| 摘要 |
<p>A raster scanner with linear scanning array, a scanning slit permitting the array to view a document image one line at a time, and document transport for transporting documents past the scanning slit. To accommodate the disparity between scanning rates and user data rates, a relatively small buffer stores lines of pixels output by the array pending user demand. Intermittent operation of the scanner in response to buffer pixel demands is effected through starting and stopping of the document transport. A control is provided to prevent uneven spacing of scan lines resulting from scanning stopped documents or documents in the process of being accelerated or decelerated to and from scanning speed by the document transport.</p> |
