Tesseract centos环境安装，基于springboot图片提取文字

下载tesseract-orc

https://github.com/tesseract-ocr/tesseract/tags

下载leptonica

wget http://www.leptonica.org/source/leptonica-1.78.0.tar.gz

解压leptonica
tar -xvf leptonica-1.78.0.tar.gz
配置编译安装leptonica
进文件夹

./configure
make
make install

安装automake和libtool

yum install automake
yum install libtool

配置leptonica环境变量

vi /etc/profileexport LD_LIBRARY_PATH=/usr/local/lib
export LIBLEPT_HEADERSDIR=/usr/local/include
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfigsource /etc/profile

安装tesseract-ocr
进文件夹

./autogen.sh
./configure
make
make install

编译的时候遇到问题
Your-compiler-does-not-have-the-necessary-C17-support
执行

yum install -y centos-release-scl
yum install devtoolset-8-gcc*
scl enable devtoolset-8 bash

重新编译

测试是否安装成功,执行

ldconfig
tesseract --version

将下载的语言包复制到/usr/local/share/tessdata
最新包

<dependency><groupId>net.sourceforge.tess4j</groupId><artifactId>tess4j</artifactId><version>5.6.0</version>
</dependency>
springboot 解决 jna 找不到对应的文件<dependency><groupId>net.java.dev.jna</groupId><artifactId>jna</artifactId><version>5.13.0</version>
</dependency>

demo

@PostMapping("/upload")
public String testFile(MultipartFile file){try {Tesseract instance = new Tesseract();instance.setLanguage("eng+chi_sim");instance.setHocr(false);instance.setPageSegMode(ITessAPI.TessPageSegMode.PSM_AUTO_OSD);instance.setOcrEngineMode(TessAPI.TessOcrEngineMode.OEM_LSTM_ONLY);PDDocument document = PDDocument.load(file.getInputStream());PDFRenderer pdfRenderer = new PDFRenderer(document);BufferedImage bim = pdfRenderer.renderImageWithDPI(0, 200, ImageType.RGB);String result = instance.doOCR(bim);return result;} catch (IOException | TesseractException e) {e.printStackTrace();}return "";
}