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When a book scan (double-page spread) is detected during the crop step, the system automatically: 1. Detects vertical center gaps (spine area) via ink density projection 2. Splits into N page sub-sessions (reusing existing sub-session mechanism) 3. Individually crops each page (removing its own borders) 4. Returns sub-session IDs for downstream pipeline processing Detection: landscape images (w > h * 1.15), vertical gap < 15% peak density in center region (25-75%), gap width >= 0.8% of image width. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>