> For the complete documentation index, see [llms.txt](https://docs.roboflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.roboflow.com/roboflow/roboflow-jp/datasets/dataset-versions/image-augmentation/augmentation-types/flip-augmentation.md).

# 反転拡張

画像を縦または横にランダムに反転（反射）して、モデルが被写体の向きに影響されにくくなるようにします。

* **横方向：** 画像の [NumPy 配列](https://numpy.org/) を左右方向に反転します。
* **縦方向：** 画像の [NumPy 配列](https://numpy.org/) を上下方向に反転します。

## 例

<figure><img src="/files/b28b4f64a40941f3068ccf4a605d2b34d56af56e" alt=""><figcaption><p>元の画像</p></figcaption></figure>

<figure><img src="/files/1126f0e16979a34565eea8ba1efdbbe4c79e60cf" alt=""><figcaption><p>Flip Augmentation Horizontal</p></figcaption></figure>

<figure><img src="/files/9eb495ca0e2c75e78a2e5765a1e47a4254a57d2d" alt=""><figcaption><p>Flip Augmentation Vertical</p></figcaption></figure>

## Learn More

* [Flip Augmentation がモデルのパフォーマンスをどのように向上させるかを見る](https://blog.roboflow.com/how-flip-augmentation-improves-model-performance/)


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