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EVALUATING IMAGING QUALITY
Federal Agencies Digitization Initiative – Still Image Working Group Presented by Michael Stelmach Library of Congress, Office of Strategic Initiatives March, 2009
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The Challenge Define Content Categories Define Imaging Objectives
Decide on Measures of Quality Identify Standard Methods to Derive Measures Design Tools to Evaluate Image Performance and Quality Create Standard Methods of Evaluation
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Progress Detailed definitions established for content categories and imaging objectives Performance measures to be captured and defined (current) Performance measurement standards identified Tools developed to validate required image performance measures to actual values
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Roadmap to Image Requirements – Content and Objectives
Combined with…
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Roadmap to Image Requirements – Performance Measures
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Advances Image Specs From
Color vs. Monochromatic Bit Depth Pixel Density
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To…. Specific to content and objectives… Tone Resolution Color
Uniformity Noise Gamma White Balance Spatial Frequency Response (SFR) Resolution Sampling Efficiency Luminance Delta E2000 Delta E(a*b*)2000 Channel Mis-registration % Lighting Non-uniformity Total rms deviation Specific to content and objectives…
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Example of Concept Requirements Matrix
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Image Performance Measure – Tools
Digital Image Conformance Evaluation (DICE) System Targets providing known references Device Target – Imaging Device Performance Object Target – Actual Image Quality Evaluation/Validation Software – LabVIEW-based Data export for use in SQC/SPC
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Device and Object Targets
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Object Target in Use
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DICE Software – Main Panel
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DICE – QC Summary Panel
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