README.md

---
license: cc-by-4.0
size_categories:
- n<1K
task_categories:
- object-detection
- image-segmentation
language:
- en
pretty_name: COCO Detection
---

# Dataset Card for "COCO Detection"

## Quick Start
### Usage
```python
>>> from datasets.load import load_dataset

>>> dataset = load_dataset('whyen-wang/coco_detection')
>>> example = dataset['train'][500]
>>> print(example)
{'image': <PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=640x426>,
 'bboxes': [
  [192.4199981689453, 220.17999267578125,
   129.22999572753906, 148.3800048828125],
  [76.94000244140625, 146.6300048828125,
   104.55000305175781, 109.33000183105469],
  [302.8800048828125, 115.2699966430664,
   99.11000061035156, 119.2699966430664],
  [0.0, 0.800000011920929,
   592.5700073242188, 420.25]],
 'categories': [46, 46, 46, 55],
 'inst.rles': {
  'size': [[426, 640], [426, 640], [426, 640], [426, 640]],
  'counts': [
   'gU`2b0d;...', 'RXP16m<=...', ']Xn34S=4...', 'n:U2o8W2...'
  ]}}
```

### Visualization
```python
>>> import cv2
>>> import numpy as np
>>> from PIL import Image

>>> def transforms(examples):
        inst_rles = examples.pop('inst.rles')
        annotation = []
        for i in inst_rles:
            inst_rles = [
                {'size': size, 'counts': counts}
                for size, counts in zip(i['size'], i['counts'])
            ]
            annotation.append(maskUtils.decode(inst_rles))
        examples['annotation'] = annotation
        return examples

>>> def visualize(example, names, colors):
        image = np.array(example['image'])
        bboxes = np.array(example['bboxes']).round().astype(int)
        bboxes[:, 2:] += bboxes[:, :2]
        categories = example['categories']
        masks = example['annotation']
        n = len(bboxes)
        for i in range(n):
            c = categories[i]
            color, name = colors[c], names[c]
            cv2.rectangle(image, bboxes[i, :2], bboxes[i, 2:], color.tolist(), 2)
            cv2.putText(
                image, name, bboxes[i, :2], cv2.FONT_HERSHEY_SIMPLEX,
                1, color.tolist(), 2, cv2.LINE_AA, False
            )
            image[masks[..., i] == 1] = image[masks[..., i] == 1] // 2 + color // 2
        return image

>>> dataset.set_transform(transforms)

>>> names = dataset['train'].features['categories'].feature.names

>>> colors = np.ones((80, 3), np.uint8) * 255
>>> colors[:, 0] = np.linspace(0, 255, 80)
>>> colors = cv2.cvtColor(colors[None], cv2.COLOR_HSV2RGB)[0]

>>> example = dataset['train'][500]
>>> Image.fromarray(visualize(example, names, colors))
```

## Table of Contents
- [Table of Contents](#table-of-contents)
- [Dataset Description](#dataset-description)
  - [Dataset Summary](#dataset-summary)
  - [Supported Tasks and Leaderboards](#supported-tasks-and-leaderboards)
  - [Languages](#languages)
- [Dataset Structure](#dataset-structure)
  - [Data Instances](#data-instances)
  - [Data Fields](#data-fields)
  - [Data Splits](#data-splits)
- [Dataset Creation](#dataset-creation)
  - [Curation Rationale](#curation-rationale)
  - [Source Data](#source-data)
  - [Annotations](#annotations)
  - [Personal and Sensitive Information](#personal-and-sensitive-information)
- [Considerations for Using the Data](#considerations-for-using-the-data)
  - [Social Impact of Dataset](#social-impact-of-dataset)
  - [Discussion of Biases](#discussion-of-biases)
  - [Other Known Limitations](#other-known-limitations)
- [Additional Information](#additional-information)
  - [Dataset Curators](#dataset-curators)
  - [Licensing Information](#licensing-information)
  - [Citation Information](#citation-information)
  - [Contributions](#contributions)

## Dataset Description

- **Homepage:** https://cocodataset.org/
- **Repository:** None
- **Paper:** [Microsoft COCO: Common Objects in Context](https://arxiv.org/abs/1405.0312)
- **Leaderboard:** [Papers with Code](https://paperswithcode.com/dataset/coco)
- **Point of Contact:** None

### Dataset Summary

COCO is a large-scale object detection, segmentation, and captioning dataset.

### Supported Tasks and Leaderboards

[Object Detection](https://huggingface.co/tasks/object-detection)
[Image Segmentation](https://huggingface.co/tasks/image-segmentation)

### Languages

en

## Dataset Structure

### Data Instances

An example looks as follows.

```
{
    "image": PIL.Image(mode="RGB"),
    "bboxes": [
        [192.4199981689453, 220.17999267578125,
        129.22999572753906, 148.3800048828125],
        [76.94000244140625, 146.6300048828125,
        104.55000305175781, 109.33000183105469],
        [302.8800048828125, 115.2699966430664,
        99.11000061035156, 119.2699966430664],
        [0.0, 0.800000011920929,
        592.5700073242188, 420.25]],
    "categories": [46, 46, 46, 55],
    "inst.rles": {
        "size": [[426, 640], [426, 640], [426, 640], [426, 640]],
        "counts": ["gU`2b0d;...", "RXP16m<=...", "]Xn34S=4...", "n:U2o8W2..."]
    }
}
```

### Data Fields

[More Information Needed]

### Data Splits

|    name |   train | validation |
| ------- | ------: | ---------: |
| default | 118,287 |      5,000 |

## Dataset Creation

### Curation Rationale

[More Information Needed]

### Source Data

#### Initial Data Collection and Normalization

[More Information Needed]

#### Who are the source language producers?

[More Information Needed]

### Annotations

#### Annotation process

[More Information Needed]

#### Who are the annotators?

[More Information Needed]

### Personal and Sensitive Information

[More Information Needed]

## Considerations for Using the Data

### Social Impact of Dataset

[More Information Needed]

### Discussion of Biases

[More Information Needed]

### Other Known Limitations

[More Information Needed]

## Additional Information

### Dataset Curators

[More Information Needed]

### Licensing Information

Creative Commons Attribution 4.0 License

### Citation Information

```
@article{cocodataset,
  author    = {Tsung{-}Yi Lin and Michael Maire and Serge J. Belongie and Lubomir D. Bourdev and Ross B. Girshick and James Hays and Pietro Perona and Deva Ramanan and Piotr Doll{'{a} }r and C. Lawrence Zitnick},
  title     = {Microsoft {COCO:} Common Objects in Context},
  journal   = {CoRR},
  volume    = {abs/1405.0312},
  year      = {2014},
  url       = {http://arxiv.org/abs/1405.0312},
  archivePrefix = {arXiv},
  eprint    = {1405.0312},
  timestamp = {Mon, 13 Aug 2018 16:48:13 +0200},
  biburl    = {https://dblp.org/rec/bib/journals/corr/LinMBHPRDZ14},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}
```

### Contributions

Thanks to [@github-whyen-wang](https://github.com/whyen-wang) for adding this dataset.