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561
Image Enhancement
Using Advanced
Line Removal
Line removal settings removes horizontal and/or vertical lines from
an image. Removing lines increases the accuracy of an OCR process.
AppXtender automatically detects and removes horizontal or vertical
lines – even the most degraded lines (under the Maximum Line Gap
parameter). With the Advanced Character Repair feature, the
accuracy of OCR improves greatly with difficult documents, such as
typed forms and those with underlined words. You can activate
horizontal line management separately from vertical line settings
with independent parameters. Other than orientation, these features
are identical.
Note: If line removal removes large text, you have several options. You can
estimate the thickness of the horizontal segments of the largest text characters
in your image, and set maximum line thickness to some value lower than that
thickness. Another option is to set horizontal minimum line values to larger
than the length of the longest horizontal segments of the largest text
characters. Conversely, set vertical line management values higher than the
longest vertical segment.
To perform advanced line removal on an image:
1. In AppXtender, display the document page that you want to
enhance.
2. From the Page menu, select Enhance Image. The Image
Enhancement dialog box appears. The example image in the
following figure has a thick line along the right side that needs to
be removed.