Computer graphics processing and selective visual display system – Display peripheral interface input device – Stylus
Patent
1992-04-06
1994-08-23
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Stylus
345156, G09G 302
Patent
active
053411552
ABSTRACT:
In a large area display system, multiple persons may work together with multiple input devices for supplying and receiving information in an interactive system with a single large area display. The large area display system comprises a screen wherein computer generated information is projected upon one side of the screen, and users interact with the computer from the opposite side of the the screen. Data coordinates for an input device corresponding to a pseudo image sensed by the receiving subsystem electronics are provided to the controlling computer. The input data coordinates from the pseudo image are normalized for variations due to frequency dependence and electronic drift. The normalized data coordinates are looked up in a calibration table to account for distortion in the pseudo image detection electronics. Screen coordinates corresponding to pixel locations on the large area screen are found by interpolation from the data From the calibration table. The calibration table is prepared off-line, based on a bicubic spline interpolating function which is then compressed using a delta compression scheme. During on-line operation of the system, screen coordinates are looked-up directly from the compressed table. The screen coordinates are then jitter smoothed to provide a smooth path of response closely conforming to original input locations. The jitter smoothing method uses an exponential function based on the magnitude of the change in the position of the input.
REFERENCES:
patent: 3885096 (1975-05-01), Inuiya
patent: 4295198 (1981-10-01), Copeland et al.
patent: 4456787 (1984-06-01), Schlosser et al.
patent: 4514688 (1985-04-01), Whetstone
patent: 4575581 (1986-03-01), Langberg
patent: 4650926 (1987-03-01), Nakamura et al.
patent: 4678869 (1987-07-01), Kable
patent: 4679241 (1987-07-01), Lukis
patent: 4737773 (1988-04-01), Kobayashi
Elrod Scott A.
Goldberg David
Welch Brent B.
Chow Doon
Jacobs R. Christine
Weldon Ulysses
Xerox Corporation
LandOfFree
Method for correction of position location indicator for a large does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for correction of position location indicator for a large, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for correction of position location indicator for a large will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-505886