Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-01-06
1993-09-28
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 12, 358180, H04N 704, H04N 1106, H04N 3223
Patent
active
052490491
ABSTRACT:
A video display control system, comprises a video display having a first format display ratio. A picture height circuit determines an active video picture height from an input video signal having a second format display ratio. A detector circuit identifies letterbox formats responsive to the active video picture height in the video signal and determines a format display ratio of the letterbox picture. A zoom control circuit is operable in a first mode of operation for enlarging the picture in size to fill the display substantially entirely, notwithstanding consequent cropping of the picture, and operable in a second mode of operation for enlarging the picture in size to substantially fill the display vertically, notwithstanding consequent unused portions of the display. A vertical pan control circuit automatically centers the picture in both modes of operation. The detector can identify the format display ratio of the letterbox format picture a circuit responsive to the identified format display ratio controls image aspect ratio distortion of the enlarged picture. A deflection system is controllable in vertical size by a variable vertical scan rate, in horizontal size by variable horizontal video expansion and compression, and in pan position by varying the vertical reset in phase.
REFERENCES:
patent: 4670784 (1987-06-01), Goldberg
patent: 4679091 (1987-07-01), Kikuchi et al.
patent: 4760455 (1988-07-01), Nagashima
patent: 4761587 (1988-08-01), Wharton
patent: 4766355 (1988-08-01), Kadlec et al.
patent: 4769705 (1988-09-01), Lendaro
patent: 5032907 (1991-07-01), Isnardi
patent: 5097332 (1992-03-01), Faroudja
patent: 5136398 (1992-08-01), Rodriguez-Cavazos et al.
Kranawetter Greg A.
Saeger Timothy W.
Willis Donald H.
Fried Harvey D.
Laks Joseph J.
Peng John K.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
LandOfFree
Managing letterbox displays does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Managing letterbox displays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Managing letterbox displays will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2193905