How does the people counter work?

It scans the photo for human figures using a pedestrian-detection model and draws a box around each person it finds, then reports the total. It's useful for estimating attendance at events, classroom or meeting headcounts, and crowd-density checks from a single picture.

Does it work on large, dense crowds?

It works best on small-to-moderate gatherings where people are reasonably visible and not heavily overlapping. In very dense crowds where bodies merge together, the count becomes an estimate — a clearer, higher-up photo improves accuracy.