ANPR
© Nedap AVI, P.O. Box 103, NL-7140 AC GROENLO Page 11 of 27
5.2.2 CAMERA OCR
This page configures the Frame Grabber Settings.
On the left side of the page 'live' video images are shown. The red rectangle on the image border represents the
search plate window. It is possible to set size and position of this window in Plate Reader page.
General
Grab Mode: Here it is possible to set the image grabbing mode and camera related settings. Three
image grabbing modes are available: AUTOIRIS, SINGLE-POINT, and MULTI-POINT.
Result position: In this section, it is possible to specify, inside the live image, the position of the OCR
reading results and the unit's work parameters. The allowed values are: TOP-LEFT,
TOP-RIGHT, BOTTOM-LEFT, BOTTOM-RIGHT and DISABLED.
Autoiris
Automatic grabbing mode. Using autoiris, images show better lighting uniformity during the whole day, while
using the Multi-Point mode image lighting varies more. It is advisable using the autoiris mode while using the
Multi-Point mode whenever autoiris can't provide for satisfying performance.
Max Shutter us: Maximum exposure time in microseconds. This value should be set based upon the
maximum vehicle speed. Too long an exposure time would produce blurred images
and result in lower reading performance. Maximum exposure time value should
therefore set to a low enough value so as not to get blurred images. During low light
hours, the higher the exposure time the higher chances are to get images where the
vehicle is visible.
Single-point
Gain: Indicates the gain of the vehicle signal.
Shutter us: Indicates the exposure time in microseconds.
Strobe us: Activation time of the infrared illuminator in microseconds.
Multi-point
In this section it is possible to set the parameters for the multi-point grabbing mode. This mode cyclically uses
the work points Gain0/Shutter0, Gain1/Shutter1, Gain2/Shutter2 and Gain3/Shutter3. Too light or too dark
images are automatically excluded from processing by the ANPR software.
Set values must be steady crescent. This means that Gain3 ≥ Gain2 ≥ Gain1 ≥ Gain0 and Shutter3 ≥ Shutter2 ≥
Shutter1 ≥ Shutter0. The web page does not allow setting values that do not comply with these requirements.
Gain0: Indicates the gain of the vehicle signal for work point 0.
Shutter0 us: Indicates the exposure time in microseconds for work point 0.
Gain1: Indicates the gain of the vehicle signal for work point 1.
Shutter1 us: Indicates the exposure time in microseconds for work point 1.
Gain2: Indicates the gain of the vehicle signal for work point 2.
Shutter2 us: Indicates the exposure time in microseconds for work point 2.
Gain3: Indicates the gain of the vehicle signal for work point 3.
Shutter3 us: Indicates the exposure time in microseconds for work point 3.
Function buttons
Start Live: Start live video displaying.
Stop Live: Stop live video displaying.
Apply: Confirm entered configuration values.
Reset: Cancel entered configuration values that not have already been confirmed with the
Apply-button.
Note: Image processing engine is stopped during live video displaying!
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