title: Google API OCR Language Hint
body: <p>I am using the Googel Vision API to detect English.
  However, Korean cannot be detected.
  I am using bitmap image for recognition. It is source.</p>
  
  <p>TextRecognizer textRecognizer = new TextRecognizer.Builder (this) .build ();
  Frame imageFrame = new Frame.Builder ()
     .setBitmap (bitmap)
                  .build ();
  SparseArray  textBlocks = textRecognizer.detect (imageFrame);</p>
  
  <p>In the case of Google Vision API, if  use Language Hint,  need to communicate (json) with Google Cloud ??? </p>