1. Select Video Stream. Then under preview select Open.
2. Click the "Show pixel Counter" box and set the width to 150 and height to 75.
To achieve maximum confidence in your plate hits you will want to position a car in the lane of traffic and zoom in and focus on the stationary plate. Then run the car down the lane of traffic a few times at different speeds. This will tell you if you need to zoom in or out. The goal is to have the plate matched up to the edges of the box.