Method for edge enhanced error diffusion

Details Method for edge enhanced error diffusion Method for edge enhanced error diffusion

1989-08-21

1991-09-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358466, H04N 140

Patent

active

050459520

ABSTRACT:
A method of dynamically adjusting the threshold level of an error diffusion algorithm to selectively control the amount of edge enhancement introduced into the encoded output. The threshold level is selectively modified on a pixel by pixel basis and may be used to increase or decrease the edge enhancement of the output digital image, thus, more closely representing the original detail and edge sharpness of the continuous tone input image.

REFERENCES:
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patent: 4625222 (1986-11-01), Bassetti et al.
patent: 4672463 (1987-06-01), Tomohisa et al.
patent: 4693593 (1987-09-01), Gerger
patent: 4700229 (1987-10-01), Herrmann
patent: 4709250 (1987-11-01), Takeuchi
patent: 4724461 (1988-02-01), Rushing
patent: 4748515 (1988-05-01), Van Daele et al.
Article "An Adaptive Algorithm for Spatial Greyscale by R. W. Floyd et al. in the Proceedings of the Society for Information Display", vol. 17; 1976.
Article "On The Error Diffusion Technique for Electronic Halftoning" by C. Billotet-Hoffmann-et al. published in the Proceedings of the SID, vol. 24/3; 1983.

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