User Manual

Table Of Contents
192
Repeat Recognition: Repeat recognition until the number of seconds specified in
Time out. You can also set the PC LPR to Continue recognizing until a
registered vehicle is recognized.
7. Adjust the Recognition Region Setup for each camera if needed: Only license plates
inside the area drawn will be recognized.
8. Use the Barrier Control drop-down list to select an output device. The output device will
be triggered when the detected license plate matches a registered license plate according
to the Matching Mode set in step 5.
9. Select Do not record unrecognized results to omit unrecognized results from LPR log.
10. Under Trigger output by LPR event, you can click the field under Value to select an
output device to trigger when the LPR event occurs.
11. Under Recognition Engine, adjust the settings below to improve recognition accuracy.
Recognition loop number: Repeat recognition for the number of times specified.
Max. / Min. characters: Set the maximum or minimum number of characters on
the license plate to activate the recognition process. If the number of characters
exceeds the maximum or is under the minimum, the system will not start the
recognition.
Max. / Min. height of characters: You can set the maximum and minimum height
of characters on the license plate in pixels to activate the recognition process.
Enable rotation detection: License plates tilted horizontally can be detected.
Enable fast rotation detection: This option can increase the recognition speed by
10 % but decrease the accuracy by 3%.
Max. / Min. rotation detection angle: Set the maximum and minimum tilt angle to
be allowed to activate the recognition process.
Enable Slant Detection: License plates tilted vertically can be detected.
Max. / Min. slant detection angle: Set the maximum and minimum tilt angle to
activate the recognition process.
Detect 2 line license plate: Recognize two rows of characters on license plates.
Note this option is only available on the engine version of V5000 or later.
Detection number of license plates: Set the maximum number of plates to be
recognized simultaneously.
Default plate background color: Select Light to only recognize plates with white
characters on dark background or select Dark to only recognize plates with dark
characters on white background. This function is only supported when Global or
China is selected for Country.