Function Differences with torchvision.transforms.RandomSolarize

torchvision.transforms.RandomSolarize

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

For more information, see torchvision.transforms.RandomSolarize.

mindspore.dataset.vision.c_transforms.RandomSolarize

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

For more information, see mindspore.dataset.vision.c_transforms.RandomSolarize.

Differences

PyTorch：Solarize the image randomly with a given probability by inverting all pixel values above a threshold. If img is a Tensor, it is expected to be in […, 1 or 3, H, W] format, where … means it can have an arbitrary number of leading dimensions. If img is PIL Image, it is expected to be in mode “L” or “RGB”.

MindSpore：Randomly selects a subrange within the specified threshold range and sets the pixel value within the subrange to (255 - pixel).

Code Example

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.c_transforms as c_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  = c_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