# 📐 L2 Spec — Digital Image Correlation (DIC) for full-field strain Mismatch-Only Spec
**ID:** `L2-123-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-123`](/artifact/l1/L1-123)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554216
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 512 – 8192 |
| W | px | 512 – 8192 |
| Snr db | dB | 10.0 – 40.0 |
| Pixel um | µm | 1 – 50 |
| Subset px | — | 9 – 81 |
| Out of plane motion | — | 0.0 – 0.3 |
| Speckle size variation | — | 0.0 – 0.3 |
| Camera calibration error | — | 0.0 – 0.05 |
| Illumination non uniformity | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
20.0 + 0.3 * SNR_dB + 0.5 * log2(subset_px / 9) - 8.0 * speckle_size_variation - 6.0 * out_of_plane_motion
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`caf2d5760662c60786ae0814fd5200ed0a498410b2ff39486b24ec2d7ff821db`
## 5. On-chain Registration
- **Chain hash:** `0x95451121791be3cb6496187ce80bdc1490e4151a183e489235b268201ec88ece`
- **Chain tx hash:** `0x0661a8b86919366ac809bd31e030eb5d753ab0753857e46f29a3ee2c20217d03`
- **Chain block:** `41554216`
---
## File Mapping
This bundle consists of: `L2-123-001.md`, `L2-123-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-123-001.md` | Source of truth — edit this | Human or LLM |
| `L2-123-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-123-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._