Chapter 44-19F-4-184.5.3 Input Image Processing(iR105)0006-9799iR105Input image data from the reader unit is processed as follows:Image Data from the Reader UnitThe image signals from the reader unit is subjected to shading correction and turned into 8-bit, 256-gradation intensity signals.The input is from 2 signal lines: even-bit pixels and odd-bit pixels.Enlargement/Reduction (main scanning direction)Image data is processed when it is written into or read from image memory for enlargement or reduction.Edge EmphasisEdge emphasis is performed so that the text, text/photo, print photo, or print photo images may be made sharp so as to reduce moire.Edit ProcessingEdit processing is performed to enable the following: blanking/framing, negative/positive reversal, slant, mirror, fold, repeat.Density Conversion (LUT)In this block, intensity signals are converted into density signals; in addition, processing is also performed so that the output density curve best suited toeach mode is obtained.a. LOG ConversionUsing a LOG conversion table, the intensity signals are converted into toner density signals in relation to reflected light.b. Density Adjustment (F-value conversion)Using an F-value table selected in relation to the setting of the Density key in the control panel, density adjustment is performed. It, however, will not beperformed in memory copy mode.c. Density Conversion (gamma conversion)Using a gamma conversion table, density correction is performed for text, text/photo, print photo, or film photo mode.Binary Processing (error diffusion method T-BIC)The error diffusion method (TBIC) is used to control the texture, subjecting data to binary processing so that it becomes most suited for printing.Specifically, the 8-bit image density signals of text, text photo, or print photo mode are converted into 1-bit image density signals (binary).Binary (dither screen method)The dither screen method is used to control the texture, subjecting the data to binary processing. Specifically, the 8-bit image density signals in film photomode are converted into 1-bit image density signals (binary).Although binary, images are produced in 144 gradations owing to the 12 x 12 dither screen processing.4.5.4 Construction of the Image Processing Module0008-2266iR105i/iR105+ / iR9070 / iR8070The machine's major image processing is executed by the main controller PCB.The following shows the construction of the modules associated with image processing:SENDPullScanE-MailPDL PrintBOXPCOriginalCopyAAAPrint outputScanImage dataOther iR machine
