| 摘要 |
Structures and methods thereof for a scanner with two CCD arrays, which respectively capture two independent object images in one scan action, are provided. Three functions: a. image recovery, b. double resolution, and c. high dynamic range can be achieved for the transparent media and the reflective media. The image defects caused by the dust, pollutants, or scratches can be recovered by comparing the different shadows formed by two light-sources in two object images for the reflective media or comparing two object images formed respectively by a visible light-source and a infrared light-source for the transparent and reflective media. The function of double resolution can be achieved by making a relative displacement of half pixel-distance between two CCD arrays in their longitudinal direction. The function of high dynamic range can be achieved by setting two different exposure time for two CCD arrays.
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