Image processing apparatus and method that adds correction signa

Details Image processing apparatus and method that adds correction signa Image processing apparatus and method that adds correction signa

1994-06-28

1997-03-11

Boudreau, Leo

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

358457, 358466, G06K 936

Patent

active

056109997

ABSTRACT:
There is disclosed a method for converting multi-level image data into binary image data and an apparatus therefor. An average density is calculated from the already binarized density of pixels positioned in a predetermined area around an object pixel, and the threshold value for binarization is set by adding a fixed bias value and varying dither signals to the average density, and the error generated in the binarization is distributed to the unbinarized pixels positioned behind. The addition of the fixed bias prevents formation of a spot-free white area in the vicinity of an edge or in the initial stage of processing, and the addition of dither signals prevents texture formation in the low density area.

REFERENCES:
patent: 4339774 (1982-07-01), Temple
patent: 4562486 (1985-12-01), Suzuki et al.
patent: 4760460 (1988-07-01), Shimotohno
patent: 4853792 (1989-08-01), Katsuta et al.
patent: 4878125 (1989-10-01), Katayama et al.
patent: 4924322 (1990-05-01), Kurosawa et al.
patent: 4955065 (1990-09-01), Ulichney
patent: 4958238 (1990-09-01), Katayama et al.
patent: 5016118 (1991-05-01), Nannichi
patent: 5053887 (1991-10-01), Thompson
patent: 5086484 (1992-02-01), Katayama et al.
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5153925 (1992-10-01), Tanioka et al.
patent: 5208873 (1993-05-01), Nakajima
patent: 5278672 (1994-01-01), Shimazaki
Patent Abstracts Of Japan, vol. 14, No. 22, Jan. 17, 1990, abstract for Japanese 01-264071, Oct. 1989.

Affiliated with

Also associated with

Rating

Image processing apparatus and method that adds correction signa does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image processing apparatus and method that adds correction signa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image processing apparatus and method that adds correction signa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-450302