Station platform observation method

• US 4,807,027 A
• Filed: 01/07/1988
• Issued: 02/21/1989
• Est. Priority Date: 02/27/1985
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Muto, Takao
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Kostak, Victor R.
• Application Number:
  US07/143,235
• Time in Patent Office: 411 Days
• Field of Search: 358/108, 358/105, 358/109, 358/125, 358/126, 246/167 R, 246/125, 104/27, 104/28, 105/341, 340/571
• US Class Current: 348/148
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

A train platform observation method in which the platform is continuously observed by a television camera and the output of the camera is displayed on a television monitor. First scene data outputted by the camera is compared with later-outputted second scene data, and variations therebetween are detected. When the level of the detected variations exceed a predetermined level, an indication is given to the operator that a dangerous condition exists and a signal is produced which prevents the train from departing the platform. An indication may also be produced on the monitor to indicate to the operator where the dangerous condition is present.

Claims

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.

2. A station platform observation method as set forth in claim 1, further comprising generating a signal in said area discriminating unit indicative of the location of the variation in scenery within said monitored area and applying said signal to said monitor to provide a mark on the screen of said monitor indicative of the location.