code: def create_visual_input(camera_parameters, name):
          
          o_size_h = camera_parameters['height']
          o_size_w = camera_parameters['width']
          bw = camera_parameters['blackAndWhite']
  
          if bw:
              c_channels = 1
          else:
              c_channels = 3
  
          visual_in = tf.placeholder(shape=[None, o_size_h, o_size_w, c_channels], dtype=tf.float32,
                                     name=name)
          return visual_in
docs: Creates image input op.
          :param camera_parameters: Parameters for visual observation from BrainInfo.
          :param name: Desired name of input op.
          :return: input op.