Ricoh MP C2504 Field Service Manual page 1121

7. Detailed Descriptions
IPU
Image processing function overview
The image signals from the SBU are subjected to various image processing, and output to the
controller (memory). The image signals from the controller (memory) are received, and output to
the LDB (the LDB is provided in the write unit).
Image processing overview (copy application)
Digital signal data output from the SBU is subjected to shading correction and line interval
correction, as well as image processing, which are performed by the IPU. Finally, the data is sent to
the machine as digital signals-4 bit/pixels.
Image processing items
Shading correction
Line interval correction
Dot correction
Vertical line correction
Image area separation
Scanner gamma
correction
Filter
ADS
Color compensation
preprocessing
Color compensation
Image magnification
change
Image shift function
Image binarization
function
1112
Corrects for uneven scanner lamp lighting, and scatter in CCD light
receiving sensitivity.
Line shift during subscanning magnification/reduction by scanner.
Corrects integer part.
Line shift during subscanning magnification/reduction by scanner.
Corrects below decimal point.
Corrects a vertical striped image during sheet-through ADF.
Determines text parts and photo parts of image.
Corrects scatter of image data relative to exposure amount.
From reflectivity linear to density linear.
Performs image sharpness adjustment and removes moire.
Performs natural complexion removal in full color mode.
Determines hue in masking mode, and improves chromaticity.
Converts RGB data to density value CMYK data of color materials.
Arbitrarily changes main scanning magnification, subscanning fixed
image reduction and magnification of scanner image.
Shifts image data in the main scanning or subscanning directions.
In scanner mode, outputs a binary signal.
Details