Method and apparatus for reducing a pattern of binary pixels to

Details Method and apparatus for reducing a pattern of binary pixels to Method and apparatus for reducing a pattern of binary pixels to

1990-02-12

1992-03-31

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358433, 358451, 382 56, G06K 900

Patent

active

051014432

ABSTRACT:
Method and apparatus for converting a pattern, consisting of a matrix of binary pixels and representing a pseudo half-tone picture in particular, into a pattern having a lower resolution, in which the picture to be reduced is subdivided into fields and the pixels having a predetermined binary value in each field are counted, as a result of which a reduced quasi-real grey-tone picture develops. This grey-tone picture is compared to thresholds of a repeatedly used threshold matrix and the comparison results then provide the binary pixels of the reduced pseudo half-tone picture. A further reduction is obtained in that at a regular distances fields or grey-tone pixels respectively, are omitted from the fields of the matrix of the picture to be reduced or from the pixels of the grey-tone picture produced meanwhile.

REFERENCES:
patent: 4555191 (1985-11-01), Gojo
patent: 4783838 (1988-11-01), Matsunawa
patent: 4827353 (1989-05-01), Ehlers et al.
patent: 4930022 (1990-05-01), Kubota

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