Simple Black/White picture analysis

import cv2
import numpy as np
img = cv2.imread("9.jpg")

lc = 0          # Line counter

for line in img:
    last = (sum(line[0]) > 382)        # Get colour of first pixel on the line (Black or White)
    lc += 1
    ctr = 0
    pos = 0
    print("Line:", lc, end=": ")
    for y in line:
        v = (sum(y) > 382)          # Black = 0, White = 1
        if v == last:               # Same colour as last pixel?
            ctr += 1
        else:
            print(last, ctr, end="  ")
            if last:
                print("mid:", pos + ctr // 2, end="  ")
            pos += ctr
            ctr = 1
            last = v

    print(last, ctr)
    # print("Line", lc, "White width", ctr)

#show image
cv2.imshow("img", img)
cv2.waitKey(0)