| 摘要 |
<p>The present invention relates to a method for monitoring the accessibility of an emergency exit, the method comprising illuminating an area in front of the emergency exit by emitting light, detecting reflected light from the illuminated area using an image sensor, calculating a plurality of distances based on said detected reflected light for discrete positions in said image sensor, comparing said each of said plurality of distances with a predetermined distance, and generating an alarm signal if said comparing indicates a substantial difference in distance in at least one position in said image sensor. The present invention also relates to a system and a device for monitoring the accessibility of an emergency exit.</p> |
