centos上 java使用Tesseract进行ocr识别

1、安装过程：

安装ocr

yum install tesseract-ocr

查找中文包
yum search tesseract-ocr | grep sim

安装中文包
yum install   tesseract-langpack-chi_sim

 

安装版本信息：

? test-ugc-api01 tesseract tesseract -v
tesseract 3.04.00
leptonica-1.72
  libgif 4.1.6(?) : libjpeg 6b (libjpeg-turbo 1.2.90) : libpng 1.5.13 : libtiff 4.0.3 : zlib 1.2.7 : libwebp 0.3.0

 

2、java开发

注意版本匹配：3.04.00，采用tess4j

<dependency>    <groupId>net.sourceforge.tess4j</groupId>    <artifactId>tess4j</artifactId>    <version>3.0.0</version></dependency>

 

简单测试代码

    public String ocr(String url) {        String datapath = "/usr/share/tesseract/";        String language="chi_sim";        //进行相关的检测        try {            url = url.trim();            System.out.println("url is:"+url);            URL targetUrl = new URL(url);            BufferedImage image = ImageIO.read(targetUrl);            ByteBuffer buf = ImageIOHelper.convertImageData(image);            int bpp = image.getColorModel().getPixelSize();            int bytespp = bpp / 8;            int bytespl = (int) Math.ceil(image.getWidth() * bpp / 8.0);            System.out.println("bpp is:"+bpp+";bytespp is:"+bytespp+";bytespl is:"+bytespl);            //初始化            ITessAPI.TessBaseAPI handle = TessAPI1.TessBaseAPICreate();            TessAPI1.TessBaseAPIInit3(handle, datapath, language);            TessAPI1.TessBaseAPISetPageSegMode(handle, ITessAPI.TessPageSegMode.PSM_AUTO);            Pointer utf8Text = TessAPI1.TessBaseAPIRect(handle, buf, bytespp, bytespl, 0, 0, image.getWidth(), image.getHeight());            String result = utf8Text.getString(0);            TessAPI1.TessDeleteText(utf8Text);            TessAPI1.TessBaseAPIDelete(handle);            System.out.println("==============================================");            System.out.println("result is:"+result);            System.out.println("==============================================");            if (result.equalsIgnoreCase("")){                System.out.println("no detected words!!");            }            return result;        }catch (Exception ex){            ex.printStackTrace();        }        return "no detected words!!";    }

注意：datapath要设置在tessdata的上一级目录

3、yum安装所在目录查询相关命令

#查询相关包test-ugc-api01 tesseract rpm -qa|grep tesseract tesseract-langpack-chi_sim-3.04.00-3.el7.noarchtesseract-3.04.00-3.el7.x86_64#查询包具体安装位置test-ugc-api01 tesseract rpm -ql tesseract-3.04.00-3.el7.x86_64/usr/bin/ambiguous_words/usr/bin/classifier_tester/usr/bin/cntraining/usr/bin/combine_tessdata/usr/bin/dawg2wordlist/usr/bin/mftraining/usr/bin/set_unicharset_properties/usr/bin/shapeclustering/usr/bin/tesseract/usr/bin/text2image/usr/bin/unicharset_extractor/usr/bin/wordlist2dawg/usr/lib64/libtesseract.so.3/usr/lib64/libtesseract.so.3.0.4/usr/share/doc/tesseract-3.04.00/usr/share/doc/tesseract-3.04.00/AUTHORS/usr/share/doc/tesseract-3.04.00/ChangeLog/usr/share/doc/tesseract-3.04.00/NEWS/usr/share/doc/tesseract-3.04.00/README/usr/share/doc/tesseract-3.04.00/eurotext.tif/usr/share/doc/tesseract-3.04.00/phototest.tif/usr/share/licenses/tesseract-3.04.00/usr/share/licenses/tesseract-3.04.00/COPYING/usr/share/man/man1/ambiguous_words.1.gz/usr/share/man/man1/cntraining.1.gz/usr/share/man/man1/combine_tessdata.1.gz/usr/share/man/man1/dawg2wordlist.1.gz/usr/share/man/man1/mftraining.1.gz/usr/share/man/man1/shapeclustering.1.gz/usr/share/man/man1/tesseract.1.gz/usr/share/man/man1/unicharset_extractor.1.gz/usr/share/man/man1/wordlist2dawg.1.gz/usr/share/man/man5/unicharambigs.5.gz/usr/share/man/man5/unicharset.5.gz/usr/share/tesseract/usr/share/tesseract/tessdata/usr/share/tesseract/tessdata/configs/usr/share/tesseract/tessdata/configs/ambigs.train/usr/share/tesseract/tessdata/configs/api_config/usr/share/tesseract/tessdata/configs/bigram/usr/share/tesseract/tessdata/configs/box.train/usr/share/tesseract/tessdata/configs/box.train.stderr/usr/share/tesseract/tessdata/configs/digits/usr/share/tesseract/tessdata/configs/hocr/usr/share/tesseract/tessdata/configs/inter/usr/share/tesseract/tessdata/configs/kannada/usr/share/tesseract/tessdata/configs/linebox/usr/share/tesseract/tessdata/configs/logfile/usr/share/tesseract/tessdata/configs/makebox/usr/share/tesseract/tessdata/configs/pdf/usr/share/tesseract/tessdata/configs/quiet/usr/share/tesseract/tessdata/configs/rebox/usr/share/tesseract/tessdata/configs/strokewidth/usr/share/tesseract/tessdata/configs/unlv/usr/share/tesseract/tessdata/eng.cube.bigrams/usr/share/tesseract/tessdata/eng.cube.fold/usr/share/tesseract/tessdata/eng.cube.lm/usr/share/tesseract/tessdata/eng.cube.nn/usr/share/tesseract/tessdata/eng.cube.params/usr/share/tesseract/tessdata/eng.cube.size/usr/share/tesseract/tessdata/eng.cube.word-freq/usr/share/tesseract/tessdata/eng.tesseract_cube.nn/usr/share/tesseract/tessdata/eng.traineddata/usr/share/tesseract/tessdata/pdf.ttf/usr/share/tesseract/tessdata/tessconfigs/usr/share/tesseract/tessdata/tessconfigs/batch/usr/share/tesseract/tessdata/tessconfigs/batch.nochop/usr/share/tesseract/tessdata/tessconfigs/matdemo/usr/share/tesseract/tessdata/tessconfigs/msdemo/usr/share/tesseract/tessdata/tessconfigs/nobatch/usr/share/tesseract/tessdata/tessconfigs/segdemo

查看.so文件接口

    nm -D xxx.so