如何使用ImageDraw模糊椭圆

Question

我实现了一种检测面部的算法，我想模​​糊面部。我正在使用PIL来模糊它。

image = Image.open(path_img)
draw = ImageDraw.Draw(image)
draw.ellipse((top, left, bottom, right), fill = 'white', outline ='white')

我用我的代码得到了这个

Face to blur

我想用：

blurred_image = cropped_image.filter(ImageFilter.GaussianBlur(radius=10 ))

但我无法使用它，因为我使用的是ImageDraw，它只适用于Image类。如何用脸上的椭圆（圆形）模糊？

谢谢

Answer 1

模糊椭圆是最好的方法

使用Pillow，最好的方法是使用模糊的椭圆作为composite的混合蒙版。

from PIL import Image, ImageDraw, ImageFilter


def make_ellipse_mask(size, x0, y0, x1, y1, blur_radius):
    img = Image.new("L", size, color=0)
    draw = ImageDraw.Draw(img)
    draw.ellipse((x0, y0, x1, y1), fill=255)
    return img.filter(ImageFilter.GaussianBlur(radius=blur_radius))


kitten_image = Image.open("kitten.jpg")
overlay_image = Image.new("RGB", kitten_image.size, color="orange")  # This could be a bitmap fill too, but let's just make it orange
mask_image = make_ellipse_mask(kitten_image.size, 150, 70, 350, 250, 5)
masked_image = Image.composite(overlay_image, kitten_image, mask_image)
masked_image.show()

给定this adorable kitten作为输入，输出为

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编辑：灵感来自Mark Setchell的答案，只需将overlay_image线更改为

overlay_image = kitten_image.filter(ImageFilter.GaussianBlur(radius=15))

给我们这个模糊变体（模糊的边缘光滑:)）

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Answer 2

不确定是否要在图像上合成某些内容以隐藏内容或模糊内容。这更模糊:-)

从帕丁顿开始：

您可以像这样进入“Stealth Mode”：

#!/usr/bin/env python3

from PIL import Image, ImageDraw, ImageFilter
import numpy as np

# Open image
im = Image.open('paddington.png')

# Make a mask the same size as the image filled with black
mask = Image.new('RGB',im.size)

# Draw a filled white circle onto the black mask
draw = ImageDraw.Draw(mask)
draw.ellipse([90,40,300,250],fill=(255,255,255))

# Blur the entire image
blurred = im.filter(ImageFilter.GaussianBlur(radius=15))

# Select either the original or the blurred image at each pixel, depending on the mask
res = np.where(np.array(mask)>0,np.array(blurred),np.array(im)) 

# Convert back to PIL Image and save
Image.fromarray(res).save('result.png')

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或者，正如@AKX所建议的那样，您可以删除Numpy依赖项并使代码更小但仍然得到相同的结果：

#!/usr/bin/env python3

from PIL import Image, ImageDraw, ImageFilter
import numpy as np

# Open image
im = Image.open('paddington.png')

# Make a mask the same size as the image filled with black
mask = Image.new('L',im.size)

# Draw a filled white circle onto the black mask
draw = ImageDraw.Draw(mask)
draw.ellipse([90,40,300,250],fill=255)

# Blur the entire image
blurred = im.filter(ImageFilter.GaussianBlur(radius=15))

# Composite blurred image over sharp one within mask
res = Image.composite(blurred, im, mask)

# Save
res.save('result.png')