ANPR LUMO | installation guide
Max Plate Angle (deg)
Should be used if there is a chance that the vehicles can appear rotated relative to the camera. This parameter allows
to adjust the maximum rotation under which LP are still accepted.
The best results are achieved when Max plate angle is between 5° and 20°.
Try to avoid rotated LPs by leveling out the camera during installation.
Min Plate confidence (%)
Minimum plate confidence refers to the minimum confidence level at which the camera will still accept readings as
valid. All readings with a lower confidence result will be ignored.
A typical value for Min Plate Confidence is 65 %. A higher value can assure that only good readings will be accepted, but
there is also an increased chance that correct readings are discarded.
Limit of low conf (%)
This parameter is used to set a limit below which a LP reading confidence is to be considered low, but still valid. The
lower confidence limit must be equal to/greater than the Min Plate Confidence.
The typical use of this parameter in conjunction with the Low Confidence Read action is to detect and store low quality
(= low confidence) readings for further analysis or retraining.
Maximum plates
Refers to the maximum number of plates that can be detected in a single image. Setting it to 0 means that an unlimited
number of plates can be detected.
Id the ANPR Lumo detects more than Maximum Plates license plates within the ROI, it chooses the license plates with
the highest confidences. E.g. if you set the parameter to 1, always the plate with the highest confidence is returned.
Minimum Contrast
This parameter defines the minimal contrast to differentiate foreground (characters) from the background (the license
plate itself).
Reducing the minimum contrast may help to detect LPs in difficult lighting situations at the cost of a longer reading
time.
It is recommended not to modify this parameter and use the default value provided by the camera.
Scale Width(%)/Scale Height(%)
Scaling means to resize an image in % relative to its original size, with separate scaling for width and height.
Scaling may help in situations where the camera sees license plates from the top or the side at a steep angle >40°. The
LP will be distorted in this case, and to adjust for that, it is possible to re-scale the opposite image dimension to
compensate for that.
Note that scaling will decrease the reading frame rate of the device.
Search inverted
Search inverted is an option that controls the way the ANPR Lumo engine searches for LP in terms of contrast of the
characters.
Disabled The camera will only search for plates with a bright background and dark characters. This is
the fastest mode and recommended if only this type of LP can occur.
Search The camera will only look for white-on-dark license plates if no dark-on-white license plates
have been detected. This option is a reasonable compromise between speed and detection
rate. It is still recommended to use it on only when necessary.
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