Add dataset card

README.md

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+---
+license: cc-by-4.0
+task_categories:
+- image-classification
+tags:
+- magic-the-gathering
+- card-identification
+- temporal-eval
+---
+
+# Sol Ring Eval Dataset
+
+A temporal evaluation benchmark for Magic: The Gathering card identification,
+specifically designed to measure how **multi-frame rolling-buffer** approaches
+compare to single-frame identification.
+
+## What's in it
+
+- **308 frames** from 22 distinct Sol Ring printings (editions), drawn from
+  21 short phone-camera videos.
+- Each edition is its own video; frames within a video are temporally ordered
+  by `frame_number` (spaced ~60 source frames ≈ 1–2 seconds apart at 30 fps).
+- `corners.csv` provides per-frame homography-verified card corner coordinates
+  (normalized 0–1), a sharpness proxy (`num_good_matches`), and the ground-truth
+  `card_id` (Scryfall UUID) and `set_code`.
+
+## File layout
+
+```
+corners.csv          308-row metadata file (see schema below)
+data/frames/*.jpg    source JPEG frames (pre-dewarped, camera perspective intact)
+```
+
+## corners.csv schema
+
+| Column | Type | Description |
+|---|---|---|
+| `img_path` | str | Path relative to repo root (`data/frames/{filename}`) |
+| `card_id` | str | Scryfall UUID — ground-truth card identity |
+| `set_code` | str | Set abbreviation parsed from filename (e.g. `khc`) |
+| `frame_number` | int | Frame index within the source video — establishes temporal order |
+| `corner0_x` … `corner3_y` | float | Homography-detected card corners, normalized 0–1 |
+| `num_good_matches` | int | SIFT inlier count — proxy for detection confidence |
+| `matching_area_pct` | float | Fraction of reference card area matched |
+
+## Intended use
+
+Simulate a live-camera feed per edition:
+
+```python
+from collections import deque
+from datasets import load_dataset
+
+ds = load_dataset("HanClinto/solring-eval", split="train")
+
+# Group by card_id, sort by frame_number to get temporal sequence
+for card_id, frames in group_by_card(ds):
+    buffer = deque(maxlen=5)
+    for frame in sorted(frames, key=lambda r: r["frame_number"]):
+        emb = embed(dewarp(frame))
+        kept = [e for e in buffer if cosine_sim(emb, e) >= 0.7]
+        search_emb = normalize(mean([emb] + kept)) if kept else emb
+        top1 = gallery_search(search_emb)
+        buffer.append(emb)
+        record(top1 == card_id)
+```
+
+## Edition list (22 printings)
+
+All 22 are distinct Scryfall card IDs for Sol Ring across different sets.
+See `corners.csv` `card_id` + `set_code` columns for the full list.
+
+## License
+
+Images are derivative of Wizards of the Coast card artwork; usage is for
+non-commercial research only. Metadata (corners.csv) is CC BY 4.0.