OpenCV图像处理---给图片添加边界

import cv2

img = cv2.imread('../2.jpg')
cv2.imshow('src', img)

'''
cv2.copyMakeBorder()
    参数：
        img:图像对象
        top,bottom,left,right: 上下左右边界宽度，单位为像素值
        borderType:
            cv2.BORDER_CONSTANT, 带颜色的边界，需要传入另外一个颜色值
            cv2.BORDER_REFLECT, 边缘元素的镜像反射做为边界
            cv2.BORDER_REFLECT_101/cv2.BORDER_DEFAULT
            cv2.BORDER_REPLICATE, 边缘元素的复制做为边界
            CV2.BORDER_WRAP
        value: borderType为cv2.BORDER_CONSTANT时，传入的边界颜色值，如[0,255,0]
'''

resultImg1 = cv2.copyMakeBorder(img, 5, 5, 5, 5, cv2.BORDER_CONSTANT, value=[0,255,0])
cv2.imshow('resultImg1', resultImg1)

resultImg2 = cv2.copyMakeBorder(img, 5, 5, 5, 5, cv2.BORDER_REFLECT)
cv2.imshow('resultImg2', resultImg2)

resultImg3 = cv2.copyMakeBorder(img, 5, 5, 5, 5, cv2.BORDER_REFLECT_101)
cv2.imshow('resultImg3', resultImg3)

resultImg4 = cv2.copyMakeBorder(img, 5, 5, 5, 5, cv2.BORDER_REPLICATE)
cv2.imshow('resultImg4', resultImg4)

resultImg5 = cv2.copyMakeBorder(img, 5, 5, 5, 5, cv2.BORDER_WRAP)
cv2.imshow('resultImg4', resultImg4)


cv2.waitKey(0)