Segmentation of heterogeneous document images : an ... - Tel

Figure 2.4: Part of a document in our corpus that contain large gaps between words.
tel-00912566, version 1 - 2 Dec 2013
Figure 2.5: Part of a document in our corpus that shows closely situated text lines.
5 or more text lines.
• Large gaps between words may lead to over-segmentation of text lines
and often cause fragments in text lines. Figure 2.4 shows an example of
large gaps between words.
• Closely situated text lines can become a challenge when the distance
between two components from a single text line is larger than the distance
between two components from different text lines. Text lines in Figure 2.5
are so close that distance-based methods such as minimum spanning tree,
fail to produce correct results.
• Highly curved text lines and calligraphy can be found in some freestyle
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