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pdf-analysis

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PDF 文档解析。自动区分文字型 PDF 与扫描型 PDF，覆盖：文本/表格提取、多页全量扫描、嵌入图表 caption、单位感知数值计算。

skills/sn-da-non-spreadsheet-analysis/capability/pdf-analysis/SKILL.md

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# PDF Analysis

## Step 0 — Detect PDF type (text vs scanned)

**Critical first step**: determine whether the PDF has extractable text or is a scanned image.
Never skip this — using the wrong parser wastes time and produces empty results.

```python
import fitz  # PyMuPDF

def detect_pdf_type(pdf_path, sample_pages=3):
    """
    Returns 'text' if PDF has extractable text, 'scanned' if image-based.
    Checks first N pages (or all if fewer).
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