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text_extractor.py
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text_extractor.py
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"""Extracts kanji from images (repurposed and modified code from Mokuro)."""
import re
import os
import zipfile
import tempfile
from tqdm import tqdm
from mokuro.manga_page_ocr import MangaPageOcr
def is_kanji(character):
"""Check whether a character is kanji."""
kanji_pattern = re.compile(r'[\u4e00-\u9faf]')
return bool(kanji_pattern.match(character))
class TextExtractor:
"""Contains code for text extraction."""
def __init__(self, pretrained_model_name_or_path='kha-white/manga-ocr-base', force_cpu=False, **kwargs):
"""Mokuro settings."""
self.pretrained_model_name_or_path = pretrained_model_name_or_path
self.force_cpu = force_cpu
self.kwargs = kwargs
self.mpocr = None
def init_models(self):
"""Check OCR settings."""
if self.mpocr is None:
self.mpocr = MangaPageOcr(self.pretrained_model_name_or_path, self.force_cpu, **self.kwargs)
def extract_kanji(self, result):
"""Add kanji to array."""
kanji_list = []
for block in result['blocks']:
for line in block['lines']:
for character in line:
if is_kanji(character):
kanji_list.append(character)
return kanji_list
def process_image(self, img_path):
"""Run OCR on image."""
self.init_models()
result = self.mpocr(img_path)
return self.extract_kanji(result)
# LINUX / WSL
def process_cbz(self, cbz_path):
"""Loops through .cbz file, creating tempfile for each page."""
kanji_array = []
with zipfile.ZipFile(cbz_path, 'r') as cbz_file:
for page in tqdm(cbz_file.namelist(), desc='processing pages...'):
if page.lower().endswith(('.jpg', '.jpeg', '.png', '.gif')):
image_data = cbz_file.read(page)
with tempfile.NamedTemporaryFile(suffix=os.path.splitext(page)[1], delete=True) as temp_image_file:
temp_image_file.write(image_data)
kanji_list = self.process_image(temp_image_file.name)
kanji_array.extend(kanji_list)
return set(kanji_array)