COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001CHAPTER 3 MAIN CONTROLLER3-82 Digital Image Processing2.1 OutlineThe digital processing and controlling of image memory of the machine are performed bythe main controller PCB. The following is a block diagram showing its digital image pro-cessing:F03-201-01 Block Diagram8Reader unitEdit processingDensity conversion(LUT)Binary processing(error diffusing method; text,text/photo, print/print photo)Image memorycontrolBinary processing(dither screen; film photo)8Density correction(γ conversion)888Edge emphasis1Compression/expansion,rotation,enlargement/reductionSDRAMI/O control HDD4 or 2Thickening4 or 21Smoothing1Binary-binary densityconversionPrinter unitPrinter PG188Main controller blockDensity adjustment(F-value conversion)Intensity/density conversion(LOG conversion)Enlargement/reduction(main scanning direction)Reader PG Image dataafter shading
