第一步,装置工具库
1、tika — 用于从各种文件格式中进行文档类型检测和内容提取
2、wand — 基于 ctypes 的简略 ImageMagick 绑定
3、pytesseract — OCR 辨认工具
创立一个虚拟环境,装置这些工具
python -m venv venv source venv/bin/activate pip install tika wand pytesseract
第二步,编写代码
如果 pdf 文件外面既有文字,又有图片,以下代码能够间接辨认文字:
import io import pytesseract import sys from PIL import Image from tika import parser from wand.image import Image as wi text_raw = parser.from_file("example.pdf") print(text_raw['content'].strip())
这还不够,咱们还须要能失败图片的局部:
def extract_text_image(from_file, lang='deu', image_type='jpeg', resolution=300): print("-- Parsing image", from_file, "--") print("---------------------------------") pdf_file = wi(filename=from_file, resolution=resolution) image = pdf_file.convert(image_type) image_blobs = [] for img in image.sequence: img_page = wi(image=img) image_blobs.append(img_page.make_blob(image_type)) extract = [] for img_blob in image_blobs: image = Image.open(io.BytesIO(img_blob)) text = pytesseract.image_to_string(image, lang=lang) extract.append(text) for item in extract: for line in item.split("\n"): print(line)
合并一下,残缺代码如下:
import io import sys from PIL import Image import pytesseract from wand.image import Image as wi from tika import parser def extract_text_image(from_file, lang='deu', image_type='jpeg', resolution=300): print("-- Parsing image", from_file, "--") print("---------------------------------") pdf_file = wi(filename=from_file, resolution=resolution) image = pdf_file.convert(image_type) for img in image.sequence: img_page = wi(image=img) image = Image.open(io.BytesIO(img_page.make_blob(image_type))) text = pytesseract.image_to_string(image, lang=lang) for part in text.split("\n"): print("{}".format(part)) def parse_text(from_file): print("-- Parsing text", from_file, "--") text_raw = parser.from_file(from_file) print("---------------------------------") print(text_raw['content'].strip()) print("---------------------------------") if __name__ == '__main__': parse_text(sys.argv[1]) extract_text_image(sys.argv[1], sys.argv[2])
第三步,执行
如果 example.pdf 是这样的:
在命令行这样执行:
python run.py example.pdf deu | xargs -0 echo > extract.txt
最终 extract.txt 的后果如下:
-- Parsing text example.pdf -- --------------------------------- Title pure text Content pure text Slide 1 Slide 2 --------------------------------- -- Parsing image example.pdf -- --------------------------------- Title pure text Content pure text Title in image Text in image
你可能会问,如果是简体中文,那个 lang 参数传递什么,传 ‘chi_sim’,其实是有官网阐明的,链接如下:
https://github.com/tesseract-…
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