Update README.md

README.md

@@ -1,4 +1,20 @@
 ---
 license: mit
 ---
-Dataset release
+
+
+```json
+"bbox": [x, y, w, h]
+```
+
+| Field | Description |
+|-------|-------------|
+| `x`   | Left edge of the bounding box (normalized 0–1) |
+| `y`   | Top edge of the bounding box (normalized 0–1) |
+| `w`   | Width of the bounding box (normalized 0–1) |
+| `h`   | Height of the bounding box (normalized 0–1) |
+
+- **Origin:** upper-left corner of the image is (0, 0).
+- **Reference frame:** 512x512 center-cropped image (resize shortest side to 512, then center crop).
+
+