Belvie, if you are interested in identifying money and other small objects, you may find this test to be useful: Camera Test: PPF Needed For IDs, Text, Money
Here's our key findings:
And here is an example shot of a dollar bill:
Notice, one thing to be careful about is the tendency for super high resolution cameras to have lighting / coloration problems.
That said, going from VGA to a high end 1080p camera could make a huge difference in such a scenario. Thanks for sharing! Let us know if you have feedback or questions.
Belvie, I think there may be a slight problem with both these numbers, though they are both pretty close.
I may be wrong, but right or wrong before presenting them, I would want to have a ready explanation for why they are not 64ppf and 192ppf, in case someone asks, because:
640 pixels width / 10 feet width at target = 64 pixels per foot
1920 pixels width / 10 feet width at target = 192 pixels per foot
I wouldn't mention it except that the math in this case is too easy and there is always some smart-ass in every meeting. It doesn't change your argument much either way, so just a heads up.