Going grey?: Comparing the OCR accuracy levels of bitonal and greyscale images

D-Lib Magazine

Volumn 15, Issue 3-4, 2009, Pages

  Powell, Tracy ^a   Paynter, Gordon ^a  

^a National Library of   (New Zealand)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 77749306379     PISSN: None     EISSN: 10829873     Source Type: Journal    
DOI: 10.1045/march2009-powell     Document Type: Article

References (7)

1. Current collection statistics are available from: .
2. One way to estimate whether the chosen reels are "typical quality" is to compare their machine-estimated OCR accuracy for the bitonal scans to that of the wider Papers Past collection. The machine-estimated accuracy for the Daily Southern Cross was 95.526% for reel 28258 and 95.277% for reel 28259. This can be compared to the machine-estimated OCR accuracy rates for the first 13 titles OCRed in Papers Past, which were a mixture of poor and high quality titles. These range from 72.90% to 99.20%, with an average of 93.16%. Eleven of the 13 had average estimates in the 90-99% range. This suggests (but does not confirm) that the Daily Southern Cross data in the current experiment were slightly better than average quality.
3. Utah Digital Newspapers Digital Newspaper Project Handbook. Slide 34.
4. Holley, Rose. "Increasing the Accuracy of OCR". .
5. Klijn, Edwin. "The current state-of-art in newspaper digitization: a market perspective". D-Lib Magazine, January/February 2008, 14(1/2), .
6. Holley, Rose. Personal communication