Abstract: An image scanning method for a scanner that can simultaneously sense image signals corresponding to the three primary colors or a monochromic color, and store the signals in a storage device within one exposition process. The scanning method can further determine a period of the driving signal and a number of rotation steps for the driving motor to calculate the period of the triggering signal for a light-sensitive device. The scanning method according to the invention can therefore reduce the time needed for a scanning process and improve efficiency. Furthermore, the signal-to-noise ratio of a CCD module can be improved, and the requirement for the brightness of the light source is lowered as well.

Abstract: A motor-speed control apparatus is provided for use on a scanner of the type having a movable scan head, such as a flatbed scanner, for the purpose of controlling the operation a stepper motor used to drive the CCD (charge coupled device) scan head of the scanner. In this motor-speed control apparatus, a Y data table is predetermined, which includes a number of Y data sets, each corresponding to one line in the lengthwise direction (i.e., the Y-axis direction) of the document being scanned. In operation of the scanner when the scan head is to be moved over the document, the manipulation on each pixel in the lengthwise direction is based on the predetermined values of the corresponding Y data set. This allows the scan head to move in a non-target area of the document (the area that is not to be scanned), and at a fixed speed when moving over the target area of the document (the area that is to be scanned).