EVALUATING IMAGING QUALITY Federal Agencies Digitization Initiative – Still Image Working Group...
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EVALUATING IMAGING EVALUATING IMAGING QUALITY QUALITY
Federal Agencies Digitization Initiative – Still Image Working GroupFederal Agencies Digitization Initiative – Still Image Working Group
Presented byPresented byMichael StelmachMichael Stelmach
Library of Congress, Office of Strategic InitiativesLibrary of Congress, Office of Strategic InitiativesMarch, 2009March, 2009
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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
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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
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Roadmap to Image Requirements – Content and ObjectivesRoadmap to Image Requirements – Content and Objectives
Combined with…
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Roadmap to Image Requirements – Performance MeasuresRoadmap to Image Requirements – Performance Measures
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Advances Image Specs FromAdvances Image Specs From
Color vs. MonochromaticColor vs. Monochromatic
Bit DepthBit Depth
Pixel DensityPixel Density
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To….To….ToneTone ResolutionResolution Color Color UniformityUniformity NoiseNoise
GammaGamma
WhiteWhite BalanceBalance
SpatialSpatial FrequencyFrequency Response (SFR) Response (SFR)
ResolutionResolution
SamplingSampling EfficiencyEfficiency
SamplingSampling FrequencyFrequency
LuminanceLuminance
Delta EDelta E20002000
Delta E(a*b*)Delta E(a*b*)20002000
ChannelChannel Mis-registrationMis-registration
% Lighting % Lighting Non-uniformityNon-uniformity
Total rmsTotal rms deviationdeviation
Specific to content and objectives…
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Example of Concept Requirements Matrix
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Image Performance Measure – Image Performance Measure – ToolsTools
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
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Device and Object TargetsDevice and Object Targets
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Object Target in UseObject Target in Use
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DICE Software – Main PanelDICE Software – Main Panel
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DICE – QC Summary PanelDICE – QC Summary Panel
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More to Come…More to Come…
To keep up with our progress and submit To keep up with our progress and submit your suggestions, please visityour suggestions, please visit
http://digitizationguidelines.gov/http://digitizationguidelines.gov/