图片处理
import cv2
#=============================
#截取图像某一部分ROI(region of interest)
mini=cv2.imread('C:/Users/59925/Desktop/pytest/pics/minions-s.jpg')
print(mini.shape)
cut_mini=mini[0:150,0:150]
cv2.imshow('img',cut_mini)
#============================
#颜色通道提取
b,g,r=cv2.split(mini)
cv2.imshow('b',b)
print(b.shape)
recover_mini=cv2.merge((b,g,r))
cv2.imshow('recover_mini',recover_mini)
print(recover_mini.shape)
#只保留一个通道b,其他通道（r,g)设为0
mini[:,:,0]=0
mini[:,:,2]=0
cv2.imshow('b',mini)