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Specify dpi in image header for tesseract

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See https://github.com/tesseract-ocr/tesseract/issues/150
This commit is contained in:
Raman Gupta 2020-07-29 18:01:20 -04:00
parent 30a7be1fd8
commit b6ff50a4b0
2 changed files with 5 additions and 3 deletions
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4
README.md
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@ -26,7 +26,7 @@ Tested and run regularly on Fedora, but should work on other distributions with
* pnmtops (netpbm-progs) * pnmtops (netpbm-progs)
* ps2pdf (ghostscript) * ps2pdf (ghostscript)
* pdfunite * pdfunite
* ImageMagick (if --skip-empty-pages) is used * ImageMagick (if --skip-empty-pages or --ocr is used)
### Optional ### Optional
@ -71,7 +71,7 @@ OPTIONS
--unpaper --unpaper
Run post-processing deskew and black edge detection (requires unpaper) Run post-processing deskew and black edge detection (requires unpaper)
--ocr --ocr
Run OCR to make the PDF searchable (requires tesseract) Run OCR to make the PDF searchable (requires tesseract and ImageMagick)
--skip-empty-pages --skip-empty-pages
remove empty pages from resulting PDF document (e.g. one sided doc in duplex mode) remove empty pages from resulting PDF document (e.g. one sided doc in duplex mode)

4
scan_perpage
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@ -87,7 +87,9 @@ process_page() {
log "-------------------------------------------------------------------------------" log "-------------------------------------------------------------------------------"
if [ $SEARCHABLE -eq 1 ]; then if [ $SEARCHABLE -eq 1 ]; then
log "Converting image data to searchable pdf..." log "Converting image data to searchable pdf..."
runconstrained tesseract $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE $IMAGE_DIR/${IMAGE_FILE%.*} -l $LANGUAGE pdf | logstdout # tesseract uses the input's DPI header, we need to convert to a format that supports this (like tiff)
convert -density ${RESOLUTION}x${RESOLUTION} -units PixelsPerInch $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.tiff
runconstrained tesseract $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.tiff $IMAGE_DIR/${IMAGE_FILE%.*} -l $LANGUAGE pdf | logstdout
else else
log "Converting image data to pdf..." log "Converting image data to pdf..."
if [ "$PGWIDTHIN" == "" -o "$PGHEIGHTIN" == "" ]; then if [ "$PGWIDTHIN" == "" -o "$PGHEIGHTIN" == "" ]; then