Station platform observation method

Claim 1

A station platform observation method in which a single television camera photographs the platform of a train station at which a train arrives and from which the train departs to produce scenery data of the platform and displays the scenery data on the screen of a television monitor, comprising: displaying first scenery data of the area between the platform and the train supplied by said television camera at the arrival and departure of said train on said monitor and storing said first scenery data in a memory for a predetermined period of time; comparing second scenery data supplied by said television camera later than said first scenery data with said first scenery data in a difference detection unit to detect differences between said first and second scenery data and provide a difference indicating signal; selecting a monitored area within said first scenery data and inputting area data indicative of the monitored area in an area storing unit; applying the difference indicating signal and said area data from said area storing unit to an area discriminating unit; determining whether the variation in scenery occurs within the monitored area and is greater than a predetermined value; and providing an indication to an operator that a dangerous condition exists and producing a signal for stopping said train.