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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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Presentation on theme: "EVALUATING IMAGING QUALITY Federal Agencies Digitization Initiative – Still Image Working Group Presented by Michael Stelmach Library of Congress, Office."— Presentation transcript:

1 EVALUATING IMAGING QUALITY Federal Agencies Digitization Initiative – Still Image Working Group Presented by Michael Stelmach Library of Congress, Office of Strategic Initiatives March, 2009

2 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

3 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

4 Roadmap to Image Requirements – Content and Objectives Combined with…

5 Roadmap to Image Requirements – Performance Measures

6 Advances Image Specs From Color vs. Monochromatic Bit Depth Pixel Density

7 To….ToneResolutionColorUniformityNoise Gamma Gamma White White Balance Balance Spatial Spatial Frequency Frequency Response (SFR) Response (SFR) Resolution Resolution Sampling Sampling Efficiency Efficiency Sampling Sampling Frequency Frequency Luminance Luminance Delta E 2000 Delta E 2000 Delta E(a*b*) 2000 Delta E(a*b*) 2000 Channel Channel Mis-registration Mis-registration % Lighting % LightingNon-uniformity Total rms Total rms deviation deviation Specific to content and objectives…

8 Example of Concept Requirements Matrix

9 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

10 Device and Object Targets

11 Object Target in Use

12 DICE Software – Main Panel

13 DICE – QC Summary Panel

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21 More to Come… To keep up with our progress and submit your suggestions, please visit


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