IDEC DATAVS1 Series - Manual (Page 66)

Instruction Manual SVS1 Series
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To modify the position of the ROI, move to the Move ROI icon and then press SET. It is now
possible to move the ROI using the ARROW buttons. Once you have achieved the desired
position, press the TEACH button to return to the Setup menu. If you wish to modify the ROI
size, select the Resize ROI from the Setup menu (using the SET button again). It is now possible
to increase or decrease the ROI size using the ARROW buttons.
• Parameters:
Expected
Threshold used to assess the result. This indicates to what extent the detected string in the ROI
must match the sample string in order to be considered as valid (100% perfect match, 0% ... ).
Pinning
This allows to specify the pinning level of the characters to read. This parameter is very important
since, if properly set, allows to verify also strongly pinned characters.
• Img Contrast
This identifies the contrast between the writing and the background. This parameter affects the
binarization (
) of the image. It does not affect the result if the binarization is set on manual.
• Font size
It allows the user to define the minimum dimension of the characters that have to be verified. So it
is possible to exclude from the verification not interesting small characters.
• Threshold type
It specifies the binarization ( ) criterion for the character detection. It can be set on automatic or
manual.
• Manual threshold
This allows to specify the greylevel that has to be used in order to binarize ( ) the image. It can
assume values from 0 to 255. It does not affect the result of the algorithm if the binarization has
been set on automatic.
• Light type
It defines the lighting uniformity within the field of view. It affects the calculation of the best
binarization (
) threshold only if the threshold type is automatic.
• Result
If the string read by the sensor is identical to the reference string, the control gives a positive
result. On the contrary, the result will be negative.