mirror of
https://github.com/tesseract-ocr/tesseract.git
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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@681 d0cd1f9f-072b-0410-8dd7-cf729c803f20
253 lines
10 KiB
Plaintext
253 lines
10 KiB
Plaintext
:version: $RCSfile: index.rst,v $ $Revision: 76e0bf38aaba $ $Date: 2011/03/22 00:48:41 $
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.. default-role:: fs
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==================
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Handy free tools
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==================
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`TortoiseSVN <http://tortoisesvn.net/>`_
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----------------------------------------
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The |Tesseractocr| source lives in an SVN repository at `Google Code
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<http://code.google.com/p/tesseract-ocr/source/checkout>`_, so to
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:ref:`build the latest versions <using-latest-sources>` you'll need to
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know SVN. For newcomers (or not), TortoiseSVN (http://tortoisesvn.net/)
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is a great alternative to the SVN command line interface.
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"TortoiseSVN is an easy-to-use SCM / source control software for
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Microsoft Windows and possibly the best standalone Apache Subversion
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client there is. It is implemented as a Windows shell extension, which
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makes it integrate seamlessly into the Windows explorer. Since it's not
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an integration for a specific IDE you can use it with whatever
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development tools you like."
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`JP Software TCC/LE <http://jpsoft.com/tccle_cmd_replacement.html>`_
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--------------------------------------------------------------------
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Instead of using Windows' plain old Command Prompt window --- and less
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intimidating than using the bash shell from `cygwin
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<http://cygwin.com/>`_ or `MSYS <http://mingw.org/wiki/msys>`_ --- the
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"TCC/LE - Windows CMD Replacement Command Console" by JP Software is
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definitely worth trying. It is available at
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http://jpsoft.com/tccle_cmd_replacement.html.
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For example, to look for all the settable options in |Tesseractocr|,
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try::
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C:\BuildFolder\tesseract-3.02\
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ffind /s/v/c/t"_MEMBER" *.cpp | list/s
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and you'll get something that looks like this in the `list` viewer::
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---- C:\BuildFolder\tesseract-3.02\ccmain\tesseractclass.cpp
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: BOOL_MEMBER(tessedit_resegment_from_boxes, false,
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BOOL_MEMBER(tessedit_resegment_from_line_boxes, false,
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BOOL_MEMBER(tessedit_train_from_boxes, false,
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BOOL_MEMBER(tessedit_make_boxes_from_boxes, false,
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BOOL_MEMBER(tessedit_dump_pageseg_images, false,
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...
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double_MEMBER(segsearch_max_char_wh_ratio, 2.0,
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double_MEMBER(segsearch_max_fixed_pitch_char_wh_ratio, 2.0,
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BOOL_MEMBER(save_alt_choices, false,
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413 lines in 7 files
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(Press the :kbd:`Escape` key to exit the `list` viewer).
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The equivalent(?) Linux incantation, copied and slightly modified from
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the grep info, is::
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find . -name '*.cpp' -print0 | xargs -0r grep -H '_MEMBER' | less
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Note: You can also do this directly in Visual Studio 2008, by choosing
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:menuselection:`&Edit --> &Find and Replace --> F&ind in Files`
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(:kbd:`Ctrl+Shift+F`), so maybe this wasn't the best example:
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.. image:: images/find_in_files.png
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:align: center
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:alt: Visual Studio 2008 Find in Files Dialog
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`Cygwin <http://cygwin.com/>`_
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------------------------------
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"`Cygwin <http://cygwin.com/>`_ is a collection of tools which provide a
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Linux look and feel environment for Windows."
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|Leptonica| actually still requires a few unix utilities (like `rm`,
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`diff`, `sleep`) for some operations and might silently fail if it they
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not present (as of v1.68). The easiest way to deal with this is to
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`install Cygwin
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<http://tpgit.github.com/UnOfficialLeptDocs/vs2008/installing-cygwin.html>`_
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or MSYS (see the next section).
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`MSYS <http://mingw.org/wiki/msys>`_
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------------------------------------
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"`MSYS <http://mingw.org/wiki/msys>`_ is a collection of GNU utilities
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such as bash, make, gawk and grep to allow building of applications and
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programs which depend on traditionally UNIX tools to be present. It is
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intended to supplement MinGW and the deficiencies of the cmd shell."
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WinDiff
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-------
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An important phase of testing `tesseract` is checking how its output
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compares to previous runs (or ground-truth files). A visual diff program
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can make that easier.
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Microsoft's WinDiff doesn't seem to come with Visual Studio
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anymore. However it can still be downloaded from `Grig Software
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<http://www.grigsoft.com/download-windiff.htm>`_ (without having to get
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all the other stuff in the `Windows XP Service Pack 2 Support Tools
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<http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=18546>`_.
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Other options are `KDiff3 <http://kdiff3.sourceforge.net/>`_ and
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`ExamDiff <http://www.prestosoft.com/edp_examdiff.asp>`_ (`ExamDiff Pro
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<http://www.prestosoft.com/edp_examdiffpro.asp>`_ is also recommended
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but it's not free).
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KDiff3 doesn't seem to correctly auto-detect UTF-8 encodings so choose
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:menuselection:`&Settings --> &Configure KDiff3...` from the menubar and
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set the :guilabel:`Regional Settings` tab as follows:
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.. image:: images/kdif3_settings.png
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:align: center
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:alt: KDiff3 Regional Settings
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Also on the :guilabel:`Integration` tab, make sure that :guilabel:`Quit
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also via Escape key` is turned on (checked). Since IrfanView also quits
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when you press the :kbd:`Esc` key, this just makes it easy to dismiss
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both applications with the same key.
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Here is KDiff3 showing the (slight) difference in OCR results after
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deskewing a grayscale image:
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.. figure:: images/sample_diff.png
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:height: 512
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:align: center
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:alt: Diff in OCR after deskewing image
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:target: _images/sample_diff.png
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`Click for larger image <_images/sample_diff.png>`__
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`IrfanView <http://www.irfanview.com/>`_
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----------------------------------------
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You need some program to view the images you are trying to OCR and since
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|Leptonica| uses IrfanView (http://www.irfanview.com/) to `automatically
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display images <http://tpgit.github.com/UnOfficialLeptDocs/vs2008/installing-irfanview.html>`_,
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you might as well use it also.
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"IrfanView is a very fast, small, compact and innovative FREEWARE (for
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non-commercial use) graphic viewer for Windows 9x, ME, NT, 2000, XP,
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Vista, Windows 7."
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Pressing the :kbd:`I` key while viewing an image with IrfanView, will
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bring up a dialog box that shows most of its important properties (like
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bits/pixel and DPI).
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`Aware Systems AsTiffTagViewer <http://www.awaresystems.be/imaging/tiff/astifftagviewer.html>`_
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-----------------------------------------------------------------------------------------------
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This utility, available at
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http://www.awaresystems.be/imaging/tiff/astifftagviewer.html, let's you
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easily determine TIFF image file properties.
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"Whenever a customer reports your software doesn't handle this or that
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particular TIFF, use AsTiffTagViewer and discover why."
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`Dependency Walker <http://dependencywalker.com/>`_
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---------------------------------------------------
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If you're having problems with missing module runtime errors, the
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Dependency Walker (http://dependencywalker.com/) usually can help track
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down the problem.
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"Dependency Walker is also very useful for troubleshooting system errors
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related to loading and executing modules. Dependency Walker detects many
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common application problems such as missing modules, invalid modules,
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import/export mismatches, circular dependency errors, mismatched machine
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types of modules, and module initialization failures."
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You probably want the 32-bit version even if you are running on a
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Windows 64-bit platform, because the current VS2008 Solution for
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|Tesseractocr| by default builds a 32-bit app. From the `FAQ
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<http://dependencywalker.com/faq.html>`_
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"There are 32-bit and 64-bit versions Dependency Walker. All versions
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are capable or opening 32-bit and 64-bit modules. However, there are
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major advantages to using the 32-bit Dependency Walker to process 32-bit
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modules and the 64-bit Dependency Walker to process 64-bit modules.
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This is especially true when running on a 64-bit version of Windows,
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which allows execution of both 32-bit and 64-bit programs. The 32-bit
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subsystem on 64-bit Windows (known as "WOW64") has its own private
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registry, "AppPaths", "KnownDlls", system folders, and manifest
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processing. Only the 32-bit version of Dependency Walker can access
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this 32-bit environment, which is needed to accurately process a 32-bit
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module. Likewise, only the 64-bit version of Dependency Walker can
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fully access the 64-bit environment, so it should always be used for
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processing 64-bit modules."
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.. figure:: images/dependency_walker.png
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:height: 640
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:align: center
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:alt: Dependency Walker view of tesseract-dlld.exe
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:target: _images/dependency_walker.png
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`Click for larger image <_images/dependency_walker.png>`__
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The above image shows Dependency Walker used on
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`tesseract-dlld.exe`. The panes show the `DLL`\ s that it is dependent
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on, the methods it actually uses from `libtesseract302d.dll`, and all
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the exported methods from `libtesseract302d.dll`. Using this it's easy
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to see that only the ``TessBaseAPI`` and ``STRING`` classes are exported
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as mentioned in :doc:`programming`.
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`Sysinternals Process Explorer <http://technet.microsoft.com/en-us/sysinternals/bb896653>`_
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-------------------------------------------------------------------------------------------
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Another essential program to help figure out what your program is doing
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is Process Explorer
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(http://technet.microsoft.com/en-us/sysinternals/bb896653).
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"The unique capabilities of Process Explorer make it useful for tracking
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down DLL-version problems or handle leaks, and provide insight into the
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way Windows and applications work."
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`VMware Player <http://www.vmware.com/products/player/>`_
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---------------------------------------------------------
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VMware Player (http://www.vmware.com/products/player/) can be used to
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install, for example, `Ubuntu 11.10 <http://www.ubuntu.com/>`_ in a
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virtual machine on Windows and see how the other half lives. It also
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helps when trying to figure out if the Windows version of `tesseract`
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acts the same way as the "original" version.
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"VMware Player is the easiest way to run multiple operating systems at
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the same time on your PC. With its user-friendly interface, VMware
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Player makes it effortless for anyone to try out Windows 8 developer
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release, Windows 7, Chrome OS or the latest Linux releases, or create
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isolated virtual machines to safely test new software and surf the Web."
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..
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Local Variables:
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coding: utf-8
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mode: rst
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indent-tabs-mode: nil
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sentence-end-double-space: t
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fill-column: 72
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mode: auto-fill
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standard-indent: 3
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tab-stop-list: (3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60)
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End:
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