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OpenCV Add Border to Image in Python

How to add border to image in python?

To create a frame around the image, the function cv2.copyMakeBorder () is used. This function takes the following arguments:

src - login image

top, bottom, left, right - edge width in number of pixels in corresponding directions

borderType - defines what type of border to add. There may be the following types

  • cv2.BORDER_CONSTANT 
  • cv2.BORDER_REFLECT -
  • cv2.BORDER_REFLECT_101
  • cv2.BORDER_REPLICATE
  • cv2.BORDER_WRAP 

value - Color of border if border type is cv2.BORDER_CONSTANT

import cv2
import numpy as np
from matplotlib import pyplot as plt
BLUE = [255,0,0]
img1 = cv2.imread('flower.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()

Result













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