| 摘要 |
storing mean compensation coefficients of pixels for compensating irregularity of a light source when a scan roller(12) is ideally white; calculating the difference between the mean compensation coefficients of a contaminated scan roller and the mean compensation coefficients of a white scan roller; and compensating the coefficients of the contaminated scan roller by adding or subtracting the difference of the compensation coefficients to provide the good quality of image.
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