Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-10-13
1989-10-03
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358105, 34082565, H04N 718
Patent
active
048720534
ABSTRACT:
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 a line detector (3) to detect a predetermined row line with respect to a first line of an image, line cutting circuit (6) to cut this line between two successive instants (t2-t1), and a comparison circuit and counting circuit (8, 15) in order to determine and count transitions characteristic of luminance for a predetermined row line between the successive instants (t2-t1). An alarm (48) is triggered or set off by counting circuit (15) when the number of transitions reaches a threshold not to be exceeded. Application for detecting a test card, for monitoring premises, etc.
REFERENCES:
patent: 3531583 (1970-09-01), Kartchner
patent: 3641257 (1972-02-01), Taylor
patent: 3781468 (1973-12-01), Chomet et al.
patent: 3825676 (1974-07-01), Ramsden
patent: 3988533 (1976-10-01), Mick et al.
patent: 4198653 (1980-04-01), Kamin
The Journal Instruments & Experimental Techniques, vol. 28, No. 3, (May/Jun. 1985) "Television-Line Selector", by Venglyuk; pp. 621-622.
The Journal Proceedings of the 1979 Carnahan Conference on Crime Countermeasures (May 16-18 1979) "A Microcomputer-Based Video Detection System"; by Howington, pp. 127-132.
Parker Michael D.
Shepperd John W.
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