| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical image scanner that can reduce a delay caused by lamp warmup, calibrate a PRNU(photo-response non-uniformity) and compensate intensity and color while scanning. SOLUTION: The image scanner has a calibration strip, preferably substantially the full width of the scanline, that is visible to a photosensor array continuously during a scan. For example, if the lamp is in a moving carriage, the calibration strip may be on the moving carriage. At least one separate array of photosensors is used to continuously monitor the intensity of the illumination, along the calibration strip, during a scan. Preferably, the separate array of photosensors also monitors the color of the illumination along the calibration strip.
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