Telegraphy – Systems – Position coordinate determination for writing
Patent
1990-03-20
1991-06-25
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
382 59, 382 13, G08C 2100
Patent
active
050269534
ABSTRACT:
A scanner system with local scanning capability for graphic reading, which comprises a tablet, a scanner, a stylus or cursor control mouse and a main frame CPU. The scanner comprises a plurality of oscillators (induction coils) at both sides by the light source thereof to produce induced current on the plane of circuit of the tablet. The CPU of the tablet obtains the X,Y coordinate data of the oscillators through sample-and-hold amplifier circuit and A/D converter circuit. Simultaneously, the scanner projects light to reflect the picture to CCD so as to record the start and end location of every line. After a picture is read by the scanner the digital data of every line of the image and the X, Y coordinate data of the start and end location of every line of the image are stored in the storage of the main frame for further graphic data processing through its CPU so that any image distortion can be modified and local scanning can be achieved. The scanner is controlled to move by the tablet which provides a high resolution of 1000 lines per inch, such that the pitch between lines can be shortened, and a clear image can be obtained.
REFERENCES:
patent: 4581761 (1986-04-01), Ichinokawa et al.
Schreyer Stafford D.
Wintime Technology Inc.
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