import cv2
import numpy as np
# read image
img = cv2.imread('black_white.jpg')
hh, ww = img.shape[:2]
# convert to gray
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# threshold
thresh = cv2.threshold(gray, 128, 255, cv2.THRESH_BINARY)[1]
# count number of white pixels in columns as new array
count = np.count_nonzero(thresh, axis=0)
# get first and last x coordinate where black (count==0)
first_black = np.where(count==0)[0][0]
last_black = np.where(count==0)[0][-1]
# compute x center
black_center = (first_black + last_black) // 2
print(black_center)
# crop into two parts
left = img[0:hh, 0:black_center]
right = img[0:hh, black_center:ww]
# combine them horizontally after swapping
result = np.hstack([right, left])
# write result to disk
cv2.imwrite("black_white_rolled.jpg", result)
# display it
cv2.imshow("RESULT", result)
cv2.waitKey(0)
下面是我在评论中针对Python/OpenCV/Numpy所做的详细说明。这是你想要的吗
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