- **Injury Criteria**: auto-detect channels by ISO naming, compute HIC15/3ms clip/Nij/chest defl/femur/tibia, protocol scoring (Euro NCAP/US NCAP/IIHS) with color-coded results and star ratings
- **Math Expression Builder**: formula input, 3 variable bindings (a/b/c mapped to channel dropdowns), result injected into test data and auto-plotted
- **Template Management**: library browser, apply (resolves channel patterns + sets CFC), save current view as template, delete, session auto-save
- **Corridors**: CSV upload (time/lower/upper), rendered as filled band on plot
- **Export**: CSV of plotted data (with transforms), PNG/SVG/PDF buttons, protocol report generation
**Consistent Color System:**
Every selected channel has a stable color index (position in selection order). The same color appears in:
- Plot traces
- Channel grid rows (tinted background + solid left border)
Informed by competitive landscape survey (`research/landscape.md`). No open-source web-based tool covers this domain end-to-end. See `BRAINSTORM.md` for full feature ideas with priority tiers.
### Priority 3 — Performance & Rendering
Goal: handle large datasets (500+ channels, 100kHz sample rates) without lag.
1.**plotly-resampler integration** -- Drop-in `FigureResampler` wrapper for Plotly figures. Handles 110M+ points via LTTB downsampling. Works natively with Dash. Repo cloned at `research/repos/plotly-resampler/`. This is the single highest-impact performance improvement.
2.**Synchronized zoom/pan** -- When plotting multiple subplots, zoom/pan syncs across all panes sharing an X axis. Most-requested feature in crash test visualization. Implement via shared `xaxis` config or callback-based range sync.
3.**Lazy channel loading** -- Load `.dat` files on first access, not at `Session.open()`. Load headers eagerly, data lazily. Keeps startup fast for tests with 500+ channels.
4.**Channel sparklines** -- Tiny inline sparklines in the channel grid sidebar. Engineers visually scan 100+ channels before selecting. A 60px-wide sparkline column is transformative for signal browsing.
### Priority 4 — Data Format Expansion
Goal: read the world's crash test data, not just ISO MME.
5.**UDS reader plugin** -- NHTSA's proprietary binary format. Required to access the largest public crash test database. The NHTSA-Tools Fortran source (`research/repos/NHTSA-Tools/`) documents the UDS spec.
6.**ASAM MDF reader plugin** -- Standard for ECU/CAN bus measurement data. Many labs record vehicle bus data alongside crash instrumentation. asammdf (`research/repos/asammdf/`) is a mature library — add as optional dependency.
7.**Flexible CSV reader** -- Column mapping, delimiter detection, header conventions. Engineers frequently receive data as CSV exports from other tools.
### Priority 5 — Comparison & Reporting
Goal: make multi-test comparison and deliverable generation effortless.
8.**Quick comparison mode** -- Two tests side-by-side with synchronized cursors. One-click "compare" button. Color-by-test with channel differentiation via line dash.
9.**Multi-page PDF reports** -- Combine plots + injury summary + protocol rating into a single PDF with table of contents. Currently each report type is standalone.
10.**Excel export** -- Criteria results and cursor values to .xlsx. Engineers live in spreadsheets.
11.**Static HTML export** -- Bundle data + Plotly.js into a self-contained HTML file. Opens in any browser without a Python server. Learned from FalCon's CustomerView distribution model.
### Priority 6 — Video & Advanced Analysis
Goal: close the biggest remaining gap vs. commercial tools.
12.**Video synchronization** -- Link high-speed camera footage with channel data. Scrubbing video moves the time cursor; moving the cursor seeks the video. Every major commercial competitor (measX, DIAdem, Kistler, FalCon) has this. Foxglove and Rerun demonstrate web-native approaches.
Goal: bridge the gap between physical test and CAE simulation.
16.**LS-DYNA data import** via lasso-python (`research/repos/lasso-python/`). Enables test-vs-simulation overlay — a premium feature in Altair HyperGraph and Siemens Simcenter.
17.**ISO/TS 18571 CORA correlation** -- Quantitative rating of test-vs-simulation agreement. Standard metric for model validation.
18.**Additional injury criteria** -- BrIC, DAMAGE, TTI, pedestrian criteria, OLC. Required for broader Euro NCAP coverage.
19.**Additional NCAP programs** -- J-NCAP, C-NCAP, K-NCAP, ANCAP, Latin NCAP as protocol plugins.
20.**Jupyter integration** -- `_repr_html_` on Session, Channel, ProtocolResult for rich notebook output.
### Validation (ongoing)
- **Cross-validate CFC filter** against PyAvia's J211_2pole (`research/repos/pyavia/`) and NHTSA-Tools' BwFilt. PyAvia's author notes that scipy's generic `sosfiltfilt` may differ from the SAE J211 Appendix C digital Butterworth algorithm for CFC 60 and 180.
- **Cross-validate injury criteria** against NHTSA-Tools Fortran reference implementations, pyisomme, and EPFL crash-tests-service-robots. Four independent codebases available in `research/repos/`.
6.**CFC filter implementation** uses scipy `sosfiltfilt` which may diverge from SAE J211 Appendix C for CFC 60/180. Needs cross-validation against PyAvia and NHTSA-Tools reference implementations.
