Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-04-08
1987-07-21
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 22, H04N 5262
Patent
active
046822275
ABSTRACT:
A video signal processing apparatus comprises an input (1) for receiving an input video signal and an output (2) at which the processed signal is produced. The apparatus includes a vertical filter (3), a horizontal filter (4), a vertical interpolator (5) a horizontal interpolator (6), and a field store (7) arranged in cascade. The cut-off frequencies of the vertical and horizontal filters (3,4) are adjustable by means of signals passed over paths (18 and 19) from the control circuit (8) to the filters (3,4). A control apparatus comprising a potentiometer (25), a switch (23), and an analogue to digital converter (26) produces signals which are passed over a path (24) to the control circuit (8). These signals are used to cause the control circuit (8) to produce signals over paths (18,19) to the filters (3,4) which reduce the cut-off frequencies of the filters to a value which is below that appropriate to the picture size. This produces a soft focus effect.
REFERENCES:
patent: 4163249 (1979-07-01), Michael et al.
patent: 4282546 (1981-08-01), Reitmeier
patent: 4422095 (1983-12-01), Hosoya
patent: 4538178 (1985-08-01), Bolger
Briody Thomas A.
Gadson Gregory P.
Shepperd John W.
Streeter William J.
U.S. Philips Corporation
LandOfFree
Digital video signal processing apparatus for providing zoom and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital video signal processing apparatus for providing zoom and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital video signal processing apparatus for providing zoom and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-211419