Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-03-17
1979-07-31
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358160, H04N 718, H04N 514
Patent
active
041632516
ABSTRACT:
The invention concerns an apparatus for the amplitude discrimination of a video signal of the kind wherein the video signal is applied to a window discriminator which is adapted to provide a binary signal during periods when the amplitude of the video signal lies in a predetermined sub-range of the total amplitude range of the video signal.
In order to avoid the presence in the binary signal of transient pulses which result from the slow rise time of the video signal when the latter effects a transition across an edge between an area of picture with the video signal amplitude below the said sub-range and an area of picture with a video signal amplitude above the sub-range, second and third binary signals are produced when the amplitude of the video signal lies above and below the sub-range respectively. The three binary signals are analysed in two dimensions so as to detect the presence of edges in the picture represented by the video signal, and when such an edge is detected the first mentioned binary signal is suppressed so that the undesired transient pulses do not occur.
REFERENCES:
patent: 3674926 (1972-07-01), Dewey et al.
patent: 3809926 (1974-05-01), Young
patent: 3963983 (1976-06-01), Hogg
patent: 3991376 (1976-11-01), Stevens
patent: 4030119 (1977-06-01), Ellis
patent: 4125858 (1978-11-01), Hounsfield et al.
Gerasimow Alexander
Martin John C.
Robert & Bosch GmbH
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