def __init__(self, node):
super(DetectCenterState, self).__init__(node)
self._x = 0
self._y = 0
self._z = 0
self._centered = False
self.bt = BlockTracker()
def __init__(self, node):
super(DetectEstimateState, self).__init__(node)
self.bt = BlockTracker()
self._ready = False
self._block_centered = False
self._got_image = False
self._z = None
