Python OpenCV–cv2.rotate()方法
原文:https://www.geesforgeks.org/python-opencv-cv2-rotate-method/
OpenCV-Python 是一个 Python 绑定库，旨在解决计算机视觉问题。cv2.rotate()方法用于以 90 度的倍数旋转 2D 阵列。函数 cv::rotate 以三种不同的方式旋转数组。
语法: cv2.cv.rotate( src，rotateCode[，dst])
参数: src: 就是要改变颜色空间的图像。 旋转代码:是一个枚举，指定如何旋转数组。 dst: 是与 src 图像大小和深度相同的输出图像。这是一个可选参数。
返回值:返回图像。
图像用于以下所有示例:
示例#1: 顺时针旋转 90 度
# Python program to explain cv2.rotate() method
# importing cv2
import cv2
# path
path = r'C:\Users\user\Desktop\geeks14.png'
# Reading an image in default mode
src = cv2.imread(path)
# Window name in which image is displayed
window_name = 'Image'
# Using cv2.rotate() method
# Using cv2.ROTATE_90_CLOCKWISE rotate
# by 90 degrees clockwise
image = cv2.rotate(src, cv2.cv2.ROTATE_90_CLOCKWISE)
# Displaying the image
cv2.imshow(window_name, image)
cv2.waitKey(0)
输出:
例 2: 顺时针旋转 180 度
# Python program to explain cv2.rotate() method
# importing cv2
import cv2
# path
path = r'C:\Users\user\Desktop\geeks14.png'
# Reading an image in default mode
src = cv2.imread(path)
# Window name in which image is displayed
window_name = 'Image'
# Using cv2.rotate() method
# Using cv2.ROTATE_180 rotate by
# 180 degrees clockwise
image = cv2.rotate(src, cv2.ROTATE_180)
# Displaying the image
cv2.imshow(window_name, image)
cv2.waitKey(0)
输出:
例 3: 顺时针旋转 270 度
# Python program to explain cv2.rotate() method
# importing cv2
import cv2
# path
path = r'C:\Users\user\Desktop\geeks14.png'
# Reading an image in default mode
src = cv2.imread(path)
# Window name in which image is displayed
window_name = 'Image'
# Using cv2.rotate() method
# Using cv2.ROTATE_90_COUNTERCLOCKWISE
# rotate by 270 degrees clockwise
image = cv2.rotate(src, cv2.ROTATE_90_COUNTERCLOCKWISE)
# Displaying the image
cv2.imshow(window_name, image)
cv2.waitKey(0)
输出:
