1. cv2 (Unofficial pre-built OpenCV packages for Python.)
pip install opencv-python
pip install opencv-contrib-python
import cv2
2. numpy (NumPy is the fundamental package for array computing with Python.)
pip install numpy
import numpy as np
hist, bin_edges = np.histogram(ndarray, bins) # 频数,分箱的边界(默认)
n, bins, patches = plt.hist(hist.flatten(), bins=bin_edges, density=1, edgecolor='None', facecolor='r', alpha=0.7, histtype='bar') ## flatten():将二维数组转化为一维数组
plt.show() # display histogram
3. Pillow (python2.x中为PIL, Python Imaging Library (Fork))
pip install Pillow
from PIL import Image
from PIL.Image import core as _imaging
4. matplotlib (Python plotting package)
pip install matplotlib
Successfully installed cycler-0.10.0 kiwisolver-1.1.0 matplotlib-3.0.3 pyparsing-2.4.0 python-dateutil-2.8.0 six-1.12.0
5.scikit-image
pip install scipy
pip install scikit-image
import skimage