Pixel rounding method and circuit for use in a raster scan displ

Details Pixel rounding method and circuit for use in a raster scan displ Pixel rounding method and circuit for use in a raster scan displ

1986-05-05

1989-01-03

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340728, 340748, G09G 116

Patent

active

047960167

ABSTRACT:
A pixel rounding method and circuit for bit-map graphics displays. The pixel codes are divided into two groups "high" and "low", and pixels with "high" groups codes are rounded against pixels with "low" group codes. The rounding can be prerounding or postrounding and involves extending a rounded pixel partway into the adjacent (preceding or succeeding) pixel position. Rounding decisions are made by detecting diagonal relationships of "high" and "low" group codes in blocks in four pixel codes. A rounding circuit receives a pixel code stream and produces a version thereof which is delayed by one pixel period. In accordance with the rounding decisions, the original and delayed pixel code streams are selectively switched each half pixel period to provide a resultant pixel code stream which is used to generate the display.

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patent: 4215414 (1980-07-01), Huelsman
patent: 4239459 (1980-12-01), Houldsworth
patent: 4649380 (1987-03-01), Penna

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