| 摘要 |
A method to convert gray level image data (V) from image input terminals, into binary data (O) for high-addressability image output terminals. High addressability output terminals such as printers (100) increase their virtual resolution in the fast scan direction in order to achieve a higher effective printing resolution. For example, one pixel (102) in the slow scan direction divided into eight pixels (106) in the fast scan direction, improves a printer's actual resolution from n spots x m spots per unit area to (8 * n) spots x m spots per unit area. Gray level input data representing pixel data from image input terminals such as scanners is encoded by either an analog signal or a quantized digital signal with a large number of levels (e.g. 256 levels). Binary output data has pixels with either a value of one or zero or a much smaller number of gray levels compared to digital input signals. <IMAGE> |
