H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/3
H04N 5/14 (2006.01) G08B 13/18 (2006.01) G08B 13/194 (2006.01)
Patent
CA 1299733
ABSTRACT OF THE DISCLOSURE The invention relates to a device for controlling the presence of information concerning images in video signals applicable to a video receiver. The device includes means to detect a predetermined row line with respect to a first line of an image, means to cut this line between two successive instants, and means in order to determine and count transitions characteristic of luminance for a predetermined row line between the successive instants. An alarm is triggered or set off by counting means when the number of transitions reaches a threshold not to be exceeded. Application for detecting a test card, for monitoring premises, etc.
580072
Gay Gerard Jean
Goudreau Gage Dubuc
LandOfFree
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