Halftone image scaling

Details Halftone image scaling Halftone image scaling

1984-08-13

1986-09-09

Kreitman, Stephen A.

Image analysis

Histogram processing

For setting a threshold

G06K 936

Patent

active

046113495

ABSTRACT:
A method of enlarging or reducing the size of a halftone one bit per pixel raster image without changing the screen pitch is disclosed. First, there is a determination of whether the current byte is on an image edge using any edge detection means. If the current byte is on an edge, the nearest neighbor algorithm is applied to the original image on a bit by bit basis to prevent edge jaggedness. If the current byte is not on an edge, the nearest neighbor algorithm is applied on a byte by byte basis to prevent Moire patterns in the solid areas of the image.

REFERENCES:
patent: 3604846 (1971-09-01), Behane et al.
patent: 4381547 (1983-04-01), Ejiri
M. W. Smith et al., "A New Algorithm for Edge Detection", Computer Graphics and Image Processing, vol. 4, No. 1, pp. 55-62, Mar. 1975.

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