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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:



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