Calculation of radial coordinates of polar-coordinate raster sca

Details Calculation of radial coordinates of polar-coordinate raster sca Calculation of radial coordinates of polar-coordinate raster sca

1981-08-31

1983-11-15

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, 340727, 364731, H04N 502, H04N 514, G09G 116

Patent

active

044159285

ABSTRACT:
The calculation of r.sup.2 =x.sup.2 +y.sup.2, where x and y are the Cartesian coordinates of a raster-scanned space, is carried forward by accumulation of 2x+1 and 2y+1 terms. A read-only memory can then be used for table look-up of r, the radial coordinate of raster scan in polar coordinates.

REFERENCES:
patent: 3836812 (1974-09-01), Bennett
patent: 3917935 (1975-11-01), Lazecki
patent: 3947667 (1976-03-01), Parker
patent: 4002827 (1977-01-01), Nevin et al.
patent: 4065770 (1977-12-01), Berry
patent: 4106021 (1978-08-01), Katagi
patent: 4149252 (1979-04-01), Miller, Jr.
patent: 4220969 (1980-09-01), Nitadori
patent: 4275415 (1981-06-01), Engle
Hemel, "Making Small ROM's Do Math Quickly, Cheaply and Easily," Electronics, May 11, 1970, pp. 104-111.

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