Savin SDC103A Service Manual download pdf (Page 126)

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101

4.5.5 Main Scan Magnification

Reduction and enlargement in the sub scan direction are done by changing

the scanner speed. However, reduction and enlargement in the main scan

direction are handled by an LSI on the IPU Board.

Scanning and laser writing are done at a fixed pitch (the CCD elements

cannot be squeezed or expanded). So, to reduce or enlarge an image,

imaginary points are calculated that would correspond to a physical

enlargement or reduction of the image. The correct image density is then

calculated for each of the imaginary points based on the image data for the

nearest two true points. The calculated image data then becomes the new

(reduced or enlarged) image data.

NOTE:

The actual calculations for main scan magnification are performed

following the polynomial convolution method. This mathematical

process is beyond the scope of a service manual and will not be

covered here.

Detailed

Section

Descriptions

IMAGE PROCESSING

SM 2-57 A166/A187/A189

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 126

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