AssertionError assert(image_height >= shape[0]) in demo.py

[tombenj]

@MarvinTeichmann Tried multiple images with different file types but only the demo images work. All other images get the following error:

2018-08-12 18:54:03,523 INFO /data/cvfs/mttt2/RUNS/ICCV/MultiNet/multinet_trained/model.ckpt-99999
2018-08-12 18:54:03,524 INFO Restoring parameters from RUNS/MultiNet_ICCV/model.ckpt-99999
2018-08-12 18:54:03.683228: W tensorflow/core/framework/allocator.cc:108] Allocation of 411041792 exceeds 10% of system memory.
2018-08-12 18:54:04.106021: W tensorflow/core/framework/allocator.cc:108] Allocation of 411041792 exceeds 10% of system memory.
Traceback (most recent call last):
  File "demo.py", line 426, in <module>
    tf.app.run()
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/platform/app.py", line 125, in run
    _sys.exit(main(argv))
  File "demo.py", line 340, in main
    assert(image_height >= shape[0])
AssertionError