Chapter 55-18(1) Analog Image Processing(a) drives the CCD(b) performs gain correction and offset correction for the CCD output(c) performs A/D conversion for the CCD output(2) Digital image Processing(a) performs shading correctionF-5-305.3.7.2 Driving the CCD 0013-8594Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iRC2550The machine's CCD sensor is a linear image sensor that consists of 3 lines (RGB, 1 line each), and it is composed of 7488-pixel photocells. The signals generatedthrough photo conversion at the light-receiving segment are sent as analog signals according to pixels in the order of G, B, and R.F-5-315.3.7.3 Gain Correction and Offset Correction for the CCD Output 0013-8595Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iRC2550The analog video signal from the CCD is subjected to gain correction (in which the rate of amplification is corrected to a specific level) and offset correction (inwhich the output voltage in the absence of incident light is also corrected to a specific level).5.3.7.4 A/D Conversion of the CCD Output 0013-8597Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iRC2550CCD (RGB, 1 line each)Analogimage signalAnalogimage processing- gain correction- offset correctionA/DconversionCCD drive controlSCD controlsignalLine correctiondataDigitalimage signalEven-numberedpixelOdd-numberedpixelOdd-numberedpixelEven-numberedpixelCCD/AP circuit10Digitalimage signal8Reader controller PCBContact image sensor (CIS)TargetvalueJ203EEP-ROMSRAMCPUShadingcorrectionCCD15 CCD13RGBRGBRGBRGBRGBRGBRGBRGBRGBRGBRGBCCD1CCD2CCD16 CCD14RGBRG B RG B RG B G B ......outputSingle analogshift register
