| 摘要 |
Digital image data comprising binary pixel values is reproduced without loss of detail with a reproduction unit, such as a laser printer, with a lower basic resolution than the resolution of the image data, by subjecting the image data to a resolution conversion, the resolution being reduced in one direction (to a value which corresponds to the resolution of the reproduction unit) and being increased in the opposite direction. Use is made here of the fact that, in many reproduction units, the resolution may be increased in one direction by increasing the control frequency. The resolution conversion is performed with the aid of a table which comprises a pattern of reproduction pixels for each pattern of original pixels. The patterns of reproduction pixels are selected in such a way that, when the pixels are reproduced, smoothing occurs in the reproduction system. An apparent increase in the reproduction resolution is thereby achieved.
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