# 比较与torchvision.transforms.RandomSolarize的功能差异

<a href="https://gitee.com/mindspore/docs/blob/r2.0.0-alpha/docs/mindspore/source_zh_cn/note/api_mapping/pytorch_diff/RandomSolarize.md" target="_blank"><img src="https://mindspore-website.obs.cn-north-4.myhuaweicloud.com/website-images/r2.0.0-alpha/resource/_static/logo_source.png"></a>

## torchvision.transforms.RandomSolarize

```python
class torchvision.transforms.RandomSolarize(
    threshold,
    p=0.5
    )
```

更多内容详见[torchvision.transforms.RandomSolarize](https://pytorch.org/vision/0.10/transforms.html#torchvision.transforms.RandomSolarize)。

## mindspore.dataset.vision.RandomSolarize

```python
class mindspore.dataset.vision.RandomSolarize(
    threshold=(0, 255)
    )
```

更多内容详见[mindspore.dataset.vision.RandomSolarize](https://mindspore.cn/docs/zh-CN/r2.0.0-alpha/api_python/dataset_vision/mindspore.dataset.vision.RandomSolarize.html#mindspore.dataset.vision.RandomSolarize)。

## 使用方式

PyTorch：通过反转高于阈值的所有像素值，以给定的概率随机对图像进行曝光操作。

MindSpore：从指定阈值范围内随机选择一个子范围，并将图像像素值调整在子范围内。

## 代码示例

```python
from PIL import Image
from pathlib import Path
import numpy as np
import matplotlib.pyplot as plt
import torchvision.transforms as T
import mindspore.dataset.vision as vision

orig_img = Image.open(Path('.') / 'test.jpg')

def show_diff_image(image_original, image_transformed):

    num = 2

    plt.subplot(1, num, 1)
    plt.imshow(image_original)
    plt.title("Original image")

    plt.subplot(1, num, 2)
    plt.imshow(image_transformed)
    plt.title("Random Solaried image")

    plt.show()


# In MindSpore, randomly selects a subrange within the specified threshold range and sets the pixel value within the subrange to (255 - pixel).

solarizer  = vision.RandomSolarize(threshold=(10,100))
rand_sola_img = solarizer(orig_img)
show_diff_image(orig_img, rand_sola_img)

# Out:
# Original image and Solarized image are showed with matplotlib tools


# In torch, the RandomSolarize transform randomly solarizes the image by inverting all pixel values above the threshold.

solarizer = T.RandomSolarize(threshold=192.0)
solarized_imgs = solarizer(orig_img)
show_diff_image(orig_img, solarized_imgs)

# Out:
# Original image and Solarized image are showed with matplotlib tools
```