Mahotas – 给定图像的质心
在本文中,我们将了解如何在 mahotas 中获得图像的质心。质心”(对于二进制图像)是一种有点复杂的说法,即“每个维度的平均值”。换句话说——取所有的 x 坐标并对它们进行平均——你得到了你的“质心”的 x 坐标,对于 y 也是一样的。
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.center_of_mass method
Syntax : mahotas.center_of_mass(img)
Argument : It takes image object as argument
Return : It returns center of mass co-ordinates
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
# importing required libraries
import mahotas
import mahotas.demos
from pylab import gray, imshow, show
import numpy as np
# loading image
img = mahotas.demos.load('lena')
# grey image
g = img[:, :, 1]
# multiplying grey image values
g = g * 100
# filtering image
img = img.max(2)
# showing image
imshow(img)
show()
# getting center of mass
center = mahotas.center_of_mass(img)
# printing center of mass co-ordinate
print("Center of Mass : " + str(center))
Python3
# importing required libraries
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
# loading image
img = mahotas.imread('dog_image.png')
# filtering image
img = img[:, :, 0]
# showing image
imshow(img)
show()
# getting center of mass
center = mahotas.center_of_mass(img)
# printing center of mass co-ordinate
print("Center of Mass : " + str(center))
输出 :
Center of Mass : [246.64854256 259.45157125]
另一个例子
Python3
# importing required libraries
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
# loading image
img = mahotas.imread('dog_image.png')
# filtering image
img = img[:, :, 0]
# showing image
imshow(img)
show()
# getting center of mass
center = mahotas.center_of_mass(img)
# printing center of mass co-ordinate
print("Center of Mass : " + str(center))
输出 :
Center of Mass : [265.35619268 482.66701402]