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import cv2

img = cv2.imread("a28.png",cv2.IMREAD_COLOR)#cv2.IMREAD_GRAYSCALE读入灰图
img_gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(img_gray,200,255,cv2.THRESH_BINARY_INV)

cv2.imwrite("a28_gray.png",img_gray)
cv2.imwrite("a28_thresh.png",thresh)