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import cv2
import numpy as np
import matplotlib . pyplot as plt
img = cv2 . imread ( ' second.png ' )
mask = np . zeros ( ( img . shape [ : 2 ] ) , np . uint8 )
bgdModel = np . zeros ( ( 1 , 65 ) , np . float64 )
fgdModel = np . zeros ( ( 1 , 65 ) , np . float64 )
rect = ( 81 , 189 , 587 , 1041 )
#这里计算了5次
cv2 . grabCut ( img , mask , rect , bgdModel , fgdModel , 5 , cv2 . GC_INIT_WITH_RECT )
#关于where函数第一个参数是条件， ，
mask2 = np . where ( ( mask == 2 ) | ( mask == 0 ) , 0 , 1 ) . astype ( ' uint8 ' )
#mask2就是这样固定的
plt . subplot ( 1 , 2 , 1 )
plt . imshow ( img )
plt . title ( ' original image ' )
plt . xticks ( [ ] )
plt . yticks ( [ ] )
plt . subplot ( 1 , 2 , 2 )
#这里的img也是固定的。
img = img * mask2 [ : , : , np . newaxis ]
plt . imshow ( img )
plt . title ( ' target image ' )
plt . xticks ( [ ] )
plt . yticks ( [ ] )
plt . show ( )
