title: Convert python opencv mat image to tensorflow image data
body: <p>I want to capture frames from a video with python and opencv and then classify the captured Mat images with tensorflow. The problem is that i don´t know how to convert de Mat format to a 3D Tensor variable. This is how i am doing now with tensorflow (loading the image from file) :</p>
  
  <pre><code>image_data = tf.gfile.FastGFile(imagePath, 'rb').read()
  with tf.Session() as sess:
      softmax_tensor = sess.graph.get_tensor_by_name('final_result:0')
      predictions = sess.run(softmax_tensor,
                             {'DecodeJpeg/contents:0': image_data})
  </code></pre>
  
  <p>I will appreciate any help, thanks in advance</p>