EP 0448803 B1 19940309 - Video control system.
Title (en)
Video control system.
Title (de)
Videokontroll-Einrichtung.
Title (fr)
Système de commande d'affichage vidéo.
Publication
Application
Priority
DE 4009912 A 19900328
Abstract (en)
[origin: EP0448803A2] Infrared light barriers or video control systems are used, as is known, in monitoring bounded, plane areas, for example a level crossing. However, both solutions have the disadvantage that they are unreliable or are of a very complicated design. The invention provides a video control system which permits reliable evaluation using simple means. For this purpose, a camera is used to take and store two fields in each case, one being taken without flash, and the other with. A differential image, now containing only signal components caused by the light of the flash is obtained from the two fields. Given the presence of a three-dimensional object in the monitored area, there is produced on the side of the object averted from the flash a shadow signal which is evaluated and, if necessary, fed to the alarm-triggering device. <IMAGE>
IPC 1-7
IPC 8 full level
G08B 13/196 (2006.01)
CPC (source: EP)
G08B 13/19634 (2013.01); G08B 13/19652 (2013.01)
Designated contracting state (EPC)
AT CH DE DK FR GB IT LI
DOCDB simple family (publication)
EP 0448803 A2 19911002; EP 0448803 A3 19920923; EP 0448803 B1 19940309; AT E102726 T1 19940315; DE 4009912 A1 19911002; DE 59004935 D1 19940414
DOCDB simple family (application)
EP 90124078 A 19901213; AT 90124078 T 19901213; DE 4009912 A 19900328; DE 59004935 T 19901213