EVALUATING IMAGING EVALUATING IMAGING QUALITY QUALITY Federal Agencies Digitization Initiative – Still Image Federal Agencies Digitization Initiative – Still Image Working Group Working Group Presented by Presented by Michael Stelmach Michael Stelmach Library of Congress, Office of Strategic Initiatives Library of Congress, Office of Strategic Initiatives March, 2009 March, 2009
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EVALUATING IMAGING QUALITY Federal Agencies Digitization Initiative – Still Image Working Group Presented by Michael Stelmach Library of Congress, Office.
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Library of Congress, Office of Strategic InitiativesLibrary of Congress, Office of Strategic InitiativesMarch, 2009March, 2009
The ChallengeThe Challenge
o Define Content CategoriesDefine Content Categorieso Define Imaging ObjectivesDefine Imaging Objectiveso Decide on Measures of QualityDecide on Measures of Qualityo Identify Standard Methods to Derive Identify Standard Methods to Derive
MeasuresMeasureso Design Tools to Evaluate Image Design Tools to Evaluate Image
Performance and QualityPerformance and Qualityo Create Standard Methods of EvaluationCreate Standard Methods of Evaluation
ProgressProgress
o Detailed definitions established for content Detailed definitions established for content categories and imaging objectivescategories and imaging objectives
o Performance measures to be captured Performance measures to be captured and defined (current)and defined (current)
o Performance measurement standards Performance measurement standards identifiedidentified
o Tools developed to validate required Tools developed to validate required image performance measures to actual image performance measures to actual values values
Roadmap to Image Requirements – Content and ObjectivesRoadmap to Image Requirements – Content and Objectives
Combined with…
Roadmap to Image Requirements – Performance MeasuresRoadmap to Image Requirements – Performance Measures
Advances Image Specs FromAdvances Image Specs From
Color vs. MonochromaticColor vs. Monochromatic
Bit DepthBit Depth
Pixel DensityPixel Density
To….To….ToneTone ResolutionResolution Color Color UniformityUniformity NoiseNoise
Digital Image Conformance Evaluation Digital Image Conformance Evaluation (DICE) System(DICE) SystemTargets providing known referencesTargets providing known referencesDevice Target – Imaging Device Device Target – Imaging Device PerformancePerformanceObject Target – Actual Image QualityObject Target – Actual Image QualityEvaluation/Validation Software – Evaluation/Validation Software – LabVIEW-basedLabVIEW-basedData export for use in SQC/SPC Data export for use in SQC/SPC
Device and Object TargetsDevice and Object Targets
Object Target in UseObject Target in Use
DICE Software – Main PanelDICE Software – Main Panel
DICE – QC Summary PanelDICE – QC Summary Panel
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More to Come…More to Come…
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