Kodak Document Scanner 9500 with/without Image Manager 9500 Instrukcja Użytkownika Pobierz pdf (Strona 80)

A-61122/A-61124 March 1999 E-7

Noise filter

The scanner uses two types of Noise filters: Remove Lone Pixel

and Majority Rule. Use the Noise filter to increase the

compression ratio and improve the appearance of document

images.

• Remove Lone Pixel — reduces random noise on bi-tonal

images by converting a single black pixel surrounded by white

to white or by converting a single white pixel surrounded by

black to black.

• Majority Rule — sets the central pixel value in a matrix

according to the majority of white or black pixels in a matrix.

NOTES:

• Using the Noise filter on documents containing very fine detail

(e.g., the dot on an "i" in 4-point type) may cause information to

be lost. It is recommended that you do not use the Noise filter

when scanning documents with text smaller than 7-point type.

• Using the Noise filter in conjunction with an appropriate

threshold value will optimize the appearance of images.

• Do not use the Noise filter with screening or error

diffusion/mixed mode.

Refer to Chapter 6

, Scanner-unique Commands

for a description

of the NX/Y/Z command.

This document has a significant amount of background noise:

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 100 101

Brak uwag

Kodak Document Scanner 9500 with/without Image Manager 9500 Instrukcja Użytkownika Strona 80