sporada/ocr
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More GhostScript, less dependencies!

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This commit is contained in:
Patrick Jentsch 2020-07-02 11:47:43 +02:00
parent 2b63ba9e59
commit 7322a5bc7c
2 changed files with 21 additions and 66 deletions
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1
Dockerfile
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@ -14,7 +14,6 @@ RUN apt-get update \
ca-certificates \ ca-certificates \
gnupg2 \ gnupg2 \
ghostscript \ ghostscript \
poppler-utils \
python2.7 \ python2.7 \
python3.7 \ python3.7 \
wget \ wget \

84
ocr
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@ -36,9 +36,6 @@ def parse_args():
parser.add_argument('--binarize', parser.add_argument('--binarize',
action='store_true', action='store_true',
help='Use ocropy binarisation as preprocessing step.') help='Use ocropy binarisation as preprocessing step.')
parser.add_argument('--compress',
action='store_true',
help='Compress the final PDF result file.')
parser.add_argument('--log-dir') parser.add_argument('--log-dir')
parser.add_argument('--n-cores', parser.add_argument('--n-cores',
default=min(4, multiprocessing.cpu_count()), default=min(4, multiprocessing.cpu_count()),
@ -59,15 +56,13 @@ class OCRPipelineJob:
class OCRPipeline(WorkflowRunner): class OCRPipeline(WorkflowRunner):
def __init__(self, binarize, jobs, lang, n_cores, output_dir, zip, def __init__(self, binarize, jobs, lang, n_cores, output_dir, zip):
compress):
self.binarize = binarize self.binarize = binarize
self.jobs = jobs self.jobs = jobs
self.lang = lang self.lang = lang
self.n_cores = n_cores self.n_cores = n_cores
self.output_dir = output_dir self.output_dir = output_dir
self.zip = zip self.zip = zip
self.compress = compress
def workflow(self): def workflow(self):
if not self.jobs: if not self.jobs:
@ -160,28 +155,20 @@ class OCRPipeline(WorkflowRunner):
''' '''
' ################################################## ' ##################################################
' # post binarization # ' # Renaming of binarization output files #
' ################################################## ' ##################################################
''' '''
post_binarization_jobs = []
for i, job in enumerate(self.jobs): for i, job in enumerate(self.jobs):
input_dir = os.path.join(job.output_dir, 'tmp') input_dir = os.path.join(job.output_dir, 'tmp')
output_dir = input_dir output_dir = input_dir
number = 0
files = filter(lambda x: x.endswith('.bin.png'), files = filter(lambda x: x.endswith('.bin.png'),
os.listdir(input_dir)) os.listdir(input_dir))
files.sort()
for file in files: for file in files:
# int conversion is done in order to trim leading zeros # int conversion is done in order to trim leading zeros
output_file = os.path.join(output_dir, 'page-{}.bin.png'.format(int(file.split('.', 1)[0]))) # noqa page_number = int(file.split('.', 1)[0])
cmd = 'mv "{}" "{}"'.format(os.path.join(output_dir, file), output_file = 'page-{}.bin.png'.format(page_number)
output_file) os.rename(os.path.join(output_dir, file),
deps = 'binarization_-_{}'.format(i) os.path.join(output_dir, output_file))
lbl = 'post_binarization_-_{}-{}'.format(i, number)
post_binarization_jobs.append(
self.addTask(command=cmd, dependencies=deps, label=lbl)
)
number += 1
''' '''
' The ocr_jobs are created based of the output files of either the ' The ocr_jobs are created based of the output files of either the
@ -217,7 +204,7 @@ class OCRPipeline(WorkflowRunner):
cmd += ' && ' cmd += ' && '
cmd += 'sed -i \'s+{}/++g\' "{}".hocr'.format(input_dir, output_file_base) # noqa cmd += 'sed -i \'s+{}/++g\' "{}".hocr'.format(input_dir, output_file_base) # noqa
if self.binarize: if self.binarize:
deps = 'post_binarization_-_{}-{}'.format(i, number) deps = 'binarization_-_{}'.format(i)
else: else:
deps = 'split_input_-_{}'.format(i) deps = 'split_input_-_{}'.format(i)
label = 'ocr_-_{}-{}'.format(i, number) label = 'ocr_-_{}-{}'.format(i, number)
@ -241,13 +228,20 @@ class OCRPipeline(WorkflowRunner):
combined_pdf_creation_jobs = [] combined_pdf_creation_jobs = []
for i, job in enumerate(self.jobs): for i, job in enumerate(self.jobs):
input_dir = os.path.join(job.output_dir, 'tmp') input_dir = os.path.join(job.output_dir, 'tmp')
output_dir = job.output_dir
files = filter(lambda x: x.endswith('.pdf'), files = filter(lambda x: x.endswith('.pdf'),
os.listdir(input_dir)) os.listdir(input_dir))
files.sort(key=lambda x: int(re.search(r'\d+', x).group(0))) files.sort(key=lambda x: int(re.search(r'\d+', x).group(0)))
files = map(lambda x: os.path.join(input_dir, x), files) files = map(lambda x: os.path.join(input_dir, x), files)
output_file = os.path.join(job.output_dir, output_file = os.path.join(output_dir, '{}.pdf'.format(job.name))
'{}.pdf'.format(job.name)) cmd = 'gs'
cmd = 'pdfunite "{}" "{}"'.format('" "'.join(files), output_file) cmd += ' -dBATCH'
cmd += ' -dNOPAUSE'
cmd += ' -dPDFSETTINGS=/ebook'
cmd += ' -dQUIET'
cmd += ' -sDEVICE=pdfwrite'
cmd += ' "-sOutputFile={}"'.format(output_file)
cmd += ' "{}"'.format('" "'.join(files))
deps = filter(lambda x: x.startswith('ocr_-_{}'.format(i)), deps = filter(lambda x: x.startswith('ocr_-_{}'.format(i)),
ocr_jobs) ocr_jobs)
lbl = 'combined_pdf_creation_-_{}'.format(i) lbl = 'combined_pdf_creation_-_{}'.format(i)
@ -321,38 +315,6 @@ class OCRPipeline(WorkflowRunner):
''' '''
self.waitForTasks() self.waitForTasks()
'''
' ##################################################
' # pdf compression #
' ##################################################
'''
pdf_compression_jobs = []
n_cores = min(self.n_cores, max(1, int(self.n_cores / len(self.jobs))))
if self.compress:
for i, job in enumerate(self.jobs):
file = filter(lambda x: x.endswith('.pdf'), os.listdir(job.output_dir))[0] # noqa
original_file = os.path.join(job.output_dir, file)
compressed_file = os.path.join(job.output_dir, 'c_' + file)
cmd = 'gs'
cmd += ' -dBATCH'
cmd += ' -dNOPAUSE'
cmd += ' -dNumRenderingThreads={}'.format(n_cores)
cmd += ' -dPDFSETTINGS=/ebook'
# -dCompatibilityLevel must be defined after -dPDFSETTINGS
cmd += ' -dCompatibilityLevel=1.4'
cmd += ' -dQUIET'
cmd += ' -sDEVICE=pdfwrite'
cmd += ' "-sOutputFile={}"'.format(compressed_file)
cmd += ' "{}"'.format(original_file)
cmd += ' && '
cmd += 'mv "{}" "{}"'.format(compressed_file, original_file)
deps = 'combined_pdf_creation_-_{}'.format(i)
lbl = 'pdf_compression_-_{}'.format(i)
pdf_compression_jobs.append(self.addTask(command=cmd,
dependencies=deps,
label=lbl,
nCores=n_cores))
''' '''
' ################################################## ' ##################################################
' # cleanup # ' # cleanup #
@ -362,9 +324,6 @@ class OCRPipeline(WorkflowRunner):
for i, job in enumerate(self.jobs): for i, job in enumerate(self.jobs):
input_dir = os.path.join(job.output_dir, 'tmp') input_dir = os.path.join(job.output_dir, 'tmp')
cmd = 'rm -r "{}"'.format(input_dir) cmd = 'rm -r "{}"'.format(input_dir)
if self.compress:
deps = ['pdf_compression_-_{}'.format(i)]
else:
deps = ['combined_pdf_creation_-_{}'.format(i)] deps = ['combined_pdf_creation_-_{}'.format(i)]
deps.append('combined_txt_creation_-_{}'.format(i)) deps.append('combined_txt_creation_-_{}'.format(i))
deps.append('poco_bundle_creation_-_{}'.format(i)) deps.append('poco_bundle_creation_-_{}'.format(i))
@ -395,8 +354,7 @@ class OCRPipeline(WorkflowRunner):
cmd += ' -i "*.pdf" "*.txt" "*.xml" "*.hocr" "*.{}"'.format('bin.png' if self.binarize else 'tif') # noqa cmd += ' -i "*.pdf" "*.txt" "*.xml" "*.hocr" "*.{}"'.format('bin.png' if self.binarize else 'tif') # noqa
cmd += ' && ' cmd += ' && '
cmd += 'cd -' cmd += 'cd -'
deps = (pdf_compression_jobs if self.compress else deps = combined_pdf_creation_jobs
combined_pdf_creation_jobs)
deps += combined_txt_creation_jobs deps += combined_txt_creation_jobs
deps += poco_bundle_creation_jobs deps += poco_bundle_creation_jobs
lbl = 'zip_creation_-_all' lbl = 'zip_creation_-_all'
@ -413,8 +371,7 @@ class OCRPipeline(WorkflowRunner):
cmd += ' -i "*.pdf"' cmd += ' -i "*.pdf"'
cmd += ' && ' cmd += ' && '
cmd += 'cd -' cmd += 'cd -'
deps = (pdf_compression_jobs if self.compress else deps = combined_pdf_creation_jobs
combined_pdf_creation_jobs)
lbl = 'zip_creation_-_pdf' lbl = 'zip_creation_-_pdf'
zip_creation_jobs.append(self.addTask(command=cmd, zip_creation_jobs.append(self.addTask(command=cmd,
dependencies=deps, dependencies=deps,
@ -482,8 +439,7 @@ def main():
args = parse_args() args = parse_args()
jobs = collect_jobs(args.input_directory, args.output_directory) jobs = collect_jobs(args.input_directory, args.output_directory)
ocr_pipeline = OCRPipeline(args.binarize, jobs, args.language, ocr_pipeline = OCRPipeline(args.binarize, jobs, args.language,
args.n_cores, args.output_directory, args.zip, args.n_cores, args.output_directory, args.zip)
args.compress)
retval = ocr_pipeline.run( retval = ocr_pipeline.run(
dataDirRoot=(args.log_dir or args.output_directory), dataDirRoot=(args.log_dir or args.output_directory),
nCores=args.n_cores nCores=args.n_cores