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A dramatic close-up of Lady Liberty’s frozen gaze fills one of three flat-screen computer monitors mounted on a console. Hundreds of sightseers below are oblivious to the fact that a helicopter is peering down on them from a mile and a half away.

“They don’t even know we’re here,” said crew chief John Diaz, speaking into a headset over the din of the aircraft’s engine.

The helicopter’s unmarked paint job belies what’s inside: an arsenal of sophisticated surveillance and tracking equipment powerful enough to read license plates — or scan pedestrians’ faces — from high above the nation’s largest metropolis.

Police say the chopper’s sweeps of landmarks and other potential targets are invaluable in helping guard against another terrorist attack, providing a see-but-avoid-being-seen advantage against bad guys.

“It looks like just another helicopter in the sky,” said Assistant Police Chief Charles Kammerdener, who oversees the department’s aviation unit.

Police Commissioner Raymond Kelly has said that no other U.S. law enforcement agency “has anything that comes close” to the surveillance chopper, which was designed by engineers at Bell Helicopter and computer technicians based on NYPD specifications.

The chopper is named simply “23” — for the number of police officers killed in the Sept. 11, 2001, attacks.

The $10 million helicopter is just part of the department’s efforts to adopt cutting-edge technology for its counterterrorism operations.

The NYPD also plans to spend tens of millions of dollars strengthening security in the lower Manhattan business district with a network of closed-circuit television cameras and license-plate readers posted at bridges, tunnels and other entry points.

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Police insist that law-abiding New Yorkers have nothing to fear.

“Obviously, we’re not looking into apartments,” Diaz said during a recent flight. “We don’t invade the privacy of individuals. We only want to observe anything that’s going on in public.”

The helicopter’s powers of observation come from a high-powered robotic camera mounted on a turret projecting from its nose like a periscope. The camera has infrared night-vision capabilities and a satellite navigation system that allows police to automatically zoom in on a location by typing in the address on a computer keyboard.

The surveillance system can beam live footage to police command centers or even to wireless hand-held devices.

“The commander on the ground can see what we’re seeing,” Diaz said.

On this flight, the helicopter used the camera to look for signs of trouble at several key transportation sites: the decks of Staten Island ferry terminal, the stanchions of the Verrazzano-Narrows Bridge, the giant air vents feeding the Lincoln Tunnel. All of them passed inspection.