Image processing function overview
The image signals from the SBU are subjected to various image processing, and output to the controller (memory) via a PCI bus. The image signals from the controller (memory) are received via the PCI bus, and output to the LDB via a GAVD (the LDB is provided in the write unit).
For the direct fax transmission application, the image signals from the SBU are subjected to various image processing, and output to the FCU via the PCI bus.
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 MFP unit as digital signals-2 bit/pixels.
Image processing items | Details |
|---|---|
Shading correction | Corrects for uneven scanner lamp lighting, and scatter in CCD light receiving sensitivity. |
Line interval correction | Line shift during subscanning magnification/reduction by scanner. Corrects integer part. |
Dot correction | Line shift during subscanning magnification/reduction by scanner. Corrects below decimal point. |
Vertical line correction | Corrects a vertical striped image during sheet-through ADF. |
Image area separation | Determines text parts and photo parts of image. |
Scanner gamma correction | Corrects scatter of image data relative to exposure amount. From reflectivity linear to density linear. |
Filter | Performs image sharpness adjustment and removes moire. |
ADS | Performs natural complexion removal in full color mode. |
Color compensation preprocessing | Determines hue in masking mode, and improves chromaticity. |
Color compensation | Converts RGB data to density value CMYK data of color materials. |
Image magnification change | Arbitrarily changes main scanning magnification, subscanning fixed image reduction and magnification of scanner image. |
Image shift function | Shifts image data in the main scanning or subscanning directions. |
Image binarization function | In scanner mode, outputs a binary signal. |
Image mask | Masks an area outside a frame of an arbitrary region in scanner or printer data. |
Image compression/expansion | Compresses or expands an image. |
Printer gamma correction | Adjusts exposure amount of photosensitive body relative to image density. |
Gradation processing | Applies 600dpi, 4bit 16 value gradation processing. |