Table 7.
Statistics of the extraction errors
| Error type | #errors | Percentage |
|---|---|---|
| Image defect | 22 | 7.7 % |
| Pre-processing errors | 9 | 3.2 % |
| OCR errors | 149 | 52.5 % |
| Post-processing errors | 3 | 1.1 % |
| Annotation errors | 101 | 35.6 % |
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