© Orbotech 2005
Symbion™ Programmer Guide
75
Draft - Confidential
OCR Parameters
The following parameters controlling the OCR Engine are available;
•
Expected Text
defines the text to be read from the OCR Inspection Area,
the text may be entered using wildcards (
*
?
)
Regardless of the text entered in
Expected Text
if the
Minimum Length
or
Maximum Length
conditions are set and
not met the Inspection will fail.
•
Type
describes the marking type, as
Black on White
,
White on Black
or
Laser Etched
The chosen
Type
determines the default lighting used initially
•
Filter
can be set to apply a filter to the processed image prior to reading.
Two
Filter
types are available,
Blur
and
Median
each may be applied with
a factor from
1
to
4
Filters can be used to improve contrast in the processed image.
•
Brightness Offset
will manipulate the processed image
When the offset is
0
the image is processed automatically. Setting an
offset can reduce noise in the image.
The offset may be both +ve and –ve
•
Orientation
determines the direction (relative to the component) in which
the text should be read.
Setting
default
the system reads the text from the component orientation.
•
Dust Size [mm]
defines the smallest object that may be read as text.
Setting
0
the system attempts to read all objects.
Use the ruler
to check the size of objects in the processed
image
•
Max Char Size [mm]
defines the largest object that may be read as text.
Setting
0
the system attempts to read all objects.
•
Min Font Aspect Ratio [%]
and
Max Font Aspect Ratio [%]
define rules
for the ‘shape’ of characters.
Setting
0
the system attempts to read all objects.
The Aspect Ratio is calculated as Width / Height
Summary of Contents for Symbion S36
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