如何使用Python在OpenCV中读取图像（代码实现） _Python

先决条件：OpenCV基础
在本文中, 我们将尝试使用OpenCV(开放源计算机视觉)打开图像。一些外部库(例如numpy和matplotlib)也将用于完成我们的任务。
为此, 需要安装一些外部库：

pip install opencv-python pip install numpy pip install matplotlib

输入图片：

文章图片
Example＃1(使用Numpy)：

# Python code to reading an image using OpenCV import numpy as np import cv2# You can give path to the # image as first argument img = cv2.imread( 'cc.jpg' , 0 )# will show the image in a window cv2.imshow( 'image' , img) k = cv2.waitKey( 0 ) & 0xFF# wait for ESC key to exit if k = = 27 : cv2.destroyAllWindows()# wait for 's' key to save and exit elif k = = ord ( 's' ): cv2.imwrite( 'messigray.png' , img) cv2.destroyAllWindows()

Example＃2(使用Matplotlib)：

# Python code to reading an image using OpenCV import cv2 import numpy as np import matplotlib.pyplot as pltimg = cv2.imread( 'photo.jpg' , cv2.IMREAD_GRAYSCALE)cv2.imshow( 'image' , img) cv2.waitKey( 0 ) cv2.destoryAllWindows()

【如何使用Python在OpenCV中读取图像（代码实现）】输出：