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Implement autorotate (provided lossless reconstruction is disabled)

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Works for a single page file, probably

Although arguably rotation is not quite lossless, and the two could be
mutually exclusive anyway, so maybe this is it. Did not check in some
debugging changes (lossless=False, text debugging=True)

PyPDF seems to get merging wrong when one of the pages is rotated.
This commit is contained in:
James R. Barlow 2016-02-07 03:27:33 -08:00
parent e9ec458304
commit 4b51b521e2
2 changed files with 240 additions and 147 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
ocrmypdf/main.py
View File

@ -440,7 +440,69 @@ def split_pages(
@transform(
input=split_pages,
filter=suffix('.ocr.page.pdf'),
filter=suffix('.page.pdf'),
output='.preview.png',
output_dir=work_folder,
extras=[_log, _pdfinfo, _pdfinfo_lock])
def rasterize_preview(
input_file,
output_file,
log,
pdfinfo,
pdfinfo_lock):
ghostscript.rasterize_pdf(
input_file=input_file,
output_file=output_file,
xres=200,
yres=200,
raster_device='pnggray',
log=log)
@collate(
input=[split_pages, rasterize_preview],
filter=regex(r".*/(\d{6})(\.ocr|\.skip)(?:\.page\.pdf|\.preview\.png)"),
output=os.path.join(work_folder, r'\1\2.oriented.pdf'),
extras=[_log, _pdfinfo, _pdfinfo_lock])
def orient_page(
infiles,
output_file,
log,
pdfinfo,
pdfinfo_lock):
page_pdf = next(ii for ii in infiles if ii.endswith('.page.pdf'))
preview = next(ii for ii in infiles if ii.endswith('.preview.png'))
orient_conf = tesseract.get_orientation(
preview,
language=options.language,
timeout=options.tesseract_timeout,
log=log)
print(orient_conf)
if orient_conf.angle == 0:
re_symlink(page_pdf, output_file)
else:
if orient_conf.confidence < 15:
log.warning(
'Low orientation confidence {:.1f}'.format(
orient_conf.confidence))
writer = pypdf.PdfFileWriter()
reader = pypdf.PdfFileReader(page_pdf)
page = reader.pages[0]
# Rotate opposite of orientation
rotated_page = page.rotateClockwise(orient_conf.angle)
writer.addPage(rotated_page)
with open(output_file, 'wb') as out:
writer.write(out)
@transform(
input=orient_page,
filter=suffix('.ocr.oriented.pdf'),
output='.page.png',
output_dir=work_folder,
extras=[_log, _pdfinfo, _pdfinfo_lock])
@ -571,8 +633,8 @@ def select_image_for_pdf(
@active_if(options.pdf_renderer == 'hocr')
@collate(
input=[select_image_for_pdf, split_pages],
filter=regex(r".*/(\d{6})(?:\.image|\.ocr\.page\.pdf)"),
input=[select_image_for_pdf, orient_page],
filter=regex(r".*/(\d{6})(?:\.image|\.ocr\.oriented\.pdf)"),
output=os.path.join(work_folder, r'\1.image-layer.pdf'),
extras=[_log, _pdfinfo, _pdfinfo_lock])
def select_image_layer(
@ -582,7 +644,7 @@ def select_image_layer(
pdfinfo,
pdfinfo_lock):
page_pdf = next(ii for ii in infiles if ii.endswith('.page.pdf'))
page_pdf = next(ii for ii in infiles if ii.endswith('.ocr.oriented.pdf'))
image = next(ii for ii in infiles if ii.endswith('.image'))
if lossless_reconstruction:
@ -679,8 +741,8 @@ def add_text_layer(
@active_if(options.pdf_renderer == 'tesseract')
@collate(
input=[preprocess_clean, split_pages],
filter=regex(r".*/(\d{6})(?:\.pp-clean\.png|\.page\.pdf)"),
input=[preprocess_clean, orient_page],
filter=regex(r".*/(\d{6})(?:\.pp-clean\.png|\.ocr\.oriented\.pdf)"),
output=os.path.join(work_folder, r'\1.rendered.pdf'),
extras=[_log, _pdfinfo, _pdfinfo_lock])
def tesseract_ocr_and_render_pdf(
@ -754,8 +816,8 @@ def generate_postscript_stub(
@transform(
input=split_pages,
filter=suffix('.skip.page.pdf'),
input=orient_page,
filter=suffix('.skip.oriented.pdf'),
output='.done.pdf',
output_dir=work_folder,
extras=[_log])

309
pipeline.svg
View File

@ -4,261 +4,292 @@
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-->
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Side by Side Swipe Overlay

Before

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After

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