November 1998-2 XRD9827ITGREF SCANNER DEMO SYSTEM USER MANUAL

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November 1998-2 XRD9827ITGREF SCANNER DEMO SYSTEM USER MANUAL

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XRD9827ITGREF
November 1998-2
XRD9827ITGREF SCANNER DEMO SYSTEM USER MANUAL
Rev. 1.00
EXAR Corporation, 48720 Kato Road, Fremont, 94538 (510) 668-7000 (510) 668-7017
XRD9827ITGREF
OTHER EXAR PRODUCT DEMOS THAT AVAILABLE XRD9812ITGREF FLATBED SCANNER XRD9812 flatbed scanner higher performance than XRD9827 Flatbed Scanner. XRD9827REF SHEETFED SCANNER XRD9827REF 12-Bit, Line Display Sheetfed Scanner. XRD9829REF SHEETFED SCANNER XRD9829REF 10-Bit, Line Display Sheetfed Scanner.
XRD9827ITGREF FLATBED SCANNER DEMO SYSTEM XRD9827ITGREF 36-Bit flatbed scanner. optics, CCD, motor, chassis lamp UMAX 1200S scanner used with electronics designed EXAR ITG. None electronics made UMAX. Figure block diagram components used design XRD9827ITGREF scanner. XRD9827 Installation User Manual installation procedures. digital controller product specifically designed XRD9827 analog front processor. more information XRD9827, refer XRD9827 Datasheet.
Address Data DIGIT DIGITAL CONTROLLER SCANNERS
EXAR XRD9827
Control
BOARD
8031
EPROM
SCSI
Figure XRD9827ITGREF Block Diagram
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XRD9827ITGREF
SYSTEM COMPONENTS INFORMATION Scanning Element: Color CCD, NEC3717 processing: XRD9827 CCD/CIS Processor Mode Operation: Single Channel, Pixel-by-Pixel Gain Offset Adjustment Register Settings (s2, d0): 110-0-0-0-0-1-1-01 Scan Mode Power Down, Normal Digital Reset, Reset Internal Input Reference, Internal, Vdcref AGND Coupled Mode Inverted Mode Single Channel, Input, Pixel-by-Pixel Gain Offset Digit Digital Controller: Contact Details. DATA POST PROCESSING XRD9827ITGREF 36-Bit Color scanner. This accomplished using 12-Bit Analog Digital Conversion each channel (XRD9827). communication between scanner display only bits. Therefore, color mapping from 12-Bit data 8-Bit data happens post processing digital ASIC. Below Figure block diagram color mapping technique used XRD9827ITGREF.
Linear Binning 12-Bit 8-Bit 12-Bit Data Color Correction White Balance 8-Bit Data
Figure Color Mapping from 12-Bit 8-Bit Gamma performed conjunction with digital ASIC. 12-Bit data from XRD9827 directly mapped into 8-Bit data while taking into consideration overall system noise fixed pattern noise. Fixed pattern noise subtracted color correction process. During mapping process, white balance also taken into consideration. White balance process that adjusts gain each color intensity that 8-Bit data saturated. This process preserves best high light detail image scanned.
SCSI OUTPUT DATA FORMAT XRD9827ITGREF designed interface through SCSI Interface. installing SCSI drivers XRD9827ITGREF, XRD9827 Installation User Manual. output from scanner SCSI format.
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SCANNING TARGETS
Perhaps most useful demonstration scan grey scale target. Figure example grey scale taken from Kodak Color Input Target (see Figure used demonstrate dynamic range XRD9827. grey scale target picture displaying range from zero scale (black) full scale (white) color intensity. scan this target compared original histogram analysis.
Figure XRD9827 Scan Grey Scale
Figure Kodak Color Input Target
histogram (using Adobe Photoshop) plot amplitude pixel intensity code ADC. Histogram effective tool characterizing performance scanner. Below Figure histogram taken from scan grey scale Figure point using histogram tool evaluating standard deviation each expected output code.
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XRD9827ITGREF
Figure Histogram Taken from Scan Grey Scale
Standard Deviation corresponds output referred noise. lower value standard deviation, less noise present system. standard deviation measurement distribution around expected output code. Below Figure graph showing relationship between standard deviation noise. Sigma (Standard Deviation 1.0) Gaussian Noise
Figure Graph Displaying Relationship Between Standard Deviation Gaussian Noise
Rev. 1.00
XRD9827ITGREF
Below Figure histogram taken from scan black image. When scanning black image, expected that pixel count will occur zero scale output code histogram there offset associated with analog digital conversion. offset present, calibrated XRD9827 digital ASIC. Some amount offset usually preferred that signal content lost below zero scale.
Figure Histogram Taken from Scan Black Target, Std. Dev. 0.99 sigma noise Different values offset used scanner applications. Dependent customer, value range from code code scan black image. typical range from code code From graph seen that black pixel values occur 17.89 rather than zero scale. Ideally, there will distribution histogram centered around output code. However, system noise always present causing distribution among pixel response. Instead having pixel response occuring unique bin, there range codes where pixel counts responded. standard deviation 0.99 which equivalent sigma noise. standard deviation across grey scale output code displays information needed determine acceptance distribution. example: standard deviation 3.00 particular code maximum value acceptable application, standard deviation taken across entire grey scale used indicate whether system noise reduction necessary. Since XRD9827 scanner 12-Bit application, system noise critical clean signal path from image sensor XRD9827. sensor system layout will typically leading cause noise, XRD9827. XRD9827 XRD9812 SCANNER XRD9827 designed with different architecture than XRD9812. XRD9812 12-Bit with higher accuracy DNL, SNR, lower noise, etc. XRD9812 best utilized when digital ASIC system circuitry designed match higher performance ADC. Figure shows standard deviation across grey scales using XRD9827, XRD9812 Wolfson 8143-12 using Kodak target.
Rev. 1.00
XRD9827ITGREF
Standard Deviations Kodak Q-60RI Gray Scale Chart
6.00
5.00
Wolfson 8143-12
4.00 Series1 Series2 3.00 Series3 Series4 Series5 2.00
Std. Deviation
Exar XRD9827
1.00
Exar XRD9812
0.00 Gray Scale
Figure Standard Deviation Grey Scale Output Code XRD9827, XRD9812, Wolfson 8143-12 Using Kodak Target graph shows resemblance between XRD9827 XRD9812 performance making both parts ideal scanning applications. XRD9827 cost without sacraficing performance 12-Bit converter. Wolfson shows increase noise darker grey scale. Figure Figure show XRD9827 Output Noise Gain Input Referred Noise Gain respectively.
XRD9827ACD Output Noise Gain
Output Noise Gain 6MHz
Figure XRD9827 Output Noise Gain
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XRD9827ITGREF
XRD9827ACD Input Referred Noise Gain
Gain Input Reffered
Figure XRD9827 Input Referred Noise Gain
Figure Figure show XRD9812 Three Channel Output Noise Gain Input Referred Noise Gain respectively.
4.00 3.50 noise (LSB's) 3.00 2.50 2.00 1.50 1.00 0.50 0.00
XRD9812ACQ Output Noise Gain ADCCLK=6Mhz, AVDD=5V, DVDD=3V, Inputs shorted AGND through 100pf
Output Noise
Gain (Gain Code)
Figure XRD9812 Output Noise Gain
Rev. 1.00
XRD9827ITGREF
2.00 1.80 1.60 1.40 noise (LSB's) 1.20 1.00 0.80 0.60 0.40 0.20 0.00
XRD9812ACQ Input Referred Noise Gain ADCCLK=6Mhz, AVDD=5V, DVDD=3V, Inputs shorted AGND through 100pf
Input Referred Noise
Gain (Gain Code)
Figure XRD9812 Input Referred Noise Gain
REFERENCES Analog-Digital Covnersion Handbook Third Edition, Analog Devices, 1986. Figure Graph Displaying Relationship Between Standard Deviation Gaussian Noise
Rev. 1.00
XRD9827ITGREF
Notes
Rev. 1.00
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Notes
Rev. 1.00
XRD9827ITGREF
NOTICE EXAR Corporation reserves right make changes products contained this publication order improve design, performance reliability. EXAR Corporation assumes responsibility circuits described herein, conveys license under patent other right, makes representation that circuits free patent infringement. Charts schedules contained here only illustration purposes vary depending upon user's specific application. While information this publication been carefully checked; responsibility, however, assumed accuracies. EXAR Corporation does recommend products life support applications where failure malfunction product reasonably expected cause failure life support system significantly affect safety effectiveness. Products authorized such applications unless EXAR Corporation receives, writing, assurances satisfaction that: risk injury damage been minimized; user assumes such risks; potential liability EXAR Corporation adequately protected under circumstances. Copyright 1998 EXAR Corporation Datasheet November 1998 Reproduction, part whole, without prior written consent EXAR Corporation prohibited.
Rev. 1.00

November 1998-2 XRD9827ITGREF SCANNER DEMO SYSTEM USER MANUAL

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