PDFlib Text Extraction Toolkit (TET) Manual

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Table 10.10 Page options for TET_open_page( ) and TET_process_page( ) option docstyle excludebox granularity includebox fontsizerange ignoreinvisibletext imageanalysis layoutanalysis description (Keyword) A hint which will be used by the layout detection engine to select various parameters. These parameters optimize layout detection for situations where the document belongs to one of the classes below. If the document is known to fall into one of these classes layout detection results can be improved significantly by supplying a suitable value for this option. This option activates advanced layout recognition (default: none): book Typical book business Business documents cad Technical or architectural drawings which are typically heavily fragmented fancy Fancy pages with complex layout forms Structured forms generic The most general document class without any further qualification. magazines Magazine articles none No specific document style is known and advanced layout recognition will be disabled. papers Newspaper science Scientific article searchengine The application is a search engine indexer or similar application, and mainly interested in retrieving the word list for the page as fast as possible. Table and page structure recognition are disabled. spacegrid List-oriented report (often generated on mainframe systems) where the visual layout is generated using space characters. Since many heuristics like shadow detection and sophisticated word boundary detection are not required for this class of documents text extraction can be accelerated with this option. (List of rectangles) Exclude the combined area of the specified rectangles from text extraction. Default: empty (List of two floats) Two numbers specifying the minimum and maximum font size of text. Text with a size outside of this interval will be ignored. The maximum can be specified with the keyword unlimited, which means that no upper limit will be active. Default: { 0 unlimited } (Keyword) The granularity of the text fragments returned by TET_get_text( ); all modes except glyph will enable the Wordfinder. See »Text granularity«, page 84, for more details (default: word). glyph word line page A fragment contains the result of mapping one glyph, but may contain more than one character (e.g. for ligatures). A fragment contains a word as determined by the Wordfinder. A fragment contains a line of text, or the closest approximation thereof. Word separators will be inserted between two consecutive words. A fragment contains the contents of a single page. Word, line, and zone separators will be inserted as appropriate. (Boolean) If true, text with rendering mode 3 (invisible) will be ignored. Default: false (since invisible text is mainly used for image+text PDFs containing scanned pages and the corresponding OCR text) (Option list) List of suboptions according to Table 10.13 for controlling high-level image processing. (List of rectangles) Restrict text extraction to the combined area of the specified rectangles. Default: the complete clipping area (Option list; not for granularity=glyph) List of suboptions according to Table 10.12 for controlling layout detection features. 170 Chapter 10: TET Library API Reference
Table 10.10 Page options for TET_open_page( ) and TET_process_page( ) option layouteffort layouthint skipengines structureanalysis topdown description (Keyword) Controls the quality/performance trade-off of layout recognition. Layout recognition can be improved by spending more effort, but this may slow down operation. The layout recognition effort can be controlled with the keywords none, low, medium, high, and extra. Default: low (Option list) Inform the layout recognition engine about the presence of certain page layout elements: subsummary (Keyword) Informs the engine about the presence of subsummaries (marginalia) and possibly also their position. Supported keywords (default: none): auto No subsummary detection left Try to detect subsummaries on the left side of the page. none Try to detect subsummaries automatically. right Try to detect subsummaries on the right side of the page. header (Boolean) If true, the engine tries to detect page headers (default: false). footer (Boolean) If true, the engine tries to detect page footers (default: false). (List of keywords) Skip some of the available parsers for the page contents. A skipped engine never returns any data for this page. Skipping an engine which is not required will improve performance for applications which don’t need the data delivered by this engine (default: all engines are active): text (Keyword) Skip the text extraction engine. image (Keyword) Skip the image extraction engine. (Option list; not for granularity=glyph) List of suboptions according to Table 10.14 for controlling page structure analysis. (Option list) Specify a coordinate system with the origin in the top left corner of the visible page, and y coordinates which increase downwards; otherwise the default coordinate system with the origin in the lower left corner will be used. Enabling topdown coordinates enables the same coordinate system which is displayed in Acrobat. Supported suboptions: input output (Boolean) If true, enable coordinates for the following items (default: false): page options includebox, excludebox (Boolean) If true, enable coordinates for the following items (default: false): TET_char_info: y, alpha, beta TET_image_info: y, alpha, beta TETML: Glyph/@y, Glyph/@alpha, Glyph/@beta, Box/@lly, Box/@ury, PlacedImage/@y, PlacedImage/@alpha, PlacedImage/@beta 10.8 Page Functions 171
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ABC Text Extraction Toolkit (TET) V
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Contents 0 First Steps with TET 7 0
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8.6 Restrictions and Caveats 121 9
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0.2 Applying the TET License Key Us
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Setting the license key with a TET
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CJK support. TET includes full supp
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The TET Plugin is a free extension
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new connector for the TIKA toolkit
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Table 2.1 TET command-line options
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2.2 Constructing TET Command Lines
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Extract images from file.pdf in a r
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3.2 C Binding TET is written in C w
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3.3 C++ Binding Note For applicatio
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3.4 COM Binding Installing the TET
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The following method of the String
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3.7 Objective-C Binding Although th
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3.8 Perl Binding The TET wrapper fo
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} catch (TETException $e) { print "
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3.11 REALbasic Binding Installing t
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oot :to => "home#demo" > Edit app/c
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tion occurs, the job log shows the
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Acrobat provides only garbage when
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BUILD SUCCESSFUL Total time: 2 seco
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4.3 TET Connector for the Solr Sear
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SQL> GRANT EXECUTE ON CTX_DOC TO HR
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4.5 TET PDF IFilter for Microsoft P
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4.6 TET Connector for the Apache TI
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4.7 TET Connector for MediaWiki Med
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5 Configuration 5.1 Extracting Cont
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5.2 Resource Configuration and File
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product manually, make sure to use
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5.3 Recommendations for common Scen
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Also to ensure text fidelity you ma
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6 Text Extraction 6.1 PDF Document
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How to display with Acrobat X: Tool
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6.2 Page and Text Geometry Default
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width (x, y) beta fontsize baseline
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* Query ascender and descender valu
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6.3 Chinese, Japanese, and Korean T
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Table 6.1 CJK compatibility decompo
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Since the PDF document may map pres
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Separator characters are inserted b
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this situation and recombines both
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Table 6.4 Document styles docstyle=
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7 Advanced Unicode Handling 7.1 Imp
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Composite characters and sequences.
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7.2.2 Filters for Granularity Word
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7.3 Unicode Postprocessing TET offe
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Default foldings. Except for granul
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Compatibility decomposition. Charac
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In contrast, the following option l
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Table 7.7 Unicode normalization for
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7.5 Unicode Mapping for Glyphs Whil
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Fig. 7.2 Sample font reports create
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glyphmapping {{fontname=Warnock* to
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8 Image Extraction 8.1 Image Extrac
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8.2 Image Merging and Filtering Ima
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8.3 Placed Images and Image Resourc
Page 119 and 120: 8.5 Geometry of Placed Images Using
Page 121: 8.6 Restrictions and Caveats Image
Page 124 and 125: Various elements and attributes in
Page 126 and 127: c h e n 126 Chapter 9: TET Markup
Page 128 and 129: tet --tetml wordplus file.pdf With
Page 130 and 131: Object ’objects[49]/Subtype’ do
Page 132 and 133: Table 9.3 TETML elements and attrib
Page 134 and 135: 9.4 Transforming TETML with XSLT Ve
Page 136 and 137: document containing the xml process
Page 138 and 139: [TheSansBold-Plain/13.98] 1 [TheSan
Page 141 and 142: 10 TET Library API Reference 10.1 O
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Page 145 and 146: Unicode sets. Unicode sets and can
Page 147 and 148: 10.4 Geometric Types Rectangle. A r
Page 149 and 150: Table 10.2 Global options for TET_s
Page 151 and 152: 10.6.2 Setup C TET *TET_new(void) C
Page 153 and 154: C++ int delete_pvf(wstring filename
Page 155 and 156: 10.6.4 Unicode Conversion Function
Page 157 and 158: 10.6.5 Exception Handling C++ wstri
Page 159 and 160: 10.6.6 Logging The logging feature
Page 161 and 162: 10.7 Document Functions C++ int ope
Page 163 and 164: Table 10.8 Document options for TET
Page 165 and 166: Table 10.8 Document options for TET
Page 167 and 168: Table 10.9 Suboptions for the glyph
Page 169: 10.8 Page Functions C++ int open_pa
Page 173 and 174: Table 10.11 Suboptions for the cont
Page 175 and 176: Table 10.12 Suboptions for the layo
Page 177 and 178: 10.9 Text and Metrics Retrieval Fun
Page 179 and 180: Bindings C and C++ language binding
Page 181 and 182: 10.10 Image Retrieval Functions C++
Page 183 and 184: C++ int write_image_file(int doc, i
Page 185 and 186: 10.11 TET Markup Language (TETML) F
Page 187 and 188: Java and .NET language bindings: th
Page 189 and 190: estricted pCOS mode if nocopy=false
Page 191: 10.12 pCOS Functions 191
Page 194 and 195: Image Retrieval Functions Function
Page 197 and 198: Index A annotations 71 API referenc
Page 199 and 200: TET command-line tool 17 TET connec
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