| 摘要 |
A binary image generating method and apparatus using location information of minority pixels. A modified input pixel value u(m, n) is calculated by adding a value obtained by filtering an error value e(m, n) of a previous binary pixel to a currently input continuous tone pixel value i(m, n). An ideally optimum distance dopt(i(m, n)) between the currently input continuous tone pixel value i(m, n) and a minority pixel is calculated. A minimum distance dm between the input pixel and minority pixels is calculated using location information of the minority pixels at minimum distances from binary pixels adjacent to the input pixel. A threshold value t(m, n) is calculated using the ideally optimum distance dopt(i(m, n)) and the minimum distances dm for the currently input continuous tone pixel value i(m, n). The threshold value t(m, n) is compared with the modified input pixel value u(m, n) to determine a binary pixel value b(m, n) of the input pixel. The location information of the minority pixels at the minimum distances from the input pixel is then stored.
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