PDFlib TET
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The PDFlib Text Extraction Toolkit (TET) is a software for reliably extracting text information from any PDF file. It is available as a library/component and as a command-line tool. TET makes available the text contents of a PDF as Unicode strings, plus detailed glyph and font information. With TET you can retrieve the corresponding Unicode values for text in a PDF document, as well as its position on the page.

特征综述 About Feature

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PDFlib TET Features:
In addition to low-level text retrieval TET contains advanced content analysis algorithms for determining word boundaries, removing redundant duplicate text (such as shadows and artificial bold). Using the auxiliary pCOS interface you can retrieve arbitrary objects from the PDF, such as metadata, hypertext, etc.
  • With PDFlib TET you can:

    • extract text from PDF, e.g. to store it in a database
    • implement a search engine for processing PDF
    • convert the text content of PDF pages to XML for processing with other tools
    • process PDFs based on their contents

  • Supported PDF Input
    PDFlib TET supports all relevant flavors of PDF input:

    • all PDF versions up to PDF 1.6 (Acrobat 7)
    • all font and encoding types: base 14 fonts, TrueType, PostScript, OpenType, CID fonts encrypted PDF with 40- and 128-bit encryption (appropriate permission settings or password required)

  • Unicode
    Although text in PDF is usually not encoded in Unicode, PDFlib TET will normalize the text from a PDF document to Unicode:

    • TET converts all text contents to Unicode. In C the text will be returned in the UTF-8 or UTF-16 formats, and as native Unicode strings in all other language bindings.
    • Ligatures and other multi-character glyphs will be decomposed into a sequence of their constituent Unicode characters.
    • Vendor-specific Unicode assignments (Private Use Area, PUA) are identified, and mapped to characters in the common Unicode area if possible.
    • Glyphs without appropriate Unicode mappings are identified as such, and are mapped to a configurable replacement character.

  • Full CJK Support
    TET includes full support for extracting Chinese, Japanese, and Korean text. All predefined CJK CMaps (encodings) are recognized; horizontal and vertical writing modes are supported.
  • Content Analysis and Word Identification
    TET can be used to retrieve low-level glyph information, but also includes advanced algorithms for content analysis:

    • Detect word boundaries to retrieve words instead of characters.
    • Recombine the parts of hyphenated words.
    • Remove duplicate instances of text, e.g. shadow and artificial bold text.
    • Recombine paragraphs into reading order.
    • Reorder text which is scattered over the page.
    • Reconstruct lines of text.

  • Geometry
    TET provides precise metrics for the text, such as the position on the page, glyph widths, text direction. Specific areas on the page can be excluded or included in the text extraction, e.g. to ignore headers and footers or margins.
  • pCOS Interface for simple Access to PDF Objects
    TET includes the pCOS (PDFlib Comprehensive Object System) interface for retrieving arbitrary PDF objects. With pCOS you can retrieve PDF metadata, hypertext, or any other information outside the actual page descriptions with a simple query interface without the need for low-level programming.
  • Programming and Performance
    TET has been developed with portability, performance, and robustness in mind. TET is thread-safe for deployment in multi-threaded server applications. The core library is written in highly optimized C code for maximum performance and minimum overhead. Additional language bindings are available for COM, C, C++, Java, and .NET.
  • TET Command-Line Tool and TET Library
    TET is available as a programming library (component) for various development environments, and as a command-line tool for batch operations. Both offer the same base functionality, but are suitable for different deployment tasks. Here are some guidelines for choosing among both TET flavors:

    • The TET programming library can be used for integration into your desktop or server application. Examples for using the library with all supported language bindings are included in the TET package.
    • The TET command-line tool is suited for batch processing PDF documents. It doesn’t require any programming, but offers command-line options which can be used to integrate it into complex workflows. The TET command-line tool can be used to convert PDF page content to an XML document with Unicode text, with or without character metrics.

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