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99 lines
3.9 KiB
Plaintext
99 lines
3.9 KiB
Plaintext
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Overview
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========
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OCR (Optical Character Recognition) is a technique used to
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extract text from images. In the World of Subtitle, subtitle stored
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in bitmap format are common and even necessary for converting subtitle
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in bitmap format to subtitle in text format OCR is used.
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Dependency
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==========
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Tesseract (OCR library by Google)
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Leptonica (Image processing library)
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Ubuntu install Dependency using package manager
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===============================================
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sudo apt-get install libleptonica-dev libtesseract-dev tesseract-ocr-eng
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How to compile CCExtractor on Linux with OCR
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=============================================
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Download and Install Leptonnica.
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-------------------------------
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This package is available, you need liblept-devel library.
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If Leptonica isn't available for your distribution, or you want to use a newer version
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than they offer, you can compile your own.
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you can download lib leptonica from http://www.leptonica.com/download.html
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Download and Install Tesseract.
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-------------------------------
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Tesseract is available directly from many Linux distributions. The package is generally
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called 'tesseract' or 'tesseract-ocr' - search your distribution's repositories to
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find it. Packages are also generally available for language training data (search the
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repositories,) but if not you will need to download the appropriate training data,
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unpack it, and copy the .traineddata file into the 'tessdata' directory, probably
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/usr/share/tesseract-ocr/tessdata or /usr/share/tessdata.
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If Tesseract isn't available for your distribution, or you want to use a newer version
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than they offer, you can compile your own.
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If you compile Tesseract then following command in its source code are enough
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./autogen.sh
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./configure
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make
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sudo make install
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sudo ldconfig
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Note:
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1) CCExtractor is tested with Tesseract 3.04 version but it works with older versions.
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you can download tesseract from https://github.com/tesseract-ocr/tesseract/archive/3.04.00.tar.gz
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you can download tesseract training data from https://github.com/tesseract-ocr/tessdata/archive/3.04.00.tar.gz
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Compile CCExtractor passing flags like following
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-------------------------------------------------
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make ENABLE_OCR=yes
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How to compile CCExtractor on Windows with OCR
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===============================================
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Download prebuild library of leptonica and tesseract from following link
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https://drive.google.com/file/d/0B2ou7ZfB-2nZOTRtc3hJMHBtUFk/view?usp=sharing
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put the path of libs/include of leptonica and tesseract in library paths.
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step 1) In visual studio 2013 right click <Project> and select property.
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step 2) Select Configuration properties in left panel(column) of property.
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step 3) Select VC++ Directory.
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step 4) In the right pane, in the right-hand column of the VC++ Directory property,
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open the drop-down menu and choose Edit.
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Step 5) Add path of Directory where you have kept uncompressed library of leptonica
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and tesseract.
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Set preprocessor flag ENABLE_OCR=1
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Step 1) In visual studio 2013 right click <Project> and select property.
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Step 2) In the left panel, select Configuration Properties, C/C++, Preprocessor.
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Step 3) In the right panel, in the right-hand column of the Preprocessor Definitions property, open the drop-down menu and choose Edit.
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Step 4) In the Preprocessor Definitions dialog box, add ENABLE_OCR=1. Choose OK to save your changes.
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Add library in linker
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step 1) Open property of project
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Step 2) Select Configuration properties
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Step 3) Select Linker in left panel(column)
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Step 4) Select Input
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Step 5) Select Additional dependencies in right panel
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Step 6) Add libtesseract304d.lib in new line
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Step 7) Add liblept172.lib in new line
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Download language data from following link
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https://code.google.com/p/tesseract-ocr/downloads/list
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after downloading the tesseract-ocr-3.02.eng.tar.gz extract the tar file and put
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tessdata folder where you have kept CCExtractor executable
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Copy the tesseract and leptonica dll from lib folder downloaded from above link to folder of executable or in system32.
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