Unverified50% confidenceFactExact time
双栏PDF中多数提取器按行从上到下工作，导致左栏第一行后紧跟右栏第一行，分块混入两段无关内容。
1
Sources
50%
Confidence
Long-term
Relevance
10/17/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedStandard PDF text extractors typically sort text objects from top to bottom along the Y-axis and from left to right along the X-axis before concatenating them; in multi-column layouts, this mixes text from the left and right columns, causing semantic order to become garbled.75% similarVerifiedThe text stream in document formats such as PDF is not always stored in visual order; multi-column layouts, mixed text and image arrangements, and interleaved footnotes and headers can cause the underlying text stream to be misaligned with visual order.67% similarUnverifiedFor two-column pages, XY-cut separates the left and right columns with the first cut; its drawbacks are sensitivity to borderless tables, rotated text and complex magazine layouts, and the gap threshold must be tuned per document.66% similarUnverifiedWith traditional fixed-length chunking, inserting one byte at the beginning of a file causes the start and end positions of all subsequent chunks to shift right entirely, invalidating all fingerprints.65% similar
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