Milestone LPR 1.0 Bedienungsanleitung PDF herunterladen (Seite 34)

Milestone XProtect

LPR 1.0

Administrator's Manual

www.milestonesys.com

About LPR cameras

o Vehicle speed in km/h: Shutter time in seconds = 1 second / (11 × max vehicle speed in

kilometers per hour)

o Vehicle speed in mph: Shutter time in seconds = 1 second / (18 × max vehicle speed in

miles per hour)

where / denotes "divided by" and × denotes "multiplied by."

The following table provides guidelines for recommended camera shutter speeds at different vehicle

speeds:

Shutter time

in seconds

Max. vehicle

speed in

kilometers

per hour

Max. vehicle

speed

in miles per hour

1/50

1/100

1/200

1/250

1/500

1/750

1/1000

1/1500

136

1/2000

181

111

1/3000

272

166

1/4000

363

222

Physical environment

When mounting and using cameras for LPR, note the following environmental factors:

 Much light: Too much light in the environment can lead to overexposure or smear.

o Overexposure is when images are exposed to too much light, resulting a in a burnt-out

and overly white appearance. To avoid overexposure it is recommended that you use a

camera with a high dynamic range and/or use an auto-iris lens. Iris is the adjustable

opening (a.k.a. aperture) used for controlling the amount of light coming through a lens. Iris

thus has a significant effect on the exposure of images.

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