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specify ROI of the image acquired continuously from webcam

Hello,

How do we specify the ROI for the images that is continuously being acquired using webcam?

It goes into an infinite loop where i need to specify the ROI every time whenever a new image is acquired.

 

I want to acquire eye images using webcam and determine the position of the eye ball.

 

 

I want to specify the ROI the first time and then labview must detect the ROI by itself for the continuously acquired images.

how do i implement this? Please help me out. This is for my final year project.

 

Where do i put the ROI determination block in the VI specified below?

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