You'll have to use IMAQ vision, an addon package that brings LabVIEW a series of tools for image analysis.
There are a number of examples/solutions. Some deal already with particle counting.
Although your question is rather vague, I suppose you want to get more info tahn the mere particle number (shape, color). That's definitely possible with LabVIEW, but will require a significant investment.
There is a forum dedicated to
Machine Vision where you'll get all the required help.
Chilly Charly (aka CC)
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