Method of processing image data

Details Method of processing image data Method of processing image data

1996-03-15

1998-11-03

Moore, David K.

Image analysis

Image compression or coding

Gray level to binary coding

358456, 358457, 358406, 382270, H04N 140

Patent

active

058321225

ABSTRACT:
When threshold data of a threshold matrix are to be established, they are determined in an ascending or descending order so as to maximize the distance between the thresholds in the threshold matrix and other identical threshold matrixes positioned in surrounding relation thereto. After all the thresholds are established, multivalued image data are converted into binary image data using the threshold matrix. A halftone dot image produced on the basis of the binary image data is of a highly accurate nature free from dot gains.

REFERENCES:
patent: 4984283 (1991-01-01), Sakano
patent: 5166809 (1992-11-01), Surbrook
patent: 5526021 (1996-06-01), Naylor, Jr.
patent: 5729663 (1998-03-01), Lin et al.
patent: 5748785 (1998-05-01), Mantell et al.

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