Canon F-1, Руководство по обслуживанию

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Technology > Controls > DADF > Original Scanning Assembly
Technology > Controls > DADF > Original Scanning Assembly
Dust detection correction control (noncontinuous lines)
This control detects and corrects lines caused by dust that failed to be detected between sheets.
Dust attached to the original is not detected at the lead edge of the original.
This dust can be attached to the original again after being remained at the scanning position due to friction with the scanning glass while this dust passes through the scanning position. In this case,
this dust will not be detected even at the trail edge because the dust is fed together with the original.
The lines (created as described above), occurring noncontinulusly from the lead edge to the trail edge of the original, are detected for image correction.
Correction is performed symmetrically for lines stretching in sub (vertical) scanning direction on scanned image. Identifying lines (caused by dust) with length, color and brightness of lines, correction
is performed for such lines determined as lines caused by dust
Before scanning After scanning Scanning result
Platen roller 2 Original
Scanning glass
Scanning position
Floating dust
It sticks on the original
during scanning
Note: Additional functions (Streak Prevention)
Setting is available whether to execute removing of noncontinuous lines when scanning
original.
Setting is available as follows:
• On: detect noncontinuous lines to remove (default)
• Off: do not remove noncontinuous lines
If there are ultrafine lines on the original while this item is set ON, they are wrongly
detected as noncontinuous lines, and those ultrafine lines can be removed from the
scanning image. Select OFF for this item if there is frequent removing of lines due to
wrong detection for ultrafine lines on the original.
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