Update README.md

README.md

@@ -6,49 +6,71 @@ license: cc-by-4.0
 
 We present Intrinsics in Flux (InFlux), a real-world benchmark that provides per-frame ground truth intrinsics annotations for videos with dynamic intrinsics. Compared to prior benchmarks, InFlux captures a wider range of intrinsic variations and scene diversity, featuring 143K+ annotated frames from 386 high-resolution indoor and outdoor videos with dynamic camera intrinsics.  
 
-For more information about this dataset and to enter a submission for the benchmark, please visit our website: https://influx.cs.princeton.edu/.
+For more information about this dataset, plase visit our website: https://influx.cs.princeton.edu/. Please find the download and submission instructions in the [official repository](https://github.com/princeton-vl/InFlux/tree/main).
 
-Instructions on how to use the dataset are given below.
 
-### Viewing the mp4s
+### Viewing `.mp4` Files
 
-The mp4s in this dataset require VLC media viewer to play locally. Please download VLC [here](https://www.videolan.org/).
+The `.mp4` files in this dataset require VLC media viewer to play locally. Please download VLC [here](https://www.videolan.org/).
 
 ### Dataset Structure
 
-The dataset includes 386 mp4 videos and 2 JSON files in the root directory:
+The dataset includes 386 `.mp4` videos and 2 `.json` files in the root directory:
 
-- **Dynamic Intrinsics Videos (386 mp4 files)**: Videos with dynamic intrinsics and other arbitrary camera motions.
+- **Dynamic Intrinsics Videos (`.mp4`)**  
+  Videos with dynamic intrinsics, moving objects, and camera motion.  
 
-- **Frame counts and Val-Test Split (1 JSON file: `video_frame_count_and_split.json`)**: JSON file mapping video names to the number of frames in the mp4 and whether this video is in the validation or test split.
+- **Frame Counts and Split (`video_frame_count_and_split.json`)**  
+  Maps each video to its number of frames and whether it belongs to the validation or test split.  
 
-- **Validation Ground Truth (1 JSON file: `gt_validation_dict.json`)**: JSON file mapping validation video frames to ground truth intrinsics values.
+- **Validation Ground Truth (`gt_validation_dict.json`)**  
+  Maps validation video frames to ground truth intrinsics values.
 
 ---
 
 ### JSON File Structures
 
-- **`video_frame_count_and_split.json`**:
-  - Video name (e.g. `video_shot_1`)
-    - `frame_count` – How many frames in the mp4.
-    - `split` – Does this video belong in the validation or test split.
-
-- **`gt_validation_dict.json`**:
-  - Video name (e.g. `video_shot_1`)
-    - Frame number (e.g. 0)
-      - `intrinsics_gt` – Ground truth intrinsics interpolated from the Look-Up Table (LUT).
-        - `fx`
-        - `fy`
-        - `cx`
-        - `cy`
-        - `k1`
-        - `k2`
-        - `p1`
-        - `p2`
-      - `intrinsics_gt_extrapolated` – Intrinsics extrapolated from the LUT, used if lens metadata exceeds LUT bounds.
-        - [Same as `intrinsics_gt`]
-      - `lens_metadata` – Physical lens values.
-        - `focal_length_mm`
-        - `focus_distance_m`
-    - Frame number (e.g. 1)
-    - ...
+#### `video_frame_count_and_split.json`
+
+```json
+{
+    "video_shot_1": {
+        "frame_count": 1234,
+        "split": "val"
+    }
+}
+```
+
+- `frame_count` – Number of frames in the video.
+
+- `split` – Denotes which split the video belongs in. The value will either be "val" or "test".
+
+#### `gt_validation_dict.json`
+
+```json
+{
+    "video_shot_1": {
+        "0": {
+            "intrinsics_gt": {
+                "fx": ..., "fy": ..., "cx": ..., "cy": ...,
+                "k1": ..., "k2": ..., "p1": ..., "p2": ...
+            },
+            "intrinsics_gt_extrapolated": { ... },
+            "lens_metadata": {
+                "focal_length_mm": ...,
+                "focus_distance_m": ...
+            }
+        },
+        "1": { ... },
+        ...
+    }
+}
+```
+
+**Per-frame keys:**
+- `intrinsics_gt` – Ground truth intrinsics from look-up table (LUT) interpolation.
+    - `fx, fy, cx, cy, k1, k2, p1, p2` denote the intrinsics parameters as specified by the rad-tan Brown-Conrady distortion model.
+
+- `intrinsics_gt_extrapolated` – The same as `intrinsics_gt`, but also provides extrapolated intrinsics if lens metadata is outside of LUT bounds. It contains the same fields as `intrinsics_gt`.
+
+- `lens_metadata` – Raw physical lens parameters `focal_length_mm`, `focus_distance_m`