在 Android 中使用 Tesseract 创建可搜索的 pdf

Question

I have been hired by my client to create an android application that would perform Ocr on an image using Tesseract to convert it into a searchable pdf.

Currently am able to extract text from images using this code;

  String extractText(String imagePath)
  {
  dataPath= Environment.getExternalStorageDirectory().toString() + "/Android/data/" + appContext.getPackageName() +  "/"; 
    File tessdata = new File(dataPath); 
   if (!tessdata.exists() || !tessdata.isDirectory())
   {
       throw new IllegalArgumentException("Data path must contain subfolder tessdata!");   
} 
     Bitmap image= BitmapFactory.decodeFile(imagePath);
  TessBaseAPI baseApi = new TessBaseAPI();
  baseApi.init(dataPath, "eng"); 

baseApi.setImage(image);
      String recognizedText = baseApi.getUTF8Text();
      baseApi.end();


      return recognizedText;
  }

The above code helps me get the text on the image accurately as a string, but I don't know how to create a searchable pdf with this text.

Answer 1

getUTF8Text returns only plain text. You'd need to use TessPDFRenderer API for PDF output.

https://github.com/tesseract-ocr/tesseract/tree/master/src/api