| 摘要 |
PURPOSE:To enlarge and reduce a binarization picture without producing a moire fringe even if the binarization picture has a periodical structure and to make the filtering of the binarization picture easy by applying the filtering to the number of picture elements and deciding the density level of each block from the picture element of a filtering device. CONSTITUTION:The binarization picture is divided into blocks of appropriate sizes and then the number of black picture elements in every block is counted, and an operation is shifted to filtering. For example, the number of original black picture elements shown in figure (b) is converted to that of conversion black picture elements shown in figure (c) by using a space filter (a). Thus, the density level of every block is decided by the number of the conversion black picture elements and the first density matrix pattern is obtained. After the first density matrix pattern is obtained, the second density matrix pattern sizing in proportion to a multiplying facter of an enlargement or a reduction is obtained in every block and then an enlarged or reduced picture line is obtained in a block order.
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