How Do Document Parsers Break? Auditing Structural Vulnerability in Document Intelligence

In three linesRobustness study of Document Layout Analysis (DLA) pipelines used in RAG and long-document QA. Authors identify footprint bias and propose a lightweight auditing framework measuring block-level structural loss (B-SLR). On 1,000 pages with MinerU and PP-StructureV3, B-SLR correlates better with OCR instability (R²=0.727/0.916) than area-based metrics (R²=0.384/0.110).

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