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Re: Target acquisition with camera- color issues
As for values, what I can tell you is that the fields are quite bright and the black curtain also complicates things. When the camera faces the black curtain, it receives less light and increases the exposure time to compensate. Doing this only makes the glare on the targets worse.
Things that will help are listed in the document containing the recommended camera settings. The primary thing is to try lowering the Brightness setting on the camera. This will lower the exposure and keep the targets from being overexposed. Don't be concerned about setting it too low when things are as brightly lit as the event, but you may want to restore it when you return to the classroom or shop setting.
To set brightness in LV, the example was written with this as a parameter which you can change on they fly. Don't forget to make the current value default once you finish experimenting.
Another thing to consider is the effect that bright light has on color saturation. As luminance increases in an image saturation will naturally drop. So in an event where there are bright lights, you will likely see the saturation numbers of everything drop somewhat. When you threshold the image looking for the pretty saturated hues of the target fabric, you are supplying both upper and lower saturation thresholds. If the lower saturation thresholds are too high, you will get streaks and parts of the target image with glare not making it into the mask.
Greg McKaskle
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