title: Recognize empty space in shelves by tensorflow object detection
body: <p>I am new in machine learning, I use tensorflow object detection from <a href="https://github.com/tensorflow/models/tree/master/research/object_detection" rel="nofollow noreferrer">https://github.com/tensorflow/models/tree/master/research/object_detection</a> ,
  I use ssd_mobilenet_v1_coco and I create dataset of 100 images of Cooler
   I have trained a model to detect two bottle images kept in cooler, </p>
  
  <p>here is the screenshots 
  <img src="https://i.stack.imgur.com/jjJl3.png" alt="imgCooler1">
  <img src="https://i.stack.imgur.com/I2mrW.png" alt="imgCooler2"></p>
  
  <p>see at imgCooler1, 2nd row of cooler, there is some empty space, i want to recognize that empty space of Cooler, please suggest some solutions for this</p>