Window-relative dither circuit

Details Window-relative dither circuit Window-relative dither circuit

Filed on

1991-03-15

Date issued

1994-04-05

Examiner

Nguyen, Phu K.

Other Related Categories

395157, 395162, G06F 1562

Type

Patent

Status

active

Patent number

053012690

Description

ABSTRACT:
A circuit for performing window-relative dithering of intensity data comprises a programmable dither cell; circuitry for comparing dither values stored in the dither cell with selected parts of the intensity values and outputting an increment signal in accordance with the results of the comparison; a wrap prevention circuit for preventing the intensity from being incremented if incrementing would cause the intensity to wrap to a low value; and an adder for incrementing the intensity in response to the increment signal, provided it is not inhibited by the wrap prevention circuit. The dither circuit may be advantageously employed in a computer graphics system to dither pixel intensity values.

REFERENCES:
patent: 4920571 (1990-09-01), Abe et al.
patent: 5001767 (1991-03-01), Yoneda et al.
patent: 5077678 (1991-12-01), Guttag et al.

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