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August 29, 2015 10:32
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Parallel for Tesseract OCR and lulti-page pdfs
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| #!/bin/bash | |
| #ocrpdftotext | |
| # adjusted implementation of http://ubuntuforums.org/showthread.php?t=880471 | |
| DPI=300 | |
| TESS_LANG=eng | |
| FILENAME=${@} | |
| TMP_NAME=`basename "$FILENAME" .pdf` | |
| OUTPUT_FILENAME=${TMP_NAME}-out-${DPI}.txt | |
| PAGES=`pdfinfo "$FILENAME" | grep Pages | sed -r "s/^[^0-9]*([0-9]+)$/\1/"` | |
| for i in `seq 1 $PAGES`; do | |
| convert -density ${DPI} -depth 8 -background white -flatten +matte ${FILENAME}\[$(($i - 1 ))\] "${TMP_NAME}-${i}.tif" | |
| done | |
| parallel "tesseract {} {.} " ::: ${TMP_NAME}-*.tif | |
| for i in `seq 1 $PAGES`; do cat ${TMP_NAME}-${i}.txt; done >> "${OUTPUT_FILENAME}" |
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When using programs that use GNU Parallel to process data for publication please cite:
O. Tange (2011): GNU Parallel - The Command-Line Power Tool,
;login: The USENIX Magazine, February 2011:42-47.
This helps funding further development; and it won't cost you a cent.