Mahotas – 调整图像大小
在本文中,我们将了解如何在 mahotas 中调整图像大小。当您将图像从一个像素网格调整到另一个像素网格或将其扭曲时,就会发生图像插值。当您需要增加或减少总像素数时,需要调整图像大小,而在校正镜头失真或旋转图像时可能会发生重新映射。
在本教程中,我们将使用“lena”图像,下面是加载它的命令。
mahotas.demos.load('lena')
下面是莉娜的图片
In order to do this we will use mahotas.imresize method
Syntax : mahotas.imresize(img, size)
Argument : It takes image object and new size as argument
Return : It returns image object
注意:输入图像应被过滤或应加载为灰色
为了过滤图像,我们将获取图像对象 numpy.ndarray 并在索引的帮助下对其进行过滤,下面是执行此操作的命令
image = image[:, :, 0]
下面是实现
Python3
# importing required libraries
import mahotas
import mahotas.demos
from pylab import gray, imshow, show
import numpy as np
import matplotlib.pyplot as plt
# loading image
img = mahotas.demos.load('lena')
# filtering image
img = img.max(2)
print("Image")
# showing image
imshow(img)
show()
# resizing image
new_img = mahotas.imresize(img, [200, 250])
# showing image
print("Resized Image")
imshow(new_img)
show()
Python3
# importing required libraries
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
import matplotlib.pyplot as plt
# loading image
img = mahotas.imread('dog_image.png')
# filtering image
img = img[:, :, 0]
print("Image")
# showing image
imshow(img)
show()
# resizing image
new_img = mahotas.imresize(img, [200, 200])
# showing image
print("Resized Image")
imshow(new_img)
show()
输出 :
Image
Resized Image
另一个例子
Python3
# importing required libraries
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
import matplotlib.pyplot as plt
# loading image
img = mahotas.imread('dog_image.png')
# filtering image
img = img[:, :, 0]
print("Image")
# showing image
imshow(img)
show()
# resizing image
new_img = mahotas.imresize(img, [200, 200])
# showing image
print("Resized Image")
imshow(new_img)
show()
输出 :
Image
Resized Image