Halo generator for CRT display symbols

Details Halo generator for CRT display symbols Halo generator for CRT display symbols

1983-11-18

1986-02-11

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 5272

Patent

active

045701822

ABSTRACT:
An apparatus for generating halos about CRT display symbols, to distinguish them from background video, reads, from an image memory, video Bit signals corresponding to a CRT picture element P.sub.I,J, and the immediately surrounding CRT picture elements. A digital signal is generated therefrom representing a first Boolean Function. The intensity of the background illumination at P.sub.I,J, is unaltered, in response to a digital signal of zero, and is diminished by one-half, in response to a digital signal of one.

REFERENCES:
patent: 3878327 (1975-04-01), Uhler
patent: 4354186 (1982-10-01), Groothuis

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