That's a real bill blown up to 400 times actual size. The four people are employees of Matsumura Technology, the leading supplier of counterfeit detectors in the world.
They're checking blown up sections of counterfeit bills against the real deal to make their machines better. Their machines are the worlds best defense against the excellent quality counterfeits coming from North Korea & Russia.
They can check US notes, with 99.5% accuracy, at 0.7 seconds per bill. Other currency, including Euros, take 0.6 seconds per bill.