Add some useful functions

[ductranit]

There are 5 extend functions in base api: GetBoxText, GetHOCRText, SetInputName, SetOutputName, ReadConfigFile

Here is the example for new apis:

     TessBaseAPI baseApi = new TessBaseAPI();
     // use the most accuracy mode.
     baseApi.init(appPath, "eng", TessBaseAPI.OEM_TESSERACT_CUBE_COMBINED);

     // set config output hocr
     baseApi.setVariable("tessedit_create_hocr", "1");
     baseApi.setImage(new File(grayScaleFileName));

     // set the filename for hocr output
     baseApi.setInputName("hocr.html");

     String hocr = baseApi.getHOCRText(0);
     String recognizedText = baseApi.getUTF8Text();
     String boxText = baseApi.getBoxText(0);

This is the input ocr image:

And the results:

• Raw text
• Hocr output
• Box text

For the Page Iterator, I created test case base on tesseract 's document

     ResultIterator iterator = baseApi.getResultIterator();
        int level = PageIteratorLevel.RIL_WORD;
        if(iterator != null){       
        do{
            String dataText = iterator.getUTF8Text(level);
            float confident = iterator.confidence(level);
            if(!TextUtils.isEmpty(dataText)){
                int[] box = iterator.getBoundingBox(level);
                System.out.println(box);
            }       
        }while(iterator.next(level));
            iterator = null;
        } 

[rmtheis]

Outstanding--this is a great contribution. Thank you.