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…. 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…

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

21. More to Come…
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