Method and apparatus for generating halftone image considering s

Details Method and apparatus for generating halftone image considering s Method and apparatus for generating halftone image considering s

1995-03-10

1998-02-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, H04N 1387

Patent

active

057216258

ABSTRACT:
The present invention is to generate a binary halftone image by taking full advantage of high resolution dots and low resolution dots. A Laplacian filter is applied to the density data of an original image to determine filtered density data representing spatial frequencies of the original image. A dot selection signal SEL for selecting one of the high resolution dots and the low resolution dots is generated based on a comparison between the filtered density data and a threshold data. A dot generator 32 includes a first SPM 48 for storing a threshold pattern of the low resolution dots and a second SPM 50 for storing a threshold pattern of the high resolution dots. A selector 52 receives threshold data DTH1 and DTH2 output from the first and the second SPMs 48 and 50 and selects one of the threshold data DTH1 and DTH2 in response to the dot selection signal SEL. A comparator 54 compares image data D.sub.IM with the selected threshold data and generates a dot signal Sd to record a binary halftone image.

REFERENCES:
patent: 4414581 (1983-11-01), Kato et al.
patent: 4595956 (1986-06-01), Kawamura et al.
patent: 5111310 (1992-05-01), Parker et al.
patent: 5198910 (1993-03-01), Ng et al.
Kwan Y. Wong et al., "Adaptive Switching of Dispersed and Clustered Halftone Patterns for Bi-Level Image Rendition", 1977 SID International Symposium, Digest of Technical Papers; Society for Information Display pp. 124 and 125.

Affiliated with

Also associated with

Rating

Method and apparatus for generating halftone image considering s does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for generating halftone image considering s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for generating halftone image considering s will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1878148