James R. Barlow
2c24f67deb
Tesseract 3.05.01 backported the textonly_pdf=1 which allows the use of this superior PDF renderer prior to 4.00 alpha. This means that the tess4 name is no longer accurate, so call it a sandwich because of its merge-preserve characteristic. Preserve the tess4 name. Fix the documentation and tests to reflect this. Make it the default, because it’s better. It does not have the issues the “tesseract” renderer does prior to Tess 3.05.00 with rendering PDFs that Ghostscript corrupts, and it produces better output without re-rastering. Deprecate some old stuff to avoid the test suite growing obscenely large.
109 lines
3.5 KiB
Python
Executable File
109 lines
3.5 KiB
Python
Executable File
#!/usr/bin/env python3
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# © 2016 James R. Barlow: github.com/jbarlow83
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import sys
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import img2pdf
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import PyPDF2 as pypdf
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from PIL import Image
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"""Tesseract no-op spoof
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To quickly run tests where getting OCR output is not necessary.
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In 'hocr' mode, create a .hocr file that specifies no text found.
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In 'pdf' mode, convert the image to PDF using another program.
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In orientation check mode, report the orientation is upright.
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"""
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VERSION_STRING = '''tesseract 3.05.01
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leptonica-1.72
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libjpeg 8d : libpng 1.6.19 : libtiff 4.0.6 : zlib 1.2.5
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SPOOFED
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'''
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HOCR_TEMPLATE = '''<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title></title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name='ocr-system' content='tesseract 3.02.02' />
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<meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
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</head>
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<body>
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<div class='ocr_page' id='page_1' title='image "x.tif"; bbox 0 0 {0} {1}; ppageno 0'>
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<div class='ocr_carea' id='block_1_1' title="bbox 0 1 {0} {1}">
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<p class='ocr_par' dir='ltr' id='par_1' title="bbox 0 1 {0} {1}">
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<span class='ocr_line' id='line_1' title="bbox 0 1 {0} {1}"><span class='ocrx_word' id='word_1' title="bbox 0 1 {0} {1}"> </span>
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</span>
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</p>
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</div>
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</div>
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</body>
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</html>'''
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def main():
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if sys.argv[1] == '--version':
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print(VERSION_STRING, file=sys.stderr)
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sys.exit(0)
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elif sys.argv[1] == '--list-langs':
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print('List of available languages (1):\neng', file=sys.stderr)
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sys.exit(0)
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elif sys.argv[1] == '--print-parameters':
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print("Some parameters", file=sys.stderr)
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print("textonly_pdf\t1\tSome help text")
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sys.exit(0)
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elif sys.argv[-2] == 'hocr':
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inputf = sys.argv[-4]
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output = sys.argv[-3]
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with Image.open(inputf) as im, \
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open(output + '.hocr', 'w', encoding='utf-8') as f:
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w, h = im.size
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f.write(HOCR_TEMPLATE.format(str(w), str(h)))
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with open(output + '.txt', 'w') as f:
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f.write('')
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elif sys.argv[-2] == 'pdf':
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if 'textonly_pdf=1' in sys.argv:
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inputf = sys.argv[-4]
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output = sys.argv[-3]
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with Image.open(inputf) as im:
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dpi = im.info['dpi']
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imsize = im.size[0] * dpi[0] / 72, im.size[1] * dpi[1] / 72
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pdf_out = pypdf.PdfFileWriter()
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pdf_out.addBlankPage(imsize[0], imsize[1])
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with open(output + '.pdf', 'wb') as f:
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pdf_out.write(f)
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with open(output + '.txt', 'w') as f:
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f.write('')
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else:
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inputf = sys.argv[-4]
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output = sys.argv[-3]
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pdf_bytes = img2pdf.convert([inputf], dpi=300)
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with open(output + '.pdf', 'wb') as f:
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f.write(pdf_bytes)
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with open(output + '.txt', 'w') as f:
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f.write('')
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elif sys.argv[-1] == 'stdout':
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inputf = sys.argv[-2]
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print("""Orientation: 0
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Orientation in degrees: 0
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Orientation confidence: 100.00
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Script: 1
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Script confidence: 100.00""", file=sys.stderr)
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else:
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print("Spoof doesn't understand arguments", file=sys.stderr)
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print(sys.argv, file=sys.stderr)
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sys.exit(1)
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sys.exit(0)
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if __name__ == '__main__':
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main()
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