Unable to extract scanned pdf using TesseractOCRCo

问题:

My pdf contains scanned images and I want to extract text from it.

What I tried : I tried with AutoDetectParsers but no output.

I followed the solution provided in Apache Tika extract scanned PDF files and also Apache Tika Jira at https://issues.apache.org/jira/browse/TIKA-1729 but getting empty string without any error.

My configuration : Win 7 64-bit OS, JDK 1.8.0_45.

Any kind of help is welcome.

回答1:

Steps to follow to solve this :

1. Install Tesseract in your system using 'tesseract-ocr-setup-3.05.00dev.exe' for Windows from: https://sourceforge.net/projects/tesseract-ocr-alt/files/ and set its location in your config.

   Java code :

   Parser parser = new AutoDetectParser();
   BodyContentHandler handler = new BodyContentHandler(Integer.MAX_VALUE);
   TesseractOCRConfig config = new TesseractOCRConfig();
   config.setTesseractPath(tPath);
   PDFParserConfig pdfConfig = new PDFParserConfig();
   pdfConfig.setExtractInlineImages(true);
   pdfConfig.setExtractUniqueInlineImagesOnly(false); // set to false if pdf contains multiple images.
   ParseContext parseContext = new ParseContext();
   parseContext.set(TesseractOCRConfig.class, config);
   parseContext.set(PDFParserConfig.class, pdfConfig);
   //need to add this to make sure recursive parsing happens!
   parseContext.set(Parser.class, parser);
   

2. Maven dependencies :

<dependencies> <dependency> <groupId>org.apache.tika</groupId> <artifactId>tika-parsers</artifactId> <version>1.13</version> </dependency> <dependency> <groupId>com.levigo.jbig2</groupId> <artifactId>levigo-jbig2-imageio</artifactId> <version>1.6.5</version> </dependency> <dependency> <groupId>com.github.jai-imageio</groupId> <artifactId>jai-imageio-core</artifactId> <version>1.3.1</version> </dependency> </dependencies>

I think it may be helpful. Thanks.