Scanned Documents

LBSC 796/INFM 718R

Douglas W. Oard

Week 8, October 29, 2007

Expanding the Search Space

Scanned Docs

Scanned Docs

Identity: Harriet

“… Later, I learned that John had not heard …”

High Payoff Investments

SearchableFraction

Transducer Capabilities

OCRMT

HandwritingSpeech

producedwords

wordsrecognizedaccurately

The Big Picture

• Find the words

• Index the words

• Do ranked retrieval

• Use that system to find what you want

Some Issues

• Language-based search without language!– Shape codes

• Accuracy-selection effect of ranked retrieval– Poor recognition scatters in the query-term space

• Blind relevance feedback– Based on clean text

• Image-domain summaries

Some Applications

• Case management for litigation

• Duplicate detection for declassification productivity and anti-tiling

• Knowledge management from everything I have ever xeroxed or faxed

Some Applications

• Legacy Tobacco Documents Library– http://legacy.library.ucsf.edu/

• Google Books– http://books.google.com/

• George Washington’s Papers– http://ciir.cs.umass.edu/irdemo/hw-demo/