Update tools.md

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Lin Manhui 2 years ago committed by GitHub
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      docs/data/tools.md

@ -146,4 +146,4 @@ python extract_ms_patches.py --image_paths {一个或多个输入影像路径} -
- `--nonzero_ratio`:指定一个阈值,对于任意一幅源影像,若影像块中非零像素占比小于此阈值,则该影像块将被舍弃。若为`None`,则表示不进行过滤。默认为`None`。
- `--visualize`:若指定此选项,则程序执行完毕后将生成图像`./vis_quadtree.png`,其中保存有四叉树中节点情况的可视化结果,一个例子如下图所示:
[vis_quadtree_example](https://user-images.githubusercontent.com/21275753/189264850-f94b3d7b-c631-47b1-9833-0800de2ccf54.png)
![vis_quadtree_example](https://user-images.githubusercontent.com/21275753/189264850-f94b3d7b-c631-47b1-9833-0800de2ccf54.png)

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