Method and apparatus for generating simultaneously derived corre

Details Method and apparatus for generating simultaneously derived corre Method and apparatus for generating simultaneously derived corre

1992-03-10

1998-05-19

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358458, H04N 140

Patent

active

057543119

ABSTRACT:
Method and apparatus for generating a halftone image. An ensemble of correlated minimum visual modulation two-dimensional binary patterns are provided. Each pattern corresponds to one density level of a digital input signal. The set of patterns is generated simultaneously to minimize an ensemble cost function which is the variance of non-zero spatial frequencies weighted by a human visual system modulation transfer function. The patterns are then modularly addressed to select bits to form halftone pattern.

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