Toshiba E-STUDIO900 Manuel d'utilisateur télécharger pdf (Page 43)

PTM 2-18 B070/B071

2.3.3 IMAGE PROCESSING FLOW

Image processing is done by the IPU (Image Processing Unit), following the steps

shown below.

Overall image processing for this machine is designed to:

• Target edges with filters to improve the angles of text characters and reduce the

occurrence of moiré filled areas.

•

Improve the evenness of granular areas in images

Shading Correction

Corrects the dispersion of the scanning

lens and CCD.

Gamma Correction Background erase

Pre-Filter Reduces the occurrence of moiré.

Main Scan Magnification

Auto Select

Determines if an image is text or raster

image data and processes the data

accordingly.

Selects the best methods for Filtering,

Density Control, and Grayscale

Processing.

Filtering

MTF and smoothing (MTF filter of

previous machines)

Either of two filters is selected by Auto

Select above.

Independent Dot Erase Removes isolated pixels.

Line Width Correction

Density Control

Employs one of two gamma tables,

selected by Auto Select above

Grayscale Processing

Error diffusion, dithering, or binary picture

processing

Black-and-white digitization or dithering is

selected by “Auto Select above.

Video Path

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Application (printer)

LD Unit

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Toshiba E-STUDIO900 Manuel d'utilisateur Page 43