[BUG] PDFOCRLoader无法将pdf中的图片加载为文字 about langchain-chatchat HOT 2 CLOSED

It sounds like the PDFOCRLoader is not converting images in a PDF to text as expected. Here are some steps to troubleshoot and potentially resolve the issue:

1. Check Dependencies: Ensure that fitz (PyMuPDF) and OpenCV libraries are installed. These are essential for processing PDF files and images. Install them using:

   pip install pymupdf
   pip install opencv-python-headless

2. Image Quality: The OCR's accuracy can be affected by the image quality in the PDF. Low-quality images may not be converted accurately.

3. OCR Threshold: The PDF_OCR_THRESHOLD setting determines which images are processed based on their size relative to the page. Adjusting these values in configs/kb_config.py.example might help if your images are not being recognized due to their size.

4. Rotation Handling: Ensure that image rotation is correctly handled before OCR processing. Incorrect rotation can lead to recognition errors.

5. OCR Engine Setup: Verify that the OCR engine is correctly set up and functioning. Issues with the OCR engine can prevent successful image to text conversion.

If you're encountering specific error messages or if the images within the PDF are of a particular quality or size, providing more details could help in identifying a more specific solution.

To continue the conversation, mention @dosu.

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这个issue似乎应该去ocr提

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