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Towards High Quality Text Stream Extraction from PDF Technical Background to the ACL 2012 Contributed Task

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Figure

Figure 2: Select challenges to whitespace covering ap-proach: stray whitespace inbetween groups of text (top);inter- vs
Figure 3: Select challenges to column identification: textelements protruding into the margin (top) and gaps inwhitespace rectangle coverage (often owed to processingbounds imposed for premium performance).
Figure 4: Examples of font-related challenges (before and after correction) and word segmentation.

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