502 lines
20 KiB
HTML
502 lines
20 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<html>
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<head>
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<link rel="stylesheet" type="text/css" href="style.css">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<title>PDFMiner</title>
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</head>
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<body>
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<div align=right class=lastmod>
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<!-- hhmts start -->
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Last Modified: Wed Jun 25 10:27:52 UTC 2014
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<!-- hhmts end -->
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</div>
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<h1>PDFMiner</h1>
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<p>
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Python PDF parser and analyzer
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<p>
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<a href="http://www.unixuser.org/~euske/python/pdfminer/index.html">Homepage</a>
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<a href="#changes">Recent Changes</a>
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<a href="programming.html">PDFMiner API</a>
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<ul>
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<li> <a href="#intro">What's It?</a>
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<li> <a href="#download">Download</a>
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<li> <a href="#wheretoask">Where to Ask</a>
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<li> <a href="#install">How to Install</a>
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<ul>
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<li> <a href="#cmap">CJK languages support</a>
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</ul>
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<li> <a href="#tools">Command Line Tools</a>
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<ul>
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<li> <a href="#pdf2txt">pdf2txt.py</a>
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<li> <a href="#dumppdf">dumppdf.py</a>
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<li> <a href="programming.html">PDFMiner API</a>
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</ul>
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<li> <a href="#changes">Changes</a>
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<li> <a href="#todo">TODO</a>
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<li> <a href="#related">Related Projects</a>
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<li> <a href="#license">Terms and Conditions</a>
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</ul>
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<h2><a name="intro">What's It?</a></h2>
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<p>
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PDFMiner is a tool for extracting information from PDF documents.
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Unlike other PDF-related tools, it focuses entirely on getting
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and analyzing text data. PDFMiner allows one to obtain
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the exact location of text in a page, as well as
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other information such as fonts or lines.
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It includes a PDF converter that can transform PDF files
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into other text formats (such as HTML). It has an extensible
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PDF parser that can be used for other purposes than text analysis.
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<p>
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<h3>Features</h3>
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<ul>
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<li> Written entirely in Python. (for version 2.6 or newer)
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<li> Parse, analyze, and convert PDF documents.
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<li> PDF-1.7 specification support. (well, almost)
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<li> CJK languages and vertical writing scripts support.
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<li> Various font types (Type1, TrueType, Type3, and CID) support.
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<li> Basic encryption (RC4) support.
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<li> PDF to HTML conversion (with a sample converter web app).
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<li> Outline (TOC) extraction.
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<li> Tagged contents extraction.
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<li> Reconstruct the original layout by grouping text chunks.
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</ul>
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<p>
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PDFMiner is about 20 times slower than
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other C/C++-based counterparts such as XPdf.
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<P>
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<strong>Online Demo:</strong> (pdf -> html conversion webapp)<br>
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<a href="http://pdf2html.tabesugi.net:8080/">
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http://pdf2html.tabesugi.net:8080/
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</a>
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<h3><a name="download">Download</a></h3>
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<p>
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<strong>Source distribution:</strong><br>
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<a href="http://pypi.python.org/pypi/pdfminer/">
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http://pypi.python.org/pypi/pdfminer/
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</a>
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<P>
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<strong>github:</strong><br>
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<a href="https://github.com/euske/pdfminer/">
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https://github.com/euske/pdfminer/
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</a>
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<h3><a name="wheretoask">Where to Ask</a></h3>
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<p>
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<p>
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<strong>Questions and comments:</strong><br>
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<a href="http://groups.google.com/group/pdfminer-users/">
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http://groups.google.com/group/pdfminer-users/
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</a>
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<h2><a name="install">How to Install</a></h2>
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<ol>
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<li> Install <a href="http://www.python.org/download/">Python</a> 2.6 or newer.
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(<font color=red><strong>Python 3 is not supported.</strong></font>)
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<li> Download the <a href="#source">PDFMiner source</a>.
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<li> Unpack it.
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<li> Run <code>setup.py</code> to install:<br>
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<blockquote><pre>
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# <strong>python setup.py install</strong>
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</pre></blockquote>
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<li> Do the following test:<br>
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<blockquote><pre>
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$ <strong>pdf2txt.py samples/simple1.pdf</strong>
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Hello
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World
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Hello
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World
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H e l l o
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W o r l d
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H e l l o
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W o r l d
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</pre></blockquote>
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<li> Done!
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</ol>
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<h3><a name="cmap">For CJK languages</a></h3>
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<p>
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In order to process CJK languages, you need an additional step to take
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during installation:
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<blockquote><pre>
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# <strong>make cmap</strong>
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python tools/conv_cmap.py pdfminer/cmap Adobe-CNS1 cmaprsrc/cid2code_Adobe_CNS1.txt
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reading 'cmaprsrc/cid2code_Adobe_CNS1.txt'...
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writing 'CNS1_H.py'...
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...
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<em>(this may take several minutes)</em>
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# <strong>python setup.py install</strong>
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</pre></blockquote>
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<p>
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On Windows machines which don't have <code>make</code> command,
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paste the following commands on a command line prompt:
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<blockquote><pre>
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<strong>mkdir pdfminer\cmap</strong>
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<strong>python tools\conv_cmap.py -c B5=cp950 -c UniCNS-UTF8=utf-8 pdfminer\cmap Adobe-CNS1 cmaprsrc\cid2code_Adobe_CNS1.txt</strong>
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<strong>python tools\conv_cmap.py -c GBK-EUC=cp936 -c UniGB-UTF8=utf-8 pdfminer\cmap Adobe-GB1 cmaprsrc\cid2code_Adobe_GB1.txt</strong>
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<strong>python tools\conv_cmap.py -c RKSJ=cp932 -c EUC=euc-jp -c UniJIS-UTF8=utf-8 pdfminer\cmap Adobe-Japan1 cmaprsrc\cid2code_Adobe_Japan1.txt</strong>
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<strong>python tools\conv_cmap.py -c KSC-EUC=euc-kr -c KSC-Johab=johab -c KSCms-UHC=cp949 -c UniKS-UTF8=utf-8 pdfminer\cmap Adobe-Korea1 cmaprsrc\cid2code_Adobe_Korea1.txt</strong>
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<strong>python setup.py install</strong>
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</pre></blockquote>
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<h2><a name="tools">Command Line Tools</a></h2>
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<p>
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PDFMiner comes with two handy tools:
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<code>pdf2txt.py</code> and <code>dumppdf.py</code>.
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<h3><a name="pdf2txt">pdf2txt.py</a></h3>
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<p>
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<code>pdf2txt.py</code> extracts text contents from a PDF file.
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It extracts all the text that are to be rendered programmatically,
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i.e. text represented as ASCII or Unicode strings.
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It cannot recognize text drawn as images that would require optical character recognition.
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It also extracts the corresponding locations, font names, font sizes, writing
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direction (horizontal or vertical) for each text portion.
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You need to provide a password for protected PDF documents when its access is restricted.
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You cannot extract any text from a PDF document which does not have extraction permission.
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<p>
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<strong>Note:</strong>
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Not all characters in a PDF can be safely converted to Unicode.
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<h4>Examples</h4>
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<blockquote><pre>
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$ <strong>pdf2txt.py -o output.html samples/naacl06-shinyama.pdf</strong>
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(extract text as an HTML file whose filename is output.html)
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$ <strong>pdf2txt.py -V -c euc-jp -o output.html samples/jo.pdf</strong>
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(extract a Japanese HTML file in vertical writing, CMap is required)
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$ <strong>pdf2txt.py -P mypassword -o output.txt secret.pdf</strong>
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(extract a text from an encrypted PDF file)
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</pre></blockquote>
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<h4>Options</h4>
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<dl>
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<dt> <code>-o <em>filename</em></code>
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<dd> Specifies the output file name.
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By default, it prints the extracted contents to stdout in text format.
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<p>
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<dt> <code>-p <em>pageno[,pageno,...]</em></code>
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<dd> Specifies the comma-separated list of the page numbers to be extracted.
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Page numbers start at one.
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By default, it extracts text from all the pages.
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<p>
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<dt> <code>-c <em>codec</em></code>
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<dd> Specifies the output codec.
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<p>
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<dt> <code>-t <em>type</em></code>
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<dd> Specifies the output format. The following formats are currently supported.
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<ul>
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<li> <code>text</code> : TEXT format. (Default)
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<li> <code>html</code> : HTML format. Not recommended for extraction purposes because the markup is messy.
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<li> <code>xml</code> : XML format. Provides the most information.
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<li> <code>tag</code> : "Tagged PDF" format. A tagged PDF has its own contents annotated with
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HTML-like tags. pdf2txt tries to extract its content streams rather than inferring its text locations.
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Tags used here are defined in the PDF specification (See §10.7 "<em>Tagged PDF</em>").
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</ul>
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<p>
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<dt> <code>-I <em>image_directory</em></code>
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<dd> Specifies the output directory for image extraction.
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Currently only JPEG images are supported.
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<p>
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<dt> <code>-M <em>char_margin</em></code>
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<dt> <code>-L <em>line_margin</em></code>
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<dt> <code>-W <em>word_margin</em></code>
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<dd> These are the parameters used for layout analysis.
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In an actual PDF file, text portions might be split into several chunks
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in the middle of its running, depending on the authoring software.
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Therefore, text extraction needs to splice text chunks.
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In the figure below, two text chunks whose distance is closer than
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the <em>char_margin</em> (shown as <em><font color="red">M</font></em>) is considered
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continuous and get grouped into one. Also, two lines whose distance is closer than
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the <em>line_margin</em> (<em><font color="blue">L</font></em>) is grouped
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as a text box, which is a rectangular area that contains a "cluster" of text portions.
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Furthermore, it may be required to insert blank characters (spaces) as necessary
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if the distance between two words is greater than the <em>word_margin</em>
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(<em><font color="green">W</font></em>), as a blank between words might not be
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represented as a space, but indicated by the positioning of each word.
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<p>
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Each value is specified not as an actual length, but as a proportion of
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the length to the size of each character in question. The default values
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are M = 2.0, L = 0.5, and W = 0.1, respectively.
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<table style="border:2px gray solid; margin: 10px; padding: 10px;"><tr>
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<td style="border-right:1px red solid" align=right>→</td>
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<td style="border-left:1px red solid" colspan="4" align=left>← <em><font color="red">M</font></em></td>
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<td></td>
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</tr><tr>
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<td style="border:1px solid"><code>Q u i</code></td>
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<td style="border:1px solid"><code>c k</code></td>
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<td width="10px"></td>
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<td style="border:1px solid"><code>b r o w</code></td>
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<td style="border:1px solid"><code>n f o x</code></td>
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<td style="border-bottom:1px blue solid" align=right>↓</td>
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</tr><tr>
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<td style="border-right:1px green solid" colspan="2" align=right>→</td><td></td>
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<td style="border-left:1px green solid" colspan="2" align=left>← <em><font color="green">W</font></em></td>
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<td rowspan="2" valign=center align=center><em><font color="blue">L</font></em></td>
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</tr><tr height="10px">
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</tr><tr>
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<td style="padding:0px;" colspan="5">
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<table style="border:1px solid"><tr><td><code>j u m p s</code></td><td>...</td></tr></table>
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</td>
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<td style="border-top:1px blue solid" align=right>↑</td>
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</tr></table>
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<p>
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<dt> <code>-F <em>boxes_flow</em></code>
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<dd> Specifies how much a horizontal and vertical position of a text matters
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when determining a text order. The value should be within the range of
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-1.0 (only horizontal position matters) to +1.0 (only vertical position matters).
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The default value is 0.5.
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<p>
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<dt> <code>-C</code>
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<dd> Suppress object caching.
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This will reduce the memory consumption but also slows down the process.
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<p>
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<dt> <code>-n</code>
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<dd> Suppress layout analysis.
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<p>
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<dt> <code>-A</code>
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<dd> Forces to perform layout analysis for all the text strings,
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including text contained in figures.
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<p>
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<dt> <code>-V</code>
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<dd> Allows vertical writing detection.
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<p>
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<dt> <code>-Y <em>layout_mode</em></code>
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<dd> Specifies how the page layout should be preserved. (Currently only applies to HTML format.)
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<ul>
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<li> <code>exact</code> : preserve the exact location of each individual character (a large and messy HTML).
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<li> <code>normal</code> : preserve the location and line breaks in each text block. (Default)
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<li> <code>loose</code> : preserve the overall location of each text block.
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</ul>
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<p>
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<dt> <code>-E <em>extractdir</em></code>
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<dd> Specifies the extraction directory of embedded files.
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<p>
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<dt> <code>-s <em>scale</em></code>
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<dd> Specifies the output scale. Can be used in HTML format only.
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<p>
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<dt> <code>-m <em>maxpages</em></code>
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<dd> Specifies the maximum number of pages to extract.
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By default, it extracts all the pages in a document.
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<p>
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<dt> <code>-P <em>password</em></code>
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<dd> Provides the user password to access PDF contents.
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<p>
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<dt> <code>-d</code>
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<dd> Increases the debug level.
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</dl>
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<hr noshade>
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<h3><a name="dumppdf">dumppdf.py</a></h3>
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<p>
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<code>dumppdf.py</code> dumps the internal contents of a PDF file
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in pseudo-XML format. This program is primarily for debugging purposes,
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but it's also possible to extract some meaningful contents
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(such as images).
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<h4>Examples</h4>
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<blockquote><pre>
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$ <strong>dumppdf.py -a foo.pdf</strong>
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(dump all the headers and contents, except stream objects)
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$ <strong>dumppdf.py -T foo.pdf</strong>
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(dump the table of contents)
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$ <strong>dumppdf.py -r -i6 foo.pdf > pic.jpeg</strong>
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(extract a JPEG image)
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</pre></blockquote>
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<h4>Options</h4>
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<dl>
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<dt> <code>-a</code>
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<dd> Instructs to dump all the objects.
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By default, it only prints the document trailer (like a header).
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<p>
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<dt> <code>-i <em>objno,objno, ...</em></code>
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<dd> Specifies PDF object IDs to display.
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Comma-separated IDs, or multiple <code>-i</code> options are accepted.
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<p>
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<dt> <code>-p <em>pageno,pageno, ...</em></code>
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<dd> Specifies the page number to be extracted.
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Comma-separated page numbers, or multiple <code>-p</code> options are accepted.
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Note that page numbers start at one, not zero.
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<p>
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<dt> <code>-r</code> (raw)
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<dt> <code>-b</code> (binary)
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<dt> <code>-t</code> (text)
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<dd> Specifies the output format of stream contents.
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Because the contents of stream objects can be very large,
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they are omitted when none of the options above is specified.
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<p>
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With <code>-r</code> option, the "raw" stream contents are dumped without decompression.
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With <code>-b</code> option, the decompressed contents are dumped as a binary blob.
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With <code>-t</code> option, the decompressed contents are dumped in a text format,
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similar to <code>repr()</code> manner. When
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<code>-r</code> or <code>-b</code> option is given,
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no stream header is displayed for the ease of saving it to a file.
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<p>
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<dt> <code>-T</code>
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<dd> Shows the table of contents.
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<p>
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<dt> <code>-E <em>directory</em></code>
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<dd> Extracts embedded files from the pdf into the given directory.
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<p>
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<dt> <code>-P <em>password</em></code>
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<dd> Provides the user password to access PDF contents.
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<p>
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<dt> <code>-d</code>
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<dd> Increases the debug level.
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</dl>
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<h2><a name="changes">Changes</a></h2>
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<ul>
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<li> 2014/03/28: Further bugfixes.
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<li> 2014/03/24: Bugfixes and improvements for fauly PDFs.<br>
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API changes:
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<ul>
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<li> <code>PDFDocument.initialize()</code> method is removed and no longer needed.
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A password is given as an argument of a PDFDocument constructor.
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</ul>
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<li> 2013/11/13: Bugfixes and minor improvements.<br>
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As of November 2013, there were a few changes made to the PDFMiner API
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prior to October 2013. This is the result of code restructuring. Here
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is a list of the changes:
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<ul>
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<li> <code>PDFDocument</code> class is moved to <code>pdfdocument.py</code>.
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<li> <code>PDFDocument</code> class now takes a <code>PDFParser</code> object as an argument.
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<li> <code>PDFDocument.set_parser()</code> and <code>PDFParser.set_document()</code> is removed.
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<li> <code>PDFPage</code> class is moved to <code>pdfpage.py</code>.
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<li> <code>process_pdf</code> function is implemented as <code>PDFPage.get_pages</code>.
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</ul>
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<li> 2013/10/22: Sudden resurge of interests. API changes.
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Incorporated a lot of patches and robust handling of broken PDFs.
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<li> 2011/05/15: Speed improvements for layout analysis.
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<li> 2011/05/15: API changes. <code>LTText.get_text()</code> is added.
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<li> 2011/04/20: API changes. LTPolygon class was renamed as LTCurve.
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<li> 2011/04/20: LTLine now represents horizontal/vertical lines only. Thanks to Koji Nakagawa.
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<li> 2011/03/07: Documentation improvements by Jakub Wilk. Memory usage patch by Jonathan Hunt.
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<li> 2011/02/27: Bugfixes and layout analysis improvements. Thanks to fujimoto.report.
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<li> 2010/12/26: A couple of bugfixes and minor improvements. Thanks to Kevin Brubeck Unhammer and Daniel Gerber.
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<li> 2010/10/17: A couple of bugfixes and minor improvements. Thanks to standardabweichung and Alastair Irving.
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<li> 2010/09/07: A minor bugfix. Thanks to Alexander Garden.
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<li> 2010/08/29: A couple of bugfixes. Thanks to Sahan Malagi, pk, and Humberto Pereira.
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<li> 2010/07/06: Minor bugfixes. Thanks to Federico Brega.
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<li> 2010/06/13: Bugfixes and improvements on CMap data compression. Thanks to Jakub Wilk.
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<li> 2010/04/24: Bugfixes and improvements on TOC extraction. Thanks to Jose Maria.
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<li> 2010/03/26: Bugfixes. Thanks to Brian Berry and Lubos Pintes.
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<li> 2010/03/22: Improved layout analysis. Added regression tests.
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<li> 2010/03/12: A couple of bugfixes. Thanks to Sean Manefield.
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<li> 2010/02/27: Changed the way of internal layout handling. (LTTextItem -> LTChar)
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<li> 2010/02/15: Several bugfixes. Thanks to Sean.
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<li> 2010/02/13: Bugfix and enhancement. Thanks to André Auzi.
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<li> 2010/02/07: Several bugfixes. Thanks to Hiroshi Manabe.
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<li> 2010/01/31: JPEG image extraction supported. Page rotation bug fixed.
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<li> 2010/01/04: Python 2.6 warning removal. More doctest conversion.
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<li> 2010/01/01: CMap bug fix. Thanks to Winfried Plappert.
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<li> 2009/12/24: RunLengthDecode filter added. Thanks to Troy Bollinger.
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<li> 2009/12/20: Experimental polygon shape extraction added. Thanks to Yusuf Dewaswala for reporting.
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<li> 2009/12/19: CMap resources are now the part of the package. Thanks to Adobe for open-sourcing them.
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<li> 2009/11/29: Password encryption bug fixed. Thanks to Yannick Gingras.
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<li> 2009/10/31: SGML output format is changed and renamed as XML.
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<li> 2009/10/24: Charspace bug fixed. Adjusted for 4-space indentation.
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<li> 2009/10/04: Another matrix operation bug fixed. Thanks to Vitaly Sedelnik.
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<li> 2009/09/12: Fixed rectangle handling. Able to extract image boundaries.
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<li> 2009/08/30: Fixed page rotation handling.
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|
<li> 2009/08/26: Fixed zlib decoding bug. Thanks to Shon Urbas.
|
|
<li> 2009/08/24: Fixed a bug in character placing. Thanks to Pawan Jain.
|
|
<li> 2009/07/21: Improvement in layout analysis.
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<li> 2009/07/11: Improvement in layout analysis. Thanks to Lubos Pintes.
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|
<li> 2009/05/17: Bugfixes, massive code restructuring, and simple graphic element support added. setup.py is supported.
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|
<li> 2009/03/30: Text output mode added.
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<li> 2009/03/25: Encoding problems fixed. Word splitting option added.
|
|
<li> 2009/02/28: Robust handling of corrupted PDFs. Thanks to Troy Bollinger.
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<li> 2009/02/01: Various bugfixes. Thanks to Hiroshi Manabe.
|
|
<li> 2009/01/17: Handling a trailer correctly that contains both /XrefStm and /Prev entries.
|
|
<li> 2009/01/10: Handling Type3 font metrics correctly.
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|
<li> 2008/12/28: Better handling of word spacing. Thanks to Christian Nentwich.
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|
<li> 2008/09/06: A sample pdf2html webapp added.
|
|
<li> 2008/08/30: ASCII85 encoding filter support.
|
|
<li> 2008/07/27: Tagged contents extraction support.
|
|
<li> 2008/07/10: Outline (TOC) extraction support.
|
|
<li> 2008/06/29: HTML output added. Reorganized the directory structure.
|
|
<li> 2008/04/29: Bugfix for Win32. Thanks to Chris Clark.
|
|
<li> 2008/04/27: Basic encryption and LZW decoding support added.
|
|
<li> 2008/01/07: Several bugfixes. Thanks to Nick Fabry for his vast contribution.
|
|
<li> 2007/12/31: Initial release.
|
|
<li> 2004/12/24: Start writing the code out of boredom...
|
|
</ul>
|
|
|
|
<h2><a name="todo">TODO</a></h2>
|
|
<ul>
|
|
<li> <A href="http://www.python.org/dev/peps/pep-0008/">PEP-8</a> and
|
|
<a href="http://www.python.org/dev/peps/pep-0257/">PEP-257</a> conformance.
|
|
<li> Better documentation.
|
|
<li> Better text extraction / layout analysis. (writing mode detection, Type1 font file analysis, etc.)
|
|
<li> Crypt stream filter support. (More sample documents are needed!)
|
|
</ul>
|
|
|
|
<h2><a name="related">Related Projects</a></h2>
|
|
<ul>
|
|
<li> <a href="http://pybrary.net/pyPdf/">pyPdf</a>
|
|
<li> <a href="http://www.foolabs.com/xpdf/">xpdf</a>
|
|
<li> <a href="http://www.pdfbox.org/">pdfbox</a>
|
|
<li> <a href="http://mupdf.com/">mupdf</a>
|
|
</ul>
|
|
|
|
<h2><a name="license">Terms and Conditions</a></h2>
|
|
<p>
|
|
(This is so-called MIT/X License)
|
|
<p>
|
|
<small>
|
|
Copyright (c) 2004-2013 Yusuke Shinyama <yusuke at cs dot nyu dot edu>
|
|
<p>
|
|
Permission is hereby granted, free of charge, to any person
|
|
obtaining a copy of this software and associated documentation
|
|
files (the "Software"), to deal in the Software without
|
|
restriction, including without limitation the rights to use,
|
|
copy, modify, merge, publish, distribute, sublicense, and/or
|
|
sell copies of the Software, and to permit persons to whom the
|
|
Software is furnished to do so, subject to the following
|
|
conditions:
|
|
<p>
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
<p>
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
|
|
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
|
|
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
|
|
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
|
|
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
</small>
|
|
|
|
<hr noshade>
|
|
<address>Yusuke Shinyama (yusuke at cs dot nyu dot edu)</address>
|
|
</body>
|