Python OpenCV cv2.copyMakeBorder()用法及代碼示例

OpenCV-Python是旨在解決計算機視覺問題的Python綁定庫。cv2.copyMakeBorder()方法用於在像相框一樣的圖像周圍創建邊框。

用法： cv2.copyMakeBorder(src, top, bottom, left, right, borderType, value)

參數：
src:它是源圖像。
top:它是頂部方向上的像素數的邊框寬度。
bottom:它是底部方向上的像素數的邊框寬度。
left:它是左側像素的邊界寬度。
right:它是沿正確方向的像素數的邊框寬度。
borderType:它描述了要添加哪種邊框。它由cv2.BORDER_CONSTANT，cv2.BORDER_REFLECT等標誌定義
value:這是一個可選參數，如果border type為，則描述邊框的顏色cv2.BORDER_CONSTANT。

返回值：它返回一個圖像。

borderType標誌如下所述：

cv2.BORDER_CONSTANT: It adds a constant colored border. The value should be given as next argument.
cv2.BORDER_REFLECT: The border will be mirror reflection of the border elements. Suppose, if image contains letters “abcdefg” then output will be “gfedcba|abcdefg|gfedcba“.
cv2.BORDER_REFLECT_101 or cv2.BORDER_DEFAULT: It does the same works as cv2.BORDER_REFLECT but with slight change. Suppose, if image contains letters “abcdefgh” then output will be “gfedcb|abcdefgh|gfedcba“.
cv2.BORDER_REPLICATE: It replicates the last element. Suppose, if image contains letters “abcdefgh” then output will be “aaaaa|abcdefgh|hhhhh“.

用於以下所有示例的圖像：

示例1:

# Python program to explain cv2.copyMakeBorder() method  
   
# importing cv2  
import cv2  
   
# path  
path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png'
   
# Reading an image in default mode 
image = cv2.imread(path) 
   
# Window name in which image is displayed 
window_name = 'Image'
  
# Using cv2.copyMakeBorder() method 
image = cv2.copyMakeBorder(image, 10, 10, 10, 10, cv2.BORDER_CONSTANT) 
  
# Displaying the image  
cv2.imshow(window_name, image)

輸出：

示例2:

# Python program to explain cv2.copyMakeBorder() method  
   
# importing cv2  
import cv2  
   
# path  
path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png'
   
# Reading an image in default mode 
image = cv2.imread(path) 
   
# Window name in which image is displayed 
window_name = 'Image'
  
# Using cv2.copyMakeBorder() method 
image = cv2.copyMakeBorder(image, 100, 100, 50, 50, cv2.BORDER_REFLECT) 
  
# Displaying the image  
cv2.imshow(window_name, image)

輸出：

相關用法

注：本文由純淨天空篩選整理自Rajnis09大神的英文原創作品 Python OpenCV | cv2.copyMakeBorder() method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。