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Developing a strategy for quality
Ira RevelsDigital Project Manager
Cornell University Library
Session Goal
Workshop participants will be able to assess image quality and implement a strategy
for quality control assessment.
Session Objectives Overview the Factors involving image
quality control Review Tasks and Methods for assessing
image and metadata quality Demonstrate image/metadata quality control
methods Pair Exercise
Learner Outcomes Be able to Recognize image quality
control factors Understand and apply tasks and
methods in the assessment of image quality
Perform QC calibration methods on equipment and using QC Assessment survey guidelines
Overview of QC Factors
Factors involved in achieving image and metadata qualityStrategy based on project goalsReference pointScope and methods of your quality reviewQC environmentSystem performanceCodify your procedures
04/19/23 Digital Imaging Workshop 5
QC Inspection Tasks & problems Image Capture
Halftones○ Moiré patterns
Grayscale images○ Contrast enhancement○ Histogram Equalization○ Threshold (loss of distinct lines)
Poor image quality○ Uneven lighting, distortion, out of focus○ Skew
Missing/duplicated pages○ Human operator error
QC Inspection Tasks & problems Text Recognition
Positioning○ Orientation
Segmentation○ Incorrect region types or ranges
Metadata Incorrect metadata Improper use of element standard
Quality Assessment Methods
Image capture > manual correction through software
Poor image quality > manual calibration, auto-sharpen, auto de-screen filter, manual cropping, enhancement through software
Incorrect image segmentation > manual correction through software
Incorrect metadata > manual correction and find & replace (automated) correction through software
Metadata Quality Assessment
Automated correction can apply to the following tasks:Incorrect entry > find and replace
Manual correction can apply to the following tasks:Metadata entry using Dublin CoreMisinterpretation of element standardsIncorrect file naming
Metadata QC Examples
Metadata QC Examples
What are we doing about image quality assessment?
04/19/23 Digital Imaging Workshop 12
What are we doing about quality assessment?
Exercise Manual Calibration Applying Quality Control Assessment
Survey methodsGo to
http://hbculibraries.org/docs/basic_production_steps_v3.1.pdf
○ On your desktop open the folder called “Enhancement Exercise”
○ Open the TIFF image and ○ beginning with # 9 on the Production Steps
follow the directions for using the histogram tool.
Bibliography Kenney, A.R. and Rieger, O.Y. Moving Theory Into Practice:
Digital Imaging for Libraries and Archives. 2000. Research Libraries Group.
The Library of Congress. “Quality Review of Document Images: Internal Training Guide.” National Digital Library Program. September 1996. Available online at: [http://lcweb2.loc.gov/ammem/award/docs/docimqr.html]
Lin, X, “Quality Assurance in High Volume Document Digitization: A Survey.” Proceedings of the Second International Conference on Document Image Analysis for Libraries, Lyon, France, April 2006, pp. 312-319.