Four new extraction research documents covering PDF article thread
traversal for multi-flow magazine layouts, resource dictionary
inheritance and ResourceStack semantics for nested Form XObjects,
document catalog and page tree structure (UserUnit, Contents array,
page inheritance), and hyperlink/named destination extraction with
QuadPoints anchor text and link density classification.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four new extraction research documents covering cross-reference table
and xref stream parsing with error recovery, PDF object model and lexer
correctness (all 8 types, string escapes, stream /Length recovery),
FontDescriptor fields and embedded font data (Type1/TrueType/CFF/OT),
and PDF/UA-2 / PDF 2.0 structure changes (MathML, NFC normalization,
new structure types, artifact classification improvements).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four new extraction research documents covering ICC profile and color
space luminance estimation for text visibility, precise text state
tracking and bounding box computation (Tc/Tw/Tz/TL, font units, TJ
kerning, baseline clustering), PDF/X prepress handling (OutputIntent,
TrimBox, spot colors, article threading), and a complete content stream
operator reference (BT/ET, Tj/TJ/'/", BI/ID/EI, BX/EX, marked content).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four new extraction research documents covering page label/PageLabels
number tree and outline/bookmark tree extraction, government form PDF
patterns (IRS, USCIS, court filings, classification markings), book and
publishing PDF structure (running heads, footnotes, index extraction),
and PDF stream filter pipeline (FlateDecode/LZW predictors, JBIG2 global
segments, CCITTFax, JPX, error boundaries).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four new extraction research documents covering PDF portfolio and
attachment enumeration (ZUGFeRD, PDF/A-3 AFRelationship), incremental
update structure and xref chaining, PDF/UA tagged PDF deep dive with
all 36 structure types and MCID mechanics, and JavaScript/AcroForm/XFA
field extraction without script execution.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four new extraction research documents covering color space and contrast
analysis for text visibility, medical/scientific document structure
(ICH E3, IMRaD, FDA labeling, eCTD), multilingual mixed-script extraction
with UBA bidi handling and CJK vertical text, and digital signature
metadata extraction with DocMDP integrity context.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four new extraction research documents covering text rendering modes
(Tr 0-7 including invisible OCR layers), legal/financial document
extraction patterns, character-level confidence aggregation with output
schema, and PDF/E engineering document handling (CAD, GD&T, schematics).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Three new extraction research documents covering subset font Unicode
recovery, pdfLaTeX/XeLaTeX encoding tables and two-column layout, and
proper vs. improper redaction detection with output schema.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- word-boundary-reconstruction: expected position formula with Tc/Tw/Tz,
TJ kerning gap detection, Td/Tm jump analysis, four space-width threshold
strategies including adaptive histogram, multi-column gap discrimination
- scanned-vs-vector-page-classification: four-category taxonomy, fast
pre-checks, image coverage AABB computation, character density ratio,
validity rate, glyph bbox plausibility, region routing map, confidence
scoring with cost-aware OCR threshold
- pdfa-compliance-and-extraction: ISO 19005 part/level matrix, XMP
pdfaid detection, Level B/U/A guarantee implications for extraction,
font embedding requirements, artifact tagging, PDF/A-3 embedded files,
PdfaLevel enum with per-level fast-path branching
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Covers TypeScript, C#, C++, PHP, and Kotlin gaps with full code examples
for both subprocess and HTTP tracks, NuGet RID packaging detail, PHP FFI
options, and implementation sequencing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four research documents covering PDF spec fundamentals, font types and
encoding, glyph Unicode recovery, and tagged PDF structure/reading order.
SDK invocation notes with subprocess and HTTP examples for Python, Node.js,
Go, Ruby, Java, Rust, and Bash.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
