| 摘要 |
<p>In a first mode of the present invention, provided is a white level setting method for an image scanner, in which this white level used for the next scanline is so set that a source document or a w white reference is scanned, the analogue image signal produced by the scanning is compared with a predetermined analogue white level signal, the digital image signal corresponding to the image on the source document is then generated, and the white level is calculated from this digital image signal. In a second mode of the present invention, provided is a binary-code judgment method for an image scanner, in which data of an image having been read is divided into blocks of a given unit, the change rate of density data of each block is found, edge portions of the image data is detected using the rate, and slice value of each block for binarizing the image data is determined on the basis of the density data. <IMAGE></p> |
