9_5.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import cv2
import numpy as np
from matplotlib import pyplot as plt
BLUE = [255, 0, 0]
img1 = cv2.imread(
    "F:/GitHub/children-python/Python_Books/OpenCV-Python-Tutoria/opencv01.jpg")
replicate = cv2.copyMakeBorder(img1, 10, 10, 10, 10, cv2.BORDER_REPLICATE)
reflect = cv2.copyMakeBorder(img1, 10, 10, 10, 10, cv2.BORDER_REFLECT)
reflect101 = cv2.copyMakeBorder(img1, 10, 10, 10, 10, cv2.BORDER_REFLECT_101)
wrap = cv2.copyMakeBorder(img1, 10, 10, 10, 10, cv2.BORDER_WRAP)
constant = cv2.copyMakeBorder(
    img1, 10, 10, 10, 10, cv2.BORDER_CONSTANT, value=BLUE)
plt.subplot(231), plt.imshow(img1, 'gray'), plt.title('ORIGINAL')
plt.subplot(232), plt.imshow(replicate, 'gray'), plt.title('REPLICATE')
plt.subplot(233), plt.imshow(reflect, 'gray'), plt.title('REFLECT')
plt.subplot(234), plt.imshow(reflect101, 'gray'), plt.title('REFLECT_101')
plt.subplot(235), plt.imshow(wrap, 'gray'), plt.title('WRAP')
plt.subplot(236), plt.imshow(constant, 'gray'), plt.title('CONSTANT')
plt.show()

# 图像扩边（填充）