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Add command line option to skip pages that contain font data

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If a page contains font data, the script would abort, unless -f was given,
in which case it would use pdftoppm to rasterize the font into a bitmap
and then attempt to OCR it. -f is almost certainly not what users want
unless they want to debug OCR or something.

If a PDF already has fonts it either was OCR'd already, or it is
a composite file containing, for example, some scanned documents appended
to a text report.  In the latter case, this -s option provides OCR on
pages that don't have it without changing those that do, and if a PDF
was completely OCRed it will be converted to PDF/A.  In batch jobs with
a mix of OCR and non-OCR the implicit conversion to PDF/A is also useful.
This commit is contained in:
Jim Barlow
2014-09-25 02:43:40 -07:00
parent d510e7e4ae
commit 09bbe92611
2 changed files with 20 additions and 4 deletions
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src/ocrPage.sh
+7 -2
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@@ -23,6 +23,7 @@ OVERSAMPLING_DPI="${11}" # Oversampling resolution in dpi
PDF_NOIMG="${12}" # Request to generate also a PDF page containing only the OCRed text but no image (helpful for debugging)
TESS_CFG_FILES="${13}" # Specific configuration files to be used by Tesseract during OCRing
FORCE_OCR="${14}" # Force to OCR, even if the page already contains fonts
SKIP_TEXT="${15}" # Skip OCR on pages that contain fonts and include the page anyway
@@ -119,8 +120,12 @@ dpi=$DEFAULT_DPI # default resolution
getImgInfo "$page" "$widthPDF" "$heightPDF" "$curImgInfo"
ret_code="$?"
# in case the page contains text do not OCR, unless the FORCE_OCR flag is set
if ([ "$ret_code" -eq "1" ] && [ "$FORCE_OCR" -eq "0" ]); then
# Handle pages that already contain a text layer
if ([ "$ret_code" -eq "1" ] && [ "$SKIP_TEXT" -eq "1" ]); then
echo "Page $page: Skipping processing because page contains text..."
pdfseparate -f $page -l $page ${FILE_INPUT_PDF} $curOCRedPDF
exit 0
elif ([ "$ret_code" -eq "1" ] && [ "$FORCE_OCR" -eq "0" ]); then
echo "Page $page: Exiting... (Use the -f option to force OCRing, even though fonts are available in the input file)" && exit $EXIT_BAD_INPUT_FILE
elif ([ "$ret_code" -eq "1" ] && [ "$FORCE_OCR" -eq "1" ]); then
[ $VERBOSITY -ge $LOG_WARN ] && echo "Page $page: OCRing anyway, assuming a default resolution of $dpi dpi"