Feature request random rotating object_detection API

System information

• What is the top-level directory of the model you are using: object_detection
• Have I written custom code (as opposed to using a stock example script provided in TensorFlow):
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 16.04
• TensorFlow installed from (source or binary): source
• TensorFlow version (use command below): 1.3.0
• Bazel version (if compiling from source): 0.5.2

Situation:
I'm using the object detection API to detect features on images. The problem I work on is not focused on photograph but on more structural images. My training set now contains around 500 images. The accuracy has increased a lot since I added some data augmentation options.

The results I see so far are promising. For the same boxes with a horizontal feature it is working perfect. For the same box vertical it is failing. My training set contains them both.

Feature request:
I was wondering if it can be improved by randomly rotating the input images to fix some of the not detected vertical aligned boxes. Currently this preprocessing option does not exist in object_detection. Do you think adding an preprocessor feature for random rotation is helpful (is a PR useful)?