[Jared Russell]

The vertical green line is simply an alignment aid that is burned in to each image - it is not an indication that you have successfully detected the target. If the vision system is picking up the vision targets, you should see blue rectangles and dots indicating the outline and center of the targets, respectively.

Which images are you testing with? The supplied images should work with the code "as is". If you are using your own images, are you using a green LED ring? If you are using a different color LED ring, you will need to alter the color threshold values in the code. Note that regardless of LED ring color, adjusting the camera to have a very short exposure time (so that the images are quite dark) increases the SNR of the retroreflections, and makes tracking both more robust and much quicker.