Digital .rho.-.theta. to XY scan converter for use with limited

Details Digital .rho.-.theta. to XY scan converter for use with limited Digital .rho.-.theta. to XY scan converter for use with limited

1977-05-20

1979-04-10

Gruber, Felix D.

Boots, shoes, and leggings

358140, 343 5SC, 364731, H04N 502

Patent

active

041492528

ABSTRACT:
In a non-storage CRT display system having a reiteration memory wherein video information is received in a .rho..theta. coordinate system and displayed on an XY raster the input coordinates are transformed as received digitized video information is transferred from an input buffer to the reiteration memory so that information previously stored in .rho..theta. format in the input buffer is subsequently stored in an XY format in the reiteration memory. The coordinate transformation is accomplished by calculating, at the completion of the read-out for display of a given horizontal line of data, the X and .rho. addresses of the reiteration memory cells to be up-dated from the input buffer during read-out of the subsequent horizontal line of data read-out. When the calculated X and horizontal X addresses correspond the reiteration memory is up-dated with calculated .rho. values.

REFERENCES:
patent: 3147474 (1964-09-01), Kliman
patent: 3673323 (1972-06-01), Gustafson
patent: 3765018 (1973-10-01), Heard et al.
patent: 3792194 (1974-02-01), Wood et al.
patent: 3827027 (1974-07-01), Towson et al.
patent: 3904817 (1975-09-01), Hoffman et al.
patent: 4002827 (1977-01-01), Nevin et al.
patent: 4065770 (1977-12-01), Berry
Compendum of Visual Displays: Rome Air Development Center, R & Tech. Division Document, pp. IX-XII (introduction) Mar. 1967.
IBM Tech. Disclosure Bulletin: Radar Digital Scan Converter by L.B.Ii, vol. 17, No. 6, Nov. 1974, pp. 1677-1679.

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