Image processing device with error-diffusion quantization functi

Details Image processing device with error-diffusion quantization functi Image processing device with error-diffusion quantization functi

1995-09-28

1998-10-20

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358465, 358466, 382270, 382274, H04N 140

Patent

active

058255095

ABSTRACT:
An error-diffusion quantization process is conducted on all the pixels of a continuous tone image, pixel by pixel. In the error-diffusion quantization process to an object pixel, a threshold value T is randomly set for the object pixel. Input density data I.sub.x,y of the object pixel is modified by a sum of quantization errors E distributed to the object pixel during error-diffusion quantization processes previously performed for preceding nearby pixels. The modified input density I'.sub.x,y of the object pixel is compared with the threshold value T set for the object pixel, whereby the input density data of the object pixel is converted into a quantized output data Ie. A quantization error "e" between the modified input density I'.sub.x,y and the quantized output data Ie is determined. The quantization error "e" is distributed to subsequent nearby pixels, which have not yet been quantized, with the use of the weight coefficient matrix .alpha..

REFERENCES:
patent: 4680645 (1987-07-01), Dispoto et al.
patent: 4809082 (1989-02-01), Yamaguchi et al.
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5204760 (1993-04-01), Murayama et al.
patent: 5216753 (1993-06-01), Ng
patent: 5325211 (1994-06-01), Eschbach
patent: 5394250 (1995-02-01), Shono
patent: 5402245 (1995-03-01), Motta et al.
patent: 5515456 (1996-05-01), Ballard
patent: 5519509 (1996-05-01), Hikosaka et al.
patent: 5539843 (1996-07-01), Murakami et al.
patent: 5610999 (1997-03-01), Bannai et al.
IEEE Spectrum, Bell Telephone Laboratories, Inc., Mar. 1969, "Images from computers", Schroeder, pp. 67-79.
Computer Graphics and Image Processing 5, 13-40 (1976), Bell Laboratories, New Jersey, US, "A survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays", J>F Jarvis et al., pp. 13-40.
"Graduation Processing", Basics of Imaging Technology, (1991).
Robert W. Floyd, et al, "An Adaptive Algorithm for Spatial Greyscale", Proceeding of the S.I.D. vol. 17/2 Second Quarter (1976) pp. 75-76.
"Dithering Method" Electronic Image Association Report, vol. 10, No. 5 (1981), pp. 388-397.

Affiliated with

Also associated with

Rating

Image processing device with error-diffusion quantization functi 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 device with error-diffusion quantization functi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image processing device with error-diffusion quantization functi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-250849