Fujitsu M3097DG 3.2.4Halftone reading

Image Functions

3.2.4Halftone reading

[A.4.7 SET WINDOW command/Image Composition = X’01’]

This scanner supports two types of halftone image, that is Dither and Error Diffusion.

(1)Dither

[A.4.7 SET WINDOW command / Halftone type = X’01’]

This is a way of producing halftone images with white and black pixels. The scanned image is processed by the unit of group of pixels.

At first a reference table called “dither matrix” is specified. Each element in the matrix (8x8) has a threshold value of 256 levels. Allocation of threshold values in the dither matrix is called “dither pattern”. Group of the scanned images are compared with the dither pattern, and each element is decided whether it is black or white. Number of black pixels corresponds to a level of scale, producing pseudo grayscale images.

Four built-in dither patterns are available.

(2)Error diffusion

[A.4.7 SET WINDOW command / Halftone type = X’02’]

This is a way of producing halftone (Pseudo grayscale) images with white and black pixels. Optical density of pixels and its adjacent pixels are totaled and black pixels are repositioned in the order of density in accordance with relations between adjacent pixels.

This scheme aims to minimize errors between scanned density and printed density on the average. Density data of adjacent pixels are modified by diffusing errors on the objective pixel into several pixels to be binarized. This scheme is aimed to keep high levels of grayscale and high resolution, producing high quality halftone. Especially when dotted halftone images like photos on the newspaper are scanned, this scheme suppresses moire patterns.

Following parameters are available for this function

The parameters which affects the Halftone image are shown in Table 3.5.

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Contents

Page Page Page Page Chapter General Image Functions Storage and Installation Operation and Maintenance Error display and Recovery Appendix A-1 Appendix B Interface deference between M3097DG and M3093DG Appendix B-1 Page Chapter 1 General 1.1General description Page Chapter 2 Specifications 2.1Basic specifications Table 2.1 Basic Specifications of M3097DG 2.2Option specifications Table 2.2 Option of the scanner Figure 2.1 IPC-2D/3Doption Figure 2.2 Extended memory option 2.3Reading limitation depending on the memory installed Table The reading limitation of M3097DG without option The reading limitation of M3097DG at zooming of IPC-2Dor IPC3D option 2.4Physical specifications Physical specifications 2.5Regulation conformity Regulation conformity 2.6Document specifications 2.6.1Paper size Figure Paper size Paper size conversion table 2.6.2Paper conditions Page 2.6.3ADF capacity Figure 2.4 ADF capacity 2.6.4Areas that must not be perforated (for ADF reading only) Figure 2.5 Areas that must not be perforated 2.6.5Grounding color area Figure 2.6 Grounding color area 2.6.6Job separation sheet Figure 2.7 Job separation sheet Chapter 3 Image Functions 3.1Overview of the image functions Table 3.1 Image functions Functions which are available for main window and sub-window 3.2Basic image functions 3.2.1Output resolution 3.2.2Main Window Clipping Table 3.3 Mechanical offset error of the scanner Figure 3.1 The window position and limitation of FB reading Figure 3.2 The window position and limitation of ADF reading Figure 3.3 Matrix size limitation of the Window Page 3.2.3Binary reading Table 3.4 Parameter of Binarization 3.2.4Halftone reading Parameters of Halftone 3.2.5Grayscale reading 3.2.6Compression Table 3.6 Parameter of Compression 3.3Optional image function 3.3.1DTC mode function (Auto I mode) Page Table 3.8 Parameter of Gradation Table 3.9 The deference of Dynamic Threshold Curve parameter Page Page Parameter of Smoothing 3.3.2IPC mode (Auto II mode) Page Table 3.13 Parameter of Image Emphasis Page Table 3.14 parameter of Outline Extraction Table Parameter of Automatic Separation Table 3.16 Parameter of Mirror Image Table 3.17 Parameter of Black and White Reverse 3.3.4Zooming 3.3.5Dither download 3.3.6Gamma download Chapter 4 Storage and Installation 4.1Packaging box and storage condition Table 4.1 Physical specifications of the packaging box Figure 4.1 Packaging box 4.2Components in the packaging box The components in the box 4.3Installation procedure 4.3.1Removing the carrier fixing bracket Page 4.3.2Connections 4.3.3Mounting the stacker 4.3.4SCSI-IDsetting Chapter 5 Operation and Maintenance 5.1Operator panel operation 5.1.1Operator panel function Table 5.1 Functions of buttons and LEDs Table 5.2 Functions of the counter 5.1.2Manual Feed mode Figure 5.1 Mode change 5.1.3Setup mode Table 5.3 Functions of Setup mode Page Next,Enter,Exit Next Next,Enter Enter at Yes Next,EnterPrevious Table 5.4 Function of CE mode 5.2Document setting 5.2.1Document setting on ADF paper chute Page Page 5.2.2Document setting on flatbed 5.3Cleaning Table 5.5 Cleaning of the scanner 5.4Consumable Parts replacement Figure 5.3 Pad ASY Page Chapter 6 Error display and Recovery 6.1Error display 6.1.1Temporary error 6.1.2Alarm 6.2Jam clearance Page Appendix A Scanner Interface A.1 Physical Specifications Table A.1 SCSI physical specifications Figure A.1 Pin assignment A.2 SCSI Bus A.2.1 System configuration A.2.2 Bus signals A.2.3 Bus signal drive conditions Table A.2 Bus phases vs. signal drive sources Table A.3 Method of driving the interface signal A.3 Bus Phases Figure 4.2 Phase sequence Table A.4 Signal delay times definition (1/2) Table A.4 Signal delay times definition (2/2) A.3.1 BUS FREE phase A.3.2 ARBITRATION phase Page A.3.3 SELECTION phase A.3.4 RESELECTION phase A.3.5 INFORMATION TRANSFER phases Table A.5 INFORMATION TRANSFER phase type Page Page Page Page A.4 Commands Table A.6 Commands A.4.1 RESERVE UNIT command Page A.4.2 RELEASE UNIT command A.4.3 INQUIRY command Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page A.4.4 REQUEST SENSE command Page Page Page Page A.4.5 SEND DIAGNOSTIC command Page A.4.6 TEST UNIT READY command A.4.7 SET WINDOW command Page Note: Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page A.4.8 SET SUBWINDOW command Page Page Page Page Page Page Page A.4.9 OBJECT POSITION command Page Page Page A.4.10 SEND command Page Page Page Page Page A.4.11 READ command Page Page Page Page Page Notes: A.4.12 MODE SELECT (6) Page Page Page Page Page A.4.13 MODE SENSE (6) Page Page Page A.4.14 SCAN Page A.5 Status: STATUS phase (target ® initiator) A.6 Messages A.6.1 ATN detection A.6.2 Message types Page Page Page Page Page Page Page A.7 Command Sequence A.7.1 Initial sequence A.7.2 Command sequence to read Page Page A.7.3 READ command sequence A.7.3.1 Single read (disconnect disabled) A.7.3.2 Single read (disconnect enabled) A.7.3.3 Multiple read (disconnect disabled) A.7.3.4 Multiple read (disconnect enabled) Page A.8 Status Transition of Logical Unit A.9 Error Table B.1 Product identification Table B.1.1 Product identification Table B.1.2 Scanner which can be emulated B.2 Window width and length Table B.2.1 Window width and length B.3 Buffering capability Table B.3.1 Physical function B.4 Window data limitation Table B.4.1 Window data limitation for M3097DG B.5 Paper size specification B.6 Paper width X limitation of nonstandard size document Table B.6.1 The limitation of paper width B.7 The limitation of grayscale output Table B.7.1 The limitation of grayscale output of M3093DG B.8 Paper size at DATA IN phase after Read command B.9 General Remarks B.9.1 Command sequence B.9.2 Additional sense code/ Additional sense code qualifier Table B.9.1 Sense code and sense code qualifier not in OEM manual Appendix C Throughput C.1 Offline test C.2 Online test