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made unpaper and convert a little bit nicer to interact with

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This commit is contained in:
Jonas Winkler 2020-11-02 19:31:04 +01:00
parent c28b636ffa
commit 3a08a2d206
2 changed files with 73 additions and 49 deletions
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43
src/documents/parsers.py
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@ -29,6 +29,46 @@ DATE_REGEX = re.compile(
)
logger = logging.getLogger(__name__)
def run_convert(input, output, density=None, scale=None, alpha=None, strip=False, trim=False, type=None, depth=None, extra=None, logging_group=None):
environment = os.environ.copy()
if settings.CONVERT_MEMORY_LIMIT:
environment["MAGICK_MEMORY_LIMIT"] = settings.CONVERT_MEMORY_LIMIT
if settings.CONVERT_TMPDIR:
environment["MAGICK_TMPDIR"] = settings.CONVERT_TMPDIR
args = [settings.CONVERT_BINARY]
args += ['-density', str(density)] if density else []
args += ['-scale', str(scale)] if scale else []
args += ['-alpha', str(alpha)] if alpha else []
args += ['-strip'] if strip else []
args += ['-trim'] if trim else []
args += ['-type', str(type)] if type else []
args += ['-depth', str(depth)] if depth else []
args += [input, output]
logger.debug("Execute: " + " ".join(args), extra={'group': logging_group})
if not subprocess.Popen(args, env=environment).wait() == 0:
raise ParseError("Convert failed at {}".format(args))
def run_unpaper(pnm, logging_group=None):
pnm_out = pnm.replace(".pnm", ".unpaper.pnm")
command_args = (settings.UNPAPER_BINARY, "--overwrite", "--quiet", pnm,
pnm_out)
logger.debug("Execute: " + " ".join(command_args), extra={'group': logging_group})
if not subprocess.Popen(command_args).wait() == 0:
raise ParseError("Unpaper failed at {}".format(command_args))
return pnm_out
class ParseError(Exception):
pass
@ -56,6 +96,9 @@ class DocumentParser:
out_path = os.path.join(self.tempdir, "optipng.png")
args = (settings.OPTIPNG_BINARY, "-silent", "-o5", in_path, "-out", out_path)
self.log('debug', 'Execute: ' + " ".join(args))
if not subprocess.Popen(args).wait() == 0:
raise ParseError("Optipng failed at {}".format(args))

79
src/paperless_tesseract/parsers.py
View File

@ -11,7 +11,8 @@ from PIL import Image
from pyocr import PyocrException
import pdftotext
from documents.parsers import DocumentParser, ParseError
from documents.parsers import DocumentParser, ParseError, run_unpaper, \
run_convert
from .languages import ISO639
@ -39,15 +40,14 @@ class RasterisedDocumentParser(DocumentParser):
# Run convert to get a decent thumbnail
try:
run_convert(
settings.CONVERT_BINARY,
"-density", "300",
"-scale", "500x5000>",
"-alpha", "remove",
"-strip", "-trim",
"{}[0]".format(self.document_path),
out_path
)
run_convert(density=300,
scale="500x5000>",
alpha="remove",
strip=True,
trim=True,
input="{}[0]".format(self.document_path),
output=out_path,
logging_group=self.logging_group)
except ParseError:
# if convert fails, fall back to extracting
# the first PDF page as a PNG using Ghostscript
@ -61,15 +61,14 @@ class RasterisedDocumentParser(DocumentParser):
if not subprocess.Popen(cmd).wait() == 0:
raise ParseError("Thumbnail (gs) failed at {}".format(cmd))
# then run convert on the output from gs
run_convert(
settings.CONVERT_BINARY,
"-density", "300",
"-scale", "500x5000>",
"-alpha", "remove",
"-strip", "-trim",
gs_out_path,
out_path
)
run_convert(density=300,
scale="500x5000>",
alpha="remove",
strip=True,
trim=True,
input=gs_out_path,
output=out_path,
logging_group=self.logging_group)
return out_path
@ -107,14 +106,17 @@ class RasterisedDocumentParser(DocumentParser):
if not guessed_language or guessed_language not in ISO639:
self.log("warning", "Language detection failed.")
ocr_pages = self._complete_ocr_default_language(images, sample_page_index, sample_page_text)
elif ISO639[guessed_language] == settings.OCR_LANGUAGE:
self.log("info", "Detected language: {} (default language)".format(guessed_language))
ocr_pages = self._complete_ocr_default_language(images, sample_page_index, sample_page_text)
elif not ISO639[guessed_language] in pyocr.get_available_tools()[0].get_available_languages():
self.log("warning","Detected language {} is not available on this system.".format(guessed_language))
self.log("warning", "Detected language {} is not available on this system.".format(guessed_language))
ocr_pages = self._complete_ocr_default_language(images, sample_page_index, sample_page_text)
else:
self.log("info","Detected language: {}".format(guessed_language))
self.log("info", "Detected language: {}".format(guessed_language))
ocr_pages = self._ocr(images, ISO639[guessed_language])
self.log("info", "OCR completed.")
@ -133,13 +135,13 @@ class RasterisedDocumentParser(DocumentParser):
# Convert PDF to multiple PNMs
pnm = os.path.join(self.tempdir, "convert-%04d.pnm")
run_convert(
settings.CONVERT_BINARY,
"-density", str(settings.CONVERT_DENSITY),
"-depth", "8",
"-type", "grayscale",
self.document_path, pnm,
)
run_convert(density=settings.CONVERT_DENSITY,
depth="8",
type="grayscale",
input=self.document_path,
output=pnm,
logging_group=self.logging_group)
# Get a list of converted images
pnms = []
@ -187,27 +189,6 @@ class RasterisedDocumentParser(DocumentParser):
return [sample_page]
def run_convert(*args):
environment = os.environ.copy()
if settings.CONVERT_MEMORY_LIMIT:
environment["MAGICK_MEMORY_LIMIT"] = settings.CONVERT_MEMORY_LIMIT
if settings.CONVERT_TMPDIR:
environment["MAGICK_TMPDIR"] = settings.CONVERT_TMPDIR
if not subprocess.Popen(args, env=environment).wait() == 0:
raise ParseError("Convert failed at {}".format(args))
def run_unpaper(pnm):
pnm_out = pnm.replace(".pnm", ".unpaper.pnm")
command_args = (settings.UNPAPER_BINARY, "--overwrite", "--quiet", pnm,
pnm_out)
if not subprocess.Popen(command_args).wait() == 0:
raise ParseError("Unpaper failed at {}".format(command_args))
return pnm_out
def strip_excess_whitespace(text):
collapsed_spaces = re.sub(r"([^\S\r\n]+)", " ", text)