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公开(公告)号：DE69021661D1
公开(公告)日：1995-09-21
申请号：DE69021661
申请日：1990-06-05
Applicant: IBM
Inventor： BENNETT WILLIAM EDWARD , BOIES STEPHEN JOY , DAVIES ANTHONY ROBIN , ETZOLD KARL-FRIEDRICH , RODGERS TODD KANNER
Abstract: A stylus and tablet X-Y data input system for a video display system. The pen comprises an optical stylus having suitable pickup means and the tablet is passive in nature and provides direct digitized data readout. Absolute positional information is encoded in binary form in the tablet in such a fashion that the pen position upon the tablet is automatically determinable by illuminating a particular area of the tablet and reading off the digitized X-Y coordinate data stored therein. The pen and supporting hardware/software are rotationally insensitive so that the pen may be held in any desired position comfortable to a user. The system provides greatly improved resolution, sampling rate accuracy and general robustness particularly for such applications as text recognition as well as a wide variety of other graphical input uses.
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公开(公告)号：DE69021661T2
公开(公告)日：1996-04-18
申请号：DE69021661
申请日：1990-06-05
Applicant: IBM
Inventor： BENNETT WILLIAM EDWARD , BOIES STEPHEN JOY , DAVIES ANTHONY ROBIN , ETZOLD KARL-FRIEDRICH , RODGERS TODD KANNER
Abstract: A stylus and tablet X-Y data input system for a video display system. The pen comprises an optical stylus having suitable pickup means and the tablet is passive in nature and provides direct digitized data readout. Absolute positional information is encoded in binary form in the tablet in such a fashion that the pen position upon the tablet is automatically determinable by illuminating a particular area of the tablet and reading off the digitized X-Y coordinate data stored therein. The pen and supporting hardware/software are rotationally insensitive so that the pen may be held in any desired position comfortable to a user. The system provides greatly improved resolution, sampling rate accuracy and general robustness particularly for such applications as text recognition as well as a wide variety of other graphical input uses.
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公开(公告)号：DE68915232T2
公开(公告)日：1994-11-10
申请号：DE68915232
申请日：1989-09-02
Applicant: IBM
Inventor： LARKY STEVEN PHILIP , LUCAS BRUCE DAVID , MCCABE DANIEL HELMUT , RODGERS TODD KANNER
Abstract: A color display device which includes dither apparatus for each primary color to be displayed. A dither matrix provides a dither signal output as a function of the position of a pixel on the color display device. An input primary color signal includes an integer signal and a fraction signal. The integer signal is incremented by an incrementer. There is means for providing an output primary color signal which is the incremented signal whenever a predetermined relationship exists between the dither signal and the fraction signal, and which is the integer signal whenever the predetermined relationship does not exist.
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公开(公告)号：DE68915232D1
公开(公告)日：1994-06-16
申请号：DE68915232
申请日：1989-09-02
Applicant: IBM
Inventor： LARKY STEVEN PHILIP , LUCAS BRUCE DAVID , MCCABE DANIEL HELMUT , RODGERS TODD KANNER
Abstract: A color display device which includes dither apparatus for each primary color to be displayed. A dither matrix provides a dither signal output as a function of the position of a pixel on the color display device. An input primary color signal includes an integer signal and a fraction signal. The integer signal is incremented by an incrementer. There is means for providing an output primary color signal which is the incremented signal whenever a predetermined relationship exists between the dither signal and the fraction signal, and which is the integer signal whenever the predetermined relationship does not exist.
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