The "Virtual Inductive Loop"
Porta Saragozza, Bologna - Italy

This is a vehicle counter based on the inductive wire loops principle . This transductor is emulated by a machine-vision algorithm which also counts the vehicles. The bottom-left side number is the progressive vehicle counter. Different colours in the displayed f(t) means different vehicles.

There are two different ways to take count of vehicles stops and standing under a VIL: "derivative" and "absolute". As shown the count is double in the derivative case:

(both) Porta Saragozza, Bologna - Italy
The central lane vehicle is counted twice in the left sequence and single in the right sequence.

Last update December, 11th 1998

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