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https://github.com/ocrmypdf/OCRmyPDF.git
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bbd263ff48
- Add hOCR test fixtures for Latin, Arabic, CJK, Devanagari scripts - Add tests for fpdf2 renderer, multi-font manager, system font provider - Add multilingual rendering tests - Update existing tests to use fpdf2 renderer
99 lines
3.0 KiB
Python
99 lines
3.0 KiB
Python
# SPDX-FileCopyrightText: 2022 James R. Barlow
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# SPDX-License-Identifier: MIT
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"""Tesseract no-op/fixed rotate plugin.
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To quickly run tests where getting OCR output is not necessary and we want to test
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the rotation pipeline.
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In generate_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 0, 90, 180, 270... based on page number.
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"""
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from __future__ import annotations
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import pikepdf
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from PIL import Image
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from ocrmypdf import OcrEngine, OrientationConfidence, hookimpl
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from ocrmypdf.helpers import page_number
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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 4.1.1' />
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<meta name='ocr-capabilities'
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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}">
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<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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class FixedRotateNoopOcrEngine(OcrEngine):
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@staticmethod
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def version():
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return '4.1.1'
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@staticmethod
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def creator_tag(options):
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tag = '-PDF' if options.pdf_renderer == 'sandwich' else '-hOCR'
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return f"NO-OP {tag} {FixedRotateNoopOcrEngine.version()}"
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def __str__(self):
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return f"NO-OP {FixedRotateNoopOcrEngine.version()}"
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@staticmethod
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def languages(options):
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return {'eng'}
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@staticmethod
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def get_orientation(input_file, options):
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page = page_number(input_file)
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angle = ((page - 1) * 90) % 360
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return OrientationConfidence(angle=angle, confidence=99.9)
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@staticmethod
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def generate_hocr(input_file, output_hocr, output_text, options):
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with (
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Image.open(input_file) as im,
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open(output_hocr, 'w', encoding='utf-8') as f,
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):
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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_text, 'w') as f:
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f.write('')
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@staticmethod
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def generate_pdf(input_file, output_pdf, output_text, options):
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with Image.open(input_file) as im:
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dpi = im.info['dpi']
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pagesize = im.size[0] / dpi[0], im.size[1] / dpi[1]
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ptsize = pagesize[0] * 72, pagesize[1] * 72
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pdf = pikepdf.new()
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pdf.add_blank_page(page_size=ptsize)
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pdf.save(output_pdf, static_id=True)
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output_text.write_text('')
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@hookimpl
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def get_ocr_engine():
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return FixedRotateNoopOcrEngine()
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