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

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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?

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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.