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""" Package to convert PDF to PNG |
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.. Authors: |
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Philippe Dessauw |
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[email protected] |
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.. Sponsor: |
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Alden Dima |
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[email protected] |
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Information Systems Group |
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Software and Systems Division |
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Information Technology Laboratory |
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National Institute of Standards and Technology |
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http://www.nist.gov/itl/ssd/is |
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""" |
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from os import listdir |
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from os.path import join, isfile, dirname, splitext, basename, isdir |
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import PyPDF2 |
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import PythonMagick |
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from pipeline.command import Command |
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class PDFConverter(Command): |
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""" Command to convert PDF to PNG. |
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""" |
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def __init__(self, filename, logger, config): |
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super(PDFConverter, self).__init__(filename, logger, config) |
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self.density = config["command"]["density"] |
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self.depth = config["command"]["depth"] |
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self.quality = config["command"]["quality"] |
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self.logger.debug("PDF converter {density: "+str(self.density) |
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+ "; depth: "+str(self.depth) |
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+ "; quality: "+str(self.quality) + "}") |
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def execute(self): |
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""" Execute the command |
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""" |
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self.logger.debug("::: PDF conversion (%s) :::" % str(self.unzipped)) |
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if not isdir(self.unzipped): |
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self.logger.error("%s is not a directory" % self.unzipped) |
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return 2 |
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self.logger.debug("Browsing %s for pdf files..." % self.unzipped) |
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pdf_list = [join(self.unzipped, f) for f in listdir(self.unzipped) |
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if isfile(join(self.unzipped, f)) and f.endswith(".pdf")] |
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if len(pdf_list) != 1: |
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self.logger.error("Incorrect number of PDF file in " + self.unzipped |
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+ " (" + str(len(pdf_list)) + " found, 1 expected)") |
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self.finalize() |
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return 1 |
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filename = str(pdf_list[0]) |
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with open(filename, "rb") as pdf: |
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pdf_filereader = PyPDF2.PdfFileReader(pdf) |
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pdf_page_nb = pdf_filereader.getNumPages() |
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pdf_dirname = dirname(filename) |
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imagesdir = "png" |
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self.logger.debug(str(pdf_page_nb) + " page(s) detected") |
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for p in xrange(pdf_page_nb): |
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try: # Reading the PDF |
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img = PythonMagick.Image() |
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img.density(str(self.density)) |
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img.depth(self.depth) |
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img.quality(self.quality) |
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pdf_page_file = filename + '[' + str(p) + ']' |
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self.logger.debug("Reading " + pdf_page_file + "...") |
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img.read(pdf_page_file) |
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png_dirname = join(pdf_dirname, imagesdir) |
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png_filename = splitext(basename(filename))[0] + '-' + str(p) + '.png' |
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png_page_file = join(png_dirname, png_filename) |
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self.logger.debug("Writing " + png_page_file + "...") |
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img.write(png_page_file) |
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except Exception, e: |
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self.logger.fatal("An exception has been caugth: "+str(e.message)) |
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self.finalize() |
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return 1 |
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self.finalize() |
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return 0 |
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def finalize(self): |
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""" Finalize the job |
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""" |
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# super(PDFConverter, self).store_file() |
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self.logger.debug("::: PDF conversion END (%s) :::" % str(self.unzipped)) |
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usnistgov /
ocr-pipeline
