EN
146
Software Module
11.14.3.5. Binarization
Goal
The characters are separated from the background with the help of the binarization
threshold. It must be determined which type of character is involved and which operating
mode needs to be used. Selection can be made between several binarization modes.
Characteristic
The following settings/results are available:
Contrast The mode of application is specified, i.e. dark characters on a light
background or light characters on a dark background.
Threshold value
mode
The following options are available:
Manual
The binarization threshold is set
manually by specifying the lower and
upper threshold values.
Calculation
The binarization threshold is calculated
automatically by the OCR algorithm.
Linear
This mode is used when a linear
brightness profile can be detected in
the image.
Non-linear
This mode is used when the image is
not homogeneously illuminated. In the
cease of non-linear calculation of the
binarization threshold, the image is
broken down into predetermined sec-
tions, and the best possible binarization
threshold is calculated for each.
Linear/non-linear
threshold value
splitting
This value specifies into how may parts the search region will be split
up in order to calculate the individual threshold values.
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