从文档中删除文本，只留下模板

我使用 doctr 库来识别文本并获取 pdf 文档中文本的坐标。但是，我根本不需要此文档中的文本，只需要文档模板。

我正在寻找如何删除文本的解决方案，并决定最好遍历获得的坐标并删除这些坐标内的文本。

我开始研究如何在 Python 中实现这一点。不幸的是，信息不多，但我设法找到了这个视频 https://www.youtube.com/watch?v=3RNPJbUHZKs 这个原则对我来说更加清晰，并且我尝试去实现它。但问题是：

1. 该视频使用 keras_ocr 进行文本识别，x 和 y 坐标采用不同的数据格式，与坐标来自 doctr 的格式不同
2. 当视频中有大量文本时文档（通常超过 100 项），程序运行时间超过 10 分钟。如您所知，这很长。

关于坐标：

1. 在 doctr 中，点 (0,0) 位于左上角。
2. 我收到的文本坐标的格式为 ((x1, y1),(x2,y2)。其中x1,y1是识别出的单词的左上点，x2,y2是识别出的单词的右下点。

下面我以这个文件为例| ||我通过 doctr 运行此文档。生成的文件将包含单词和相应的坐标，因此我将它们提取到一个单独的列表中

如您所见，这是一个非常大的列表。坐标，主要问题是视频中的算法运行缓慢也许你可以告诉我如何解决我的问题。

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也就是说，在输出处，我想收到这样的文件。

That is, at the output, I would like to receive a file like this

当然，我可以帮你实现这个目标。下面是你可以用来从PDF文档中移除文本，只留下空白模板的Python代码：

import fitz

def redact_words(pdf_path, coordinates):
  """
  移除PDF文档中指定坐标处的文字。

  参数：
    pdf_path: PDF文档的路径
    coordinates: 要移除的文字坐标列表。每个坐标应为 ((x1, y1), (x2, y2)) 格式，
                 其中 (x1, y1) 是文字左上角的坐标，(x2, y2) 是文字右下角的坐标。
  """

  doc = fitz.open(pdf_path)

  for page in doc:
    for x1, y1, x2, y2 in coordinates:
      rect = fitz.Rect(x1, y1, x2, y2)
      page.add_redact_annot(rect, fill=(1, 1, 1)) # 使用白色填充矩形以遮盖文字

    page.apply_redact()

  redacted_pdf_path = pdf_path.replace(".pdf", "_redacted.pdf")
  doc.save(redacted_pdf_path)
  print(f"已保存移除文字后的文档：{redacted_pdf_path}")

# 使用方法示例
coordinates = [((50.66015624999998, 179.25390625), (96.70703124999997, 198.98828125)), 
            # ... 其他坐标 ...
           ]

pdf_path = "path/to/your.pdf"  # 替换为你的PDF文档路径
redact_words(pdf_path, coordinates)

代码说明：

1. 导入 fitz 库:
2. 确保你已经安装了 PyMuPDF 库。可以使用 pip install pymupdf 命令进行安装。
3. 定义 redact_words 函数:
4. 接收PDF文档路径和文字坐标列表作为输入。
5. 使用 fitz.open(pdf_path) 打开PDF文档。
6. 遍历文档中的每一页。
7. 对于每一组坐标：
   • 创建一个 fitz.Rect 对象，表示要移除的文字区域。
   • 使用 page.add_redact_annot(rect, fill=(1, 1, 1)) 在文字区域添加一个白色的矩形遮罩。
   • 使用 page.apply_redact() 应用遮罩，移除文字。
8. 保存移除文字后的PDF文档。

使用方法：

1. 将示例代码中的 coordinates 列表替换为从 doctr 库中获取的文字坐标列表。
2. 将 pdf_path 变量替换为你的PDF文档路径。
3. 运行代码，它将会创建一个名为 "your_redacted.pdf" 的新PDF文档，其中所有指定坐标处的文字都将被移除。

优化建议：

• 为了提高代码的效率，可以考虑使用多线程或异步处理来并行处理多个页面或文字区域。

希望这可以帮到你！