| 摘要 |
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.
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