Savin SDC103A Service Manual download pdf (Page 118)

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101

(1) Edge separation

The edge of letters and line diagram elements are separated by using the

following characteristics:

Strong contrast, continuity of black or color pixels, continuity of white pixels

around the black or color pixels

The machine can do this by referring to the green signal only.

(2) Dot screen separation

Dot screen areas are separated from non-dot screen areas (mainly letters)

by using the following characteristics:

White pixels are not detected around the non-white pixels in dot screen

areas. The machine can do this by referring to the green signal only.

(3) Colored letter separation

Black pixels and color pixels in letter areas are identified by determining the

difference among RGB maximum signal levels and the output levels of RGB

video signals.

The separation signal accompanies the data as it passes to the further

stages of image processing. The separation signal tells the image

processing circuits whether the data is Black Letter, Color Letter, or Photo.

The letter areas are processed in letter mode and the photo areas are

processed in photo mode in the subsequent image processing steps.

Auto letter/photo separation is mostly effective only for small letters or thin

line diagram elements. If there are big letters or solid line drawing elements

in the original, only the edges of these are processed using letter mode; the

inner regions are processed using photo mode.

Detailed

Section

Descriptions

IMAGE PROCESSING

SM 2-49 A166/A187/A189

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 118

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