title: Google Cloud Vision API DOCUMENT_TEXT_DETECTION returning incorrect bounding box
body: <p>I'm using the "DOCUMENT_TEXT_DETECTION" option from the Google Cloud Vision API.</p>
  
  <p>It seems that it's returning correct text value, but incorrect coordinates bounding box.</p>
  
  <p>Why this problem occurred?</p>
  
  <p>Thank you.</p>
  
  <h2>raw picture</h2>
  
  <p><a href="https://i.stack.imgur.com/mS1VK.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/mS1VK.jpg" alt="enter image description here"></a></p>
  
  <h2>draw bounding box picture</h2>
  
  <p><a href="https://i.stack.imgur.com/p2YFr.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/p2YFr.jpg" alt="enter image description here"></a></p>
  
  <h2>returning <a href="https://gist.githubusercontent.com/namagon/03559df48688822e891c2f7e74220f0f/raw/e96eb45916a76fbb2ecc132735cfd7563ea7246c/gistfile1.txt" rel="noreferrer">json</a></h2>
  
  <hr>
  
  <h1>appendix</h1>
  
  <h2>draw bounding box words and overall</h2>
  
  <p><a href="https://i.stack.imgur.com/ItXPU.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ItXPU.jpg" alt="enter image description here"></a></p>