Compile and install Tesseract-OCR in centos

Compile and install Tesseract-ocrposted on in centos

2012-01-30
York_gu

It has been nearly three months since the previous blog titled automatic identification of simple verification Codes Using gocr. Recently, verification codes have been cracked again, but this time, the verification code is more complicated. gocr is not powerful enough. The accuracy of pure digital recognition is indeed high, but the mixed numbers and letters cannot be handled. So this time, we changed Tesseract-OCR to an advanced one.

As the most popular free Linux release version, the yum that comes with centos is really bad, not even Tesseract-OCR.

Install tesseract. First install some dependent libraries.

1234	wgettar xvf leptonica-1.68.tar.gzcd leptonica-1.68./configure; make; make install

Then, the source code of tesseract is compiled and installed. When writing this blog post, the latest tesseract version is 3.0.1.

123456

wgettar xvf tesseract-3.0.1.tar.gzcd tesseract-3.0.1./autogen.shmkdir m4; ./configuremake; make install

The compilation and installation of tesseract requires automake and libtool, which can be directly installed through yum. In addition to this, the source code of tesseract also contains a trap that requires manual adjustment before compilation passes:

12	vim ccutil/strngs.hDelete the first garbled character in the header of the first line, that is, the word <feff> is displayed in vim.

After the compilation and installation are complete, you also need to install the corresponding language pack. When installing the Language Pack, you only need to decompress the Language Pack and put it in the corresponding directory.

12	tar xvf tesseract-ocr-3.01.eng.tar.gzmv tesseract-ocr/tessdata/* /usr/local/share/tessdata/