Converting between write-white, write-black and neutral bitmaps

Details Converting between write-white, write-black and neutral bitmaps Converting between write-white, write-black and neutral bitmaps

1991-12-06

1993-11-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358451, 358455, 382 55, 382 47, H04N 140

Patent

active

052588548

ABSTRACT:
A bitmap to be prepared for printing by a printing process with a characteristic dilation or erosion artifact, is initially increased in resolution by a selected factor. The bitmapped image is then increased or decreased in size, at the increased resolution, by an amount necessary to compensate for the characteristic erosion or dilation of the printing process. The bitmap is rescanned, or reduced in resolution, to the original resolution of the image. The rescanned image is highly binary in appearance, but will include a number of gray level pixels in areas where it has been increased in size. Prior to printing, the pixel values are subjected to a quantizing process where gray level pixel values are reduced to binary values, preferably through an error diffusion process which operates only on gray pixels. The process of increasing the bitmap resolution may include a step of smoothing halfbitting.

REFERENCES:
patent: 4466123 (1984-08-01), Arai et al.
patent: 4837847 (1989-06-01), Shirasaka et al.
patent: 5045952 (1991-09-01), Eschbach
patent: 5060082 (1991-10-01), Matsumoto et al.
patent: 5117294 (1992-05-01), Yano
patent: 5134503 (1992-07-01), Kimura
patent: 5166810 (1992-11-01), Sorimachi et al.
An Optimum Method for Two-Level Rendition of Continuous-Tone Pictures, B. E. Bayer, IEEE International Conference on Communications, vol. 1, pp. 26-11 to 26-15 (1973).
An Adaptive Algorithm for Spatial Greyscale, Floyd and Steinberg, Proceedings of the SID 17/2, 75-77 (1976).

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