

You can draw multiple ROI's on your image if you hold the CTRL key down.  (Show the ROI tools.  Rt-click the image, select Visible Items...ROI Tools and make them visible.)  You can also show/hide specific tools on the ROI pallet, right click the pallet and select Visible Items...ROI Tool Button Visibility.

-cb

[wuliao23]

yes...
thank you...
i have a new question..
now i will draw 2 virtual lines on a image-- virtual line "A" and virtual line "B"
may i know that is that possible to specified the ROI for virtual line "A" and virtual line "B" differently??
because i need to do the edge detection...
then i need to specified is this the edge detected by virtual line "A" or virtual line "B"..
is that possible to do so by drawing 2 virtual lines on a image??

[10Degree]

wuliao23,

Take a look at "Edge Detection Example.vi", I think it does a lot of the things you are trying to do.  You can use a property node linked to your image to iterate through the ROI's drawn on your image and find edges for each.

-cb