One camera, a blank sheet and the second ink. The street is not printed. Whatever moves on it is, and stays, and the sheet darkens where the city goes. Every ten minutes the sheet comes off the press, is stamped with the camera, the time and the count, and hangs below. Then a fresh sheet. Nothing is kept past the tab.
Keys 1–6 camera · S street · P pull now
Pulled this session
Nothing yet. The first sheet comes off in ten minutes, or when you pull it.
Method. The same tracker as the seventh camera reads twelve frames a second and
marks the pixels that differ from what the camera has learned to expect. Those pixels
are inked. The ink does not dry: each pass adds a little, so a lane crossed three
hundred times is dark and a corner crossed once is faint. The live movement sits on
top, a few pixels off register. A line is ruled across the sheet and every track that
crosses it is counted. The photograph is under the sheet the whole time; press
S to see it.
Source. New York State Department of Transportation traffic cameras, public
broadcast over HLS, 352 by 240, fifteen frames a second. The prints are made in the
browser and hang here until you leave.