Method of scaling an image capable of line width preservation

Details Method of scaling an image capable of line width preservation Method of scaling an image capable of line width preservation

1993-06-01

1996-07-23

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 358451, 382298, H04N 1387, H04N 1393

Patent

active

055395341

ABSTRACT:
In scaling an image, a projected position is corrected in accordance with pixel values of original pixels surrounding a projected position where a pixel of a scaled image is projected onto an original image, and a pixel value of a pixel of a scaled image is determined in accordance with pixel values of original pixels surrounding a projected position after correction. Further, when a pixel of an original image is processed with a pixel run as a unit, coordinates of an end pixel of a pixel run in a scaled image are corrected based on the width of the pixel run and a scale factor.

REFERENCES:
patent: 4930021 (1990-05-01), Okada
patent: 5068905 (1991-11-01), Hackett et al.
patent: 5089893 (1992-02-01), Iwase
patent: 5121222 (1992-06-01), Endoh et al.
Arai, Kohei, et al. "A Study on Facsimile Line-Density Conversion Scheme," (An Analysis of Linear Density Conversion of Facsimile,) Journal of the Institute of Image Electronics Engineers of Japan, vol. 7, No. 1, 1978, pp. 11-18. (English--Summary Only).
Endoh, Toshiaki, et al. "Reduction Method of Bi-Level Image with Thin Line Preservation," IECE Fall Conference, 1989, pp. (D-86) 6-86. (Japanese).
Okada, Yoshiyuki, et al. "Fine Line Preservation Algorithm of Reduction for Bi-Level Images," IECE Spring Conference, 1990, pp. (D447) 7-199. (Japanese).

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