python使用垂直投影法进行字符串分割

import cv2
import random
import string

# 1、读取图像，并把图像转换为灰度图像并显示
img = cv2.imread("D:\\picture\\test1\\rectify\\04875396.jpg")  # 读取图片
img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)  # 转换了灰度化
cv2.imshow('gray', img_gray)  # 显示图片
# 2、将灰度图像二值化，设定阈值是100
img_thre = img_gray
cv2.threshold(img_gray, 100, 255, cv2.THRESH_BINARY_INV, img_thre)
cv2.imshow('threshold', img_thre)
# 3、保存黑白图片
cv2.imwrite('thre_res.png', img_thre)
# 4、分割字符
white = []  # 记录每一列的白色像素总和
black = []  # ..........黑色.......
height = img_thre.shape[0]
width = img_thre.shape[1]
white_max = 0
black_max = 0
# 计算每一列的黑白色像素总和
for i in range(width):
    s = 0  # 这一列白色总数
    t = 0  # 这一列黑色总数
    for j in range(height):
        if img_thre[j][i] == 255:
            s += 1
        if img_thre[j][i] == 0:
            t += 1
    white_max = max(white_max, s)
    black_max = max(black_max, t)
    white.append(s)
    black.append(t)
    print(s)
    print(t)
arg = False  # False表示白底黑字；True表示黑底白字
if black_max > white_max:
    arg = True

# 分割图像
def find_end(start_):
    end_ = start_ + 1
    for m in range(start_ + 1, width - 1):
        if (black[m] if arg else white[m]) > (0.95 * black_max if arg else 0.95 * white_max):  # 0.95这个参数请多调整，对应下面的0.05
            end_ = m
            break
    return end_
n = 1
start = 1
end = 2
while n < width - 2:
    n += 1
    if (white[n] if arg else black[n]) > (0.05 * white_max if arg else 0.05 * black_max):
        # 上面这些判断用来辨别是白底黑字还是黑底白字
        # 0.05这个参数请多调整，对应上面的0.95
        start = n
        end = find_end(start)
        n = end
        if end - start > 5:
            cj = img_thre[1:height, start:end]
            cv2.imshow('caijian', cj)
            salt = ''.join(random.sample(string.digits, 8))  # 随机输出8位由数字组成的字符串
            cv2.imwrite(r"D:\\picture\\test1\\rectify\\" + salt + '.jpg', cj)  # 存储裁剪得到的图像
#cv2.waitKey(0)