Improving the quality
This page contains practical advices on choosing the best
scanning and OCR settings to maximize the recognition results.
Working with the paper documents
Recognition quality greatly depends on the quality of the source
image. When you want to recognize paper documents the first step is
scanning (see Using a scanner from
Getting an image page). Before
scanning you can check the print quality of your paper
document. If the document contains: noise (i.e. random black dots
or speckles), blurred and uneven letters or skewed lines then this
document can be determined as poor-quality and may require specific
For better recognition results on poor-quality paper documents
scanning in grayscale at 300 DPI is recommended.
Working with image files
When you work with image files for best results you can manually
edit selected regions, specify new regions, delete regions and/or
change region types.
The recognition process is applied only on all of the regions
for given image. You have a full control on regions. So
manipulating regions you can control the recognition process too.
For example if a picture region is marked as text during automatic
analysis, you can convert the region type to picture region or if
some text is not detected as a part of text region you can use the
Draw Text Region tool from Image View panel to draw a text region around
the text. You are free to resize or delete existing regions and/or
define new ones.
If the page orientation is not standard (for example the text is
upside-down) the rotation buttons on Image
View panel can be used.
Working with digital photographic images
In some cases you have a paper document but don't have a
scanner. In such situations you can take a photo of your document
and use this photographic image for recognition.
For best results in these situations:
- Make sure that the paper fits entirely within the frame that
there are no dark areas or shadows on it.
- Position the camera parallel to the plane of the document so
that the lens looks to the center of the page being
The minimum required digital camera specifications are:
- 2-megapixel sensor (5-megapixel or above is recommended).
- Variable focus lens (Usually cell phones and hand-held devices
use fixed-focus cameras. The images produced with these cameras are
not suitable for recognition).
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