20. Display and printing - 2011

20. Display and printing - 2011 - EE 638: Principles of...

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EE 638: Principles of Digital Color Imaging Systems Lecture 22: Display and Printing
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Synopsis General Model for Display and Printing Processes Line-Continuous Scanning Systems Matrix-Addressable Systems General Model Ideal Reconstruction Zero Order Hold Reconstruction Aliasing Artifacts Overview of Spatiochromatic Models for the Human Visual System (HVS)
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Line-Continuous Scanning Systems -- reconstructed image -- write spot -- scan signal
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Recall
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Matrix-Addressable Systems Recall
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General Model
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Ideal Reconstruction
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Spatial domain interpretation
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If Nyquist conditions are satisfied, i.e. then
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Zero Order Hold Reconstruction
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Aliasing Artifacts Due to presence of replications for which in spectrum of reconstructed image Result in spurious lo frequency patterns in displayed or printed image: Moiré Patterns Jagged rendition of straight edges
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Aliasing Artifacts in Image (2 Examples) 1) Moiré pattern Original image Moiré pattern formed by down-sampling 2) Jaggies (staircase effect)
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during sampling of a sinew ave grating
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This note was uploaded on 02/19/2012 for the course ECE 638 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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20. Display and printing - 2011 - EE 638: Principles of...

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