how to get length of image of camera

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A couple issues:

1) you would have to have an image that is a set distance from the camera, and then calibrate it.  DAQFactory can only really figure out the distance in pixels, and you'd have to convert that to actual distance based on the actual image.

2) if you are using the browser control for your image, you aren't going to be able to get any mouse information if the mouse is over the control because the browser captures it all.  

#1 is pretty easy to solve.  Just put a tape measure in the image at the same distance from the camera and calibrate.  #2 requires some creative workaround.  I would consider using vertical or horizontal lines that go under the image and then use the keyboard to tweak them.  Then you can easily calculate the distance using the coordinates of those lines.

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