python基于opencv批量生成验证码的示例

import cv2
import numpy as np
line_num = 10
pic_num = 1000
path = "./imgs/"
def randcolor():        
    return (np.random.randint(0,255),np.random.randint(0,255),np.random.randint(0,255))
    
def randchar():
    return chr(np.random.randint(65,90))
    
def randpos(x_start,x_end,y_start,y_end):
    return (np.random.randint(x_start,x_end),
            np.random.randint(y_start,y_end))
    
    
img_heigth = 60
img_width = 240
for i in range(pic_num):
    img_name = ""
    #生成一个随机矩阵，randint(low[, high, size, dtype])
    img = np.random.randint(100,200,(img_heigth,img_width, 3), np.uint8)
    #显示图像
    #cv2.imshow("ranImg",img)
    
    x_pos = 0
    y_pos = 25
    for i in range(4):
        char = randchar()
        img_name += char
        cv2.putText(img,char,
                    (np.random.randint(x_pos,x_pos + 50),np.random.randint(y_pos,y_pos + 35)), 
                    cv2.FONT_HERSHEY_SIMPLEX,
                    1.5,
                    randcolor(),
                    2,
                    cv2.LINE_AA)
        x_pos += 45
    
    #cv2.imshow("res",img)
    
    #添加线段
    for i in range(line_num):
        img = cv2.line(img,
                       randpos(0,img_width,0,img_heigth),
                       randpos(0,img_width,0,img_heigth),
                        randcolor(),
                        np.random.randint(1,2))
        
    #cv2.imshow("line",img)
    cv2.imwrite(path + img_name + ".jpg",img)
    #cv2.waitKey(0)                  
    #cv2.destroyAllWindows()