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estorozhenko
23 lines
2.4 KiB
Markdown
23 lines
2.4 KiB
Markdown
# Vision-reading CAD screenshots — crop & zoom technique
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When the source is a **PNG screenshot of a drawing sheet** (rack/ТШ schematic, port→socket table) instead of a PDF, the vision model reads it directly — but dense sheets need the crop-zoom technique. This reference captures the working pattern from the vinogorod СКС screenshot sessions.
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## Workflow
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1. Probe the sheet size first (`PIL.Image.open().size`). Large sheets (~2300px) read well whole; small ones (~500px) need crops.
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2. Cut the sheet into bands (top/mid/bottom strips, left/right halves, quarters) with `img.crop()`, upscale ×2-4 with `Image.LANCZOS`, save to /tmp.
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3. Send each crop with a **narrow, fact-only question**: "перечисли все подписи по одной на строку, ничего не пропускай". Explicit formatted-single-line output beats "опиши лист".
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4. **Timeout retry pattern**: cloud vision (polza deepseek-vision) times out on dense crops — retry the SAME region as a smaller/narrower crop, or split the question. A timeout is not a dead end; the region is readable in pieces.
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5. Cross-check across crops of the same sheet (top = device labels, bottom = legend/tables); merge answers. Vision text is imperfect — treat "(v) vs (V)", "Swd vs SWd" as the same until proven otherwise.
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6. On engineer sheet sets, the **legend/«Условные графические обозначения» sits at the BOTTOM of each rack sheet** — crop the bottom strip for socket-code decoding. Legends can differ BETWEEN sheets of one set — verify per sheet, never copy from a previous one.
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## Proven example (2026-09-05)
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Sheet `/mnt/vinogorod/ИТ/trash/2026-09-05_08-44-17.png` (2299×1789): bottom strip crop (55-100% height, ×1.6 LANCZOS) exposed the legend tables «Условные графические обозначения», «Маркировка патч-панелей», «Маркировка оборудования в шкафу». Full decode in `sks-rack-legend.md`.
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## Model quirks
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- polza deepseek-vision (~0.1₽/request): fine on large sheets; times out on dense crops → narrow the crop, not the timeout.
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- Small sheets (~500px wide) read worse than large ones; always upscale ×3+ before sending.
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- Split one big "read everything" question into several per-region questions — the model returns cleaner single-line lists.
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## Cross-links
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- Legend decode: `sks-rack-legend.md`
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- Spec/table parsing (PDFs): `spec-parser-pattern.md` |