Savin SDC103A Service Manual download pdf (Page 114)

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4.5 IPU SECTION

4.5.1 Picture Element Correction and Scanner Gamma Correction

(1) Picture Element Correction

The Picture Element Correction circuit does two things.

1. Completion of the Scan Line Correction process

The discrepancy in the spacing of the RGB signals from the CCD in the

subscan direction is corrected by the line correction circuit in the scanner

section (refer to 3-6. Scan Line Correction). However, if the correction data

corresponding to the magnification ratio is not an integer, then further

correction is needed to synchronize the RGB signals.

2. Correction if the CCD is not perpendicular to the light

If the CCD board is not perpendicular to the light axis, the position of each

pixel is different from the original image position. This difference becomes

larger towards the ends. Under this condition, vertical black lines (in the

subscan direction) at the left and right edges of the original are colored

because the C, M, and Y toner dots are not properly positioned. (An example

of this is the vertical lines at the right and left edges of the C4 color chart.)

Therefore, the CCD line spacing is also corrected here. The target areas for

this correction are shown above. The green CCD line is taken as a standard,

and the ends of the red and blue lines are corrected. The vertical line

correction level can be changed using SP mode (SP 4-932-1 to 4-932-4).

Detailed

Section

Descriptions

IMAGE PROCESSING

SM 2-45 A166/A187/A189

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 114

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