超详细注释之OpenCV操作图像平移转换

# 对图像进行平移
# USAGE
# python opencv_translate.py

import argparse

import cv2
import imutils
# 导入必要的包
import numpy as np

# 构建命令行参数及解析
# --image 输入图像路径
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", type=str, default="ml.jpg",
                help="path to the input image")
args = vars(ap.parse_args())

# 从磁盘加载图像并显示
image = cv2.imread(args["image"])
image = imutils.resize(image, width=300)
cv2.imshow("Original", image)

# 将图像向右移动25像素,像下移动50像素
M = np.float32([[1, 0, 25], [0, 1, 50]])
shifted = cv2.warpAffine(image, M, (image.shape[1], image.shape[0]))
cv2.imshow("Shifted Down and Right", shifted)

# 修改图像向左移动50像素，向上移动90像素
M = np.float32([[1, 0, -50], [0, 1, -90]])
shifted = cv2.warpAffine(image, M, (image.shape[1], image.shape[0]))
cv2.imshow("Shifted Up and Left", shifted)

# 用一行代码实现平移——imutils.translate
shifted = imutils.translate(image, 0, 100)
cv2.imshow("Shifted Down", shifted)
cv2.waitKey(0)

cv2.destroyAllWindows()