title: tensorflow Object detection, Bounding Boxes are not visible on the own dataset
body: <p>I am trying the run the TF object detection locally on my own dataset. Every step is happening perfectly except the Visualization of the BB on a test image.
  First I have run the Pascal VOC dataset on the Faster R-CNN Inception ResNet v2, modified the scripts as per the VOC dataset and Then followed the instructions from G3doc, everything worked perfectly, for the visualization, I am using the ipython jupyter notebook given in the objection detection. The visualization was awesome.
  Then I tried to do the same for my own dataset. Repeated all the steps same but no BB is showing on the image.</p>
  
  <p>Can someone help what might be going wrong?</p>
  
  <p>P.S. I am using ubuntu 16.04, 64GB ram system.</p>