Image processor with error diffusion modulated threshold matrix

Details Image processor with error diffusion modulated threshold matrix Image processor with error diffusion modulated threshold matrix

1991-06-18

1992-09-22

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

358457, 358463, 358466, 382 54, G06K 938

Patent

active

051504294

ABSTRACT:
An image processor performs error diffusion by thresholding an incoming gray pixel to black or white, comparing the difference between the black or white print value and the incoming pixel gray level and superimposing the difference on the next pixel gray level. The threshold value is read out from a threshold matrix which has been modulated with a pattern which is complementary to the known artifact pattern of the error diffusion process. Typically, the threshold matrix has sparce threshold values along one of its diagonals, the direction of the diagonal being perpendicular to the prevailing direction of artifacts generated by the error diffusion algorithm.

REFERENCES:
patent: 4339774 (1982-07-01), Temple
patent: 4366507 (1982-12-01), Mori
patent: 4393452 (1983-07-01), Sekigawa
patent: 4412256 (1983-10-01), Heinzl et al.
patent: 4449150 (1984-05-01), Kato
patent: 4449240 (1984-05-01), Yoshida
patent: 4562486 (1985-12-01), Suzuki et al.
"Multiple Error Correction Algorithm for Halftone Continuous Tone and Text Reproduction" by S. J. Fox et al, IBM Technical Disclosure Bulletin, vol. 23, No. 10, Mar. 1981, pp. 4433-4435.
"A Survey of Electronic Techniques for Pictorial Image Reproduction" by J. C. Stoffel et al, IEEE Transactions on Communications, vol. Com-29, No. 12, Dec. 1981, pp. 1898-1925.

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