Dataset for the competition on Post-OCR Text Correction 2019 (Post-OCR 2019) (Post-OCR_2019)

Research Tasks

Correction of OCR errors

2019-10-20 (v. 1)

Contact author

Christophe Rigaud

L3i - University of La Rochelle

+33 5 46 45 82 62

+ 33 5 46 45 82 42


Given the OCR errors in their context, the participants are asked to provide, for each error, either a) only one correction or b) a ranked list of candidates for correction. Providing multiple candidates enables the evaluation of semi-automated techniques. We will thus take into account and evaluate 2 families of systems:

  1. "Fully-automated" systems, meant for the comparative evaluation of fully automatic OCR correction tools, where we only take into account one correction candidate;
  2. "Semi-automated" systems, meant for the comparative evaluation of human-assisted correction tools, where a person typically picks the right correction within a list of system-generated candidate corrections (in that case, the higher-ranked the right correction, the better the system).


As mentioned earlier, the correction task involves a list of candidate words for each error and will be evaluated on two different scenarios:

  • "fully automated" scenario, taking into consideration only the highest-weighted word in each list;
  • "semi-automated" scenario, exploited all the proposed corrections along with their weight.

The chosen metric considers for every token, a weighted sum of the Levenshtein distances between the correction candidates and the corresponding token in the Ground Truth. So the purpose is to minimize that distance over all the tokens.


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