Install TESSERACT-OCR under Linux

1. Can be installed automatically under Ubuntu

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sudo apt-get install TESSERACT-OCR


2. Compiling the installation

A. Compilation environment: GCC gcc-c++ make (this environment is common for machines, can be ignored)

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Yum install gcc gcc-c++ make


B. Install the required packages for TESSERACT-OCR compilation

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1120.www.qixoo.qixoo.com/yum/apt-get Install autoconf Automake libtool


C. Add package for image parsing, select package according to specified format

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Yum install libjpeg-devel libpng-devel libtiff-devel zlib-devel


Ubuntu

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sudo apt-get install Libpng12-dev
sudo apt-get install Libjpeg62-dev
sudo apt-get install Libtiff4-dev


d. Download Leptonica Package: http://www.leptonica.org/source/leptonica-1.71.tar.gz
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wget http://www.leptonica.org/source/leptonica-1.71.tar.gz
TAR-ZXVF ...
./configure
Make
Make install


It is important to note that the Leptonica version issue

3.01 requires at least v1.67 of Leptonica.
3.02 requires at least v1.69 of Leptonica. (Both available in Ubuntu 12.04 precise pangolin.)
3.03 requires at least v1.70 of Leptonica. (Both available in Ubuntu 14.04 trusty Tahr.)

If the version is inconsistent, the following problems occur:

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Tesseract Open Source OCR Engine v3.02.02 with Leptonica
Error in Findtiffcompression:function not present
Error in Pixreadstreamtiff:function not present
Error in PixReadStream:tiff:no Pix returned
Error in Pixread:pix not read
Unsupported image type.



E. Download tesseract-3.02 installation package: http://tesseract-ocr.googlecode.com/files/tesseract-3.02.02.tar.gz

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wget http://tesseract-ocr.googlecode.com/files/tesseract-ocr-3.02.02.tar.gz
. qkxue.net/autogen.sh
./configure
Make
Make install
Ldconfig


F. Download tesseract-3.02 English Language pack: http://tesseract-ocr.googlecode.com/files/tesseract-ocr-3.02.eng.tar.gz, after decompression will All files under Tesseract-ocr/tessdata are copied to/usr/local/share/tessdata.



Test

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Tesseract phototest.tif Phototest-l Eng

In this case, a phototest.txt text file should be generated in the current directory, and the content is the text displayed phototest.tif.
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Install TESSERACT-OCR under Linux