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| license: cc-by-4.0 |
| task_categories: |
| - object-detection |
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| # CFC26-Mini Dataset Card |
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| ## Dataset Summary |
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| **CFC26-Mini** is a curated sample of the full **CFC26** dataset — a large-scale benchmark for fish detection and counting in underwater ARIS sonar video collected across 9 field locations in North America. This mini version is intended for demonstration purposes. |
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| > **Note:** This is a sample of the full CFC26 dataset. The full dataset contains thousands of clips and hundreds of thousands of annotated frames across all locations and splits. See [Full Dataset](https://huggingface.co/datasets/perona-lab/cfc26/) for details. |
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| ## Dataset Details |
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| | Property | Value | |
| |---|---| |
| | **Task** | Fish detection, counting | |
| | **Annotation format** | COCO JSON (bounding boxes + track IDs) | |
| | **License** | CC BY 4.0 | |
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| ## Sampling Methodology |
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| CFC26-Mini is constructed from the full CFC26 dataset using the following procedure: |
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| - **1 clip** sampled per split (train / val / test) per location |
| - **10 frames** sampled per clip |
| - Only frames containing **at least one fish annotation** are included (positive samples only) |
| - Temporal train/val/test splits are inherited from the full CFC26 dataset splits |
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| ## Dataset Structure |
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| ``` |
| cfc26-mini/ |
| ├── {location}/ |
| │ └── {clip_name}/ |
| │ └── *.png / *.jpg # 3-channel representations (fish-positive only) |
| ``` |
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| Each location directory contains up to 3 clip subdirectories (one per split). Frame filenames encode the clip identity and frame index: |
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| ``` |
| {clip_name}_{frame_index}.png # png and/or jpg |
| ``` |
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| ## Locations |
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| The mini dataset includes samples from the following field sites: |
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| | Location | Region | |
| |---|---| |
| | Chemainus | British Columbia, Canada | |
| | Dungeness | Washington, USA | |
| | Eel | California, USA | |
| | Elwha | Washington, USA | |
| | Channel | Alaska, USA | |
| | Kenai | Alaska, USA | |
| | Rightbank | Alaska, USA | |
| | Klamath | California, USA | |
| | Mad | California, USA | |
| | Nanaimo | British Columbia, Canada | |
| | Nushagak | Alaska, USA | |
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| ## Data Fields |
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| Each frame is a 3-channel representation made up of the raw frame, the background-subtracted frame, and the difference between consecutive background-subtracted frames. Annotations are provided in COCO JSON format alongside the full dataset. |
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| **COCO annotation fields per bounding box:** |
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| | Field | Description | |
| |---|---| |
| | `bbox` | `[x, y, width, height]` in pixels (top-left origin) | |
| | `track_id` | Unique fish identity within a clip | |
| | `category_id` | Fish category (FISH) | |
| | `image_id` | Links to the corresponding frame | |
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| ## Full Dataset |
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| The full **CFC26** dataset contains: |
| - Locations across Alaska, California, Washington, and British Columbia |
| - Thousands of annotated clips spanning multi-week deployments per site |
| - Temporal train/val/test splits designed to evaluate generalization across time |
| - Complete COCO JSON annotations with bounding boxes and track IDs |
| - Per-clip ARIS sonar metadata (frame rate, pixel scale, window parameters) |
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| The full dataset is available at: *(link to be added upon release)* |
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| ## Limitations |
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| - **Positive samples only.** CFC26-Mini contains exclusively fish-positive frames (frames with at least one fish annotation). Empty frames — which constitute a significant portion of the full dataset — are not included. Models trained or evaluated on this mini dataset will not be exposed to the true class imbalance present in real deployments. |
| - **1 clip per split per location.** A single clip is unlikely to be representative of the full temporal and environmental variation within a location. |
| - **10 frames per clip.** Frames are randomly sampled for this demonstration and are not sequential. Temporal context (motion, track continuity) is not preserved. |
| - **Not for benchmarking.** Results on CFC26-Mini are not comparable to results reported on the full CFC26 dataset. Use the full dataset for all benchmark evaluation. |
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| ## Citation |
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| *(Citation will be updated with full details upon publication.)* |
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| ## License |
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| CFC26-mini is released under the Creative Commons Attribution 4.0 International [CC BY 4.0 License](https://creativecommons.org/licenses/by/4.0/deed.en). |
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