code: @Override
      public String doOCR(List<IIOImage> imageList, Rectangle rect) throws TesseractException {
          return doOCR(imageList, null, rect);
      }
docs: Performs OCR operation.
  
  @param imageList a list of <code>IIOImage</code> objects
  @param rect the bounding rectangle defines the region of the image to be
  recognized. A rectangle of zero dimension or <code>null</code> indicates
  the whole image.
  @return the recognized text
  @throws TesseractException