Found the code for targeting. According to the comments lighting should have no effect on it. For you tech savvy people (isn't that everyone here?), download the
windriver updater, rename it to a .zip, and unzip it. In the folder go to vxworks-6.3\target\src\demo\2010ImageDemo. Target.cpp is the source code for the targeting system.
Looks like they just went with converting the color image into monochromatic and looking for the changes there. they even made detecting the circle an API call.
oh and indubitably you can find the LabVIEW update
here.