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PRNU(Photo Response Non-Uniformity):

CCD elements aren’t identical in their response to light. Two different CCD elements exposed with the same intensity light output two slightly different voltages. This is called “photo-response non-uniformity” (PRNU) and a scanner has to compensate for it. Ineffective PRNU compensation causes vertical streaks in the image.

A scanner measures PRNU in a test scan of a built-in, calibrated target strip. The output of each CCD element is compared to the expected voltage for that target strip.

Since PRNU is a gain factor, its compensation is more important than for dark voltage. (An average value doesn’t work well because PRNU is multiplied instead of added or subtracted.) After the scanner measures PRNU and DSNU, it compensates with either a digital value or analog voltage.

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  • 4 年前
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    PRNU(Photo Response Non-Uniformity):

    CCD elements aren’t identical in their response to light. Two different CCD elements exposed with the same intensity light output two slightly different voltages. This is called “photo-response non-uniformity” (PRNU) and a scanner has to compensate for it. Ineffective PRNU compensation causes vertical streaks in the image.

    A scanner measures PRNU in a test scan of a built-in, calibrated target strip. The output of each CCD element is compared to the expected voltage for that target strip.

    Since PRNU is a gain factor, its compensation is more important than for dark voltage. (An average value doesn’t work well because PRNU is multiplied instead of added or subtracted.) After the scanner measures PRNU and DSNU, it compensates with either a digital value or analog voltage.

    光響應不均勻性:

    CCD元件在光響應上不同,有兩個不同的CCD元件藉由稍微不同的電壓投射相同的光強度,即為所謂的「光響應不均勻性」(PRNU),掃描儀需進行補償。無效的PRNU補償可能導致影像出現直向條紋。

    掃描儀使用內建的校準目標帶進行測試PRNU的量測,各個CCD元件的輸出與目標帶的預期電壓值進行比較。

    因為PRNU屬增益因子,其補償對暗電壓更為重要(因為PRNU屬乘數值而非增加值或扣減值,因此平均值無作用。)。掃描儀量測PRNU和DSNU後,可藉由數位或類比值進行補償。

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