2N SELEA iZero, User Manual

Page: 32 / 51

32 / 51
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Processing area
It gives the possibility of isolating those parts of
the video recording that could interfere with the
correct identification of the number plates.
Some examples: screening the lane opposite the
capture lane, to avoid the reading of unwanted
number plates, removing rest areas from the
field of view, preventing the algorithm from
continuously searching for number plates from
advertising signs or regular patterns such as
fences or pavements, etc...
Move the mouse pointer on the green squares at
the corners of the display area and drag them to
the desired point.
The area outside the polygon will not be
considered in the
OCR
video analysis.
Control of unread number plates
With the function enabled, when the number plate of a transiting vehicle is read in full, the corresponding image is created and
forwarded through FTP (if the function is active).
If the number plate is only partially read, the
image is still created and sent through FTP, to
make sure that the vehicle transit record is not
lost.
A Enable/disable function.
B Live-view area where to draw the masks.
C
Drop-down menu for the selection of the
mask
D
Modifiable parameters
E “Delete area” button, to be used to delete
a designated area.
F "Show information" button brings up
real-time feedback that helps the user set the motion detection parameters
G “Apply settings”
button, to be pressed after setting the masks
In order to create an area, this must be drawn by clicking and holding down the mouse button on the live window of this
setting.
Motion detection is determined by the point by point comparison of images acquired after.
It is possible to adjust some parameters in order to define when the motion detected must be indicated as
“event”
or
overlooked.
Sensitivity: it indicates the colour percentage variation to which each pixel must be subjected to over time in order to be
considered different. A high value allows to overlook small changes due, for example, to environmental brightness
variations (clouds, rain, sunset...), or simply to digital optical sensor noise. If the value is set too high, the capability
of detecting the movement of objects with low levels of contrast in relation to the background will be reduced.
Percentage: it indicates the percentage number of points of a sensitive area that must vary in order for motion to
be notified. It determines the sizes of the framed objects for which motion is notified. Value typically
included between 15% and 40%.
Time window:
it indicates the duration (in seconds) of the time window considered by the motion detection algorithm.
The higher the value, the higher the capability of detecting small movements within the frame. However,
there will also be a higher level of exposure to false detections due to natural image brightness variations
over time, particularly if the other two parameters are adjusted in a sensitive manner.