46. General measures - formatter prescreening - 2011

46. General measures - formatter prescreening - 2011 - An...

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Unformatted text preview: An automated image prescreening tool for a printer qualification process by † Du-Yong Ng and ‡ Jan P. Allebach † Lexmark International Inc. ‡ School of Electrical and Computer Engineering, Purdue University Synopsis Anatomy of a formatter-based EP laser printer Overview of a printer qualification process Motivation Examples of artifacts Image fidelity metrics – prior work Prescreening tool Experiment Results Conclusion Anatomy of a formatter-based EP laser printer Print Engine Formatter Control Panel Overview of a printer qualification process Phase I The formatter (hardware + firmware) and the print engine are developed in parallel. The hardware portion of the formatter is not ready. The firmware of formatter is tested using a simulator . Test image (PDL) Newly developed firmware + simulator Firmware of an earlier product + simulator Master Current Digital outputs match qualitatively? Overview of a printer qualification process (cont.) Phase II Preproduction print engines are either scarce or not available yet. Preproduction formatter hardware is available. The formatter (firmware + hardware) is tested with a print engine emulator. Test image (PDL) Newly developed formatter + print engine emulator Formatter of an earlier product + print engine emulator Digital outputs match qualitatively? Master Current Overview of a printer qualification process (cont.) Phase III Preproduction printers (formatter + print engine) are available. Test image (PDL) Newly developed printer Earlier printer model Hardcopies match qualitatively? Master Current Overview of a printer qualification process - summary Simulator without actual formatter / emulator with actual formatter Test image (PDL) Softcopy current image Comparison masters Softcopy Formatter/ firmware development teams Debug Error flagged Actual formatter Hardcopy current image Print engine Hardcopy Debug...
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46. General measures - formatter prescreening - 2011 - An...

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