# Semantic Segmentation Example

## Annotation

```bash
labelme data_annotated --labels labels.txt --validate-label exact --config '{shift_auto_shape_color: -2}'
```

![](.readme/annotation.jpg)

## Convert to VOC-format Dataset

```bash
# It generates:
#   - data_dataset_voc/JPEGImages
#   - data_dataset_voc/SegmentationClass
#   - data_dataset_voc/SegmentationClassNpy
#   - data_dataset_voc/SegmentationClassVisualization
./labelme2voc.py data_annotated data_dataset_voc --labels labels.txt --noobject
```

<img src="data_dataset_voc/JPEGImages/2011_000003.jpg" width="33%" /> <img src="data_dataset_voc/SegmentationClass/2011_000003.png" width="33%" /> <img src="data_dataset_voc/SegmentationClassVisualization/2011_000003.jpg" width="33%" />

Fig 1. JPEG image (left), PNG label (center), JPEG label visualization (right)

Note that the label file contains only very low label values (ex. `0, 4, 14`), and
`255` indicates the `__ignore__` label value (`-1` in the npy file).\
You can see the label PNG file by following.

```bash
../tutorial/draw_label_png.py data_dataset_voc/SegmentationClass/2011_000003.png
```

<img src=".readme/draw_label_png.jpg" width="33%" />
