根据点坐标画框

应用场景：
文件夹img，txt，
img存放的是原图，txt存放的是img中图片名字一样的.txt。
其中一个txt样例如下：

514,6,531,6,548,6,565,6,582,6,599,6,615,6,628,74,611,74,594,74,577,74,560,74,543,74,526,74
881,106,913,110,944,113,975,116,1007,119,1038,123,1070,126,1058,327,1029,324,1000,320,971,317,942,314,913,311,884,307
400,239,446,239,492,239,538,239,584,239,630,239,676,239,681,317,635,317,589,317,543,317,497,317,451,317,405,317
396,359,509,359,623,359,736,359,850,359,963,359,1077,359,1082,440,968,440,855,440,741,440,628,440,514,440,400,440
777,469,828,469,879,469,929,469,980,469,1031,469,1082,469,1079,554,1029,554,978,554,927,554,876,554,826,554,775,554
396,482,442,482,487,482,533,482,579,482,625,482,671,482,678,560,632,560,586,560,541,560,495,560,449,560,403,560

一个框一行

import cv2
import numpy as np
import os

dir_img = "/img/"
dir_txt = "/txt/"

save_dir = os.path.dirname(os.path.dirname(dir_img)) + '/show_pt/'
if not os.path.exists(save_dir):
    os.makedirs(save_dir)

def deal_txt_pt(path_txt):
    lll_pt = []
    with open(path_txt, 'r') as fr:
        for line in fr.readlines():
            ll_pt = []
            line = line.strip()
            list_num = line.split(',')
            l_pt = []
            for cnt, num in enumerate(list_num):
                num = float(num)
                l_pt.append(num)
                if 2 == len(l_pt):
                    ll_pt.append(l_pt)
                    l_pt = []
            lll_pt.append(ll_pt)
    return lll_pt



list_img = os.listdir(dir_img)
for cnt,img_name in enumerate(list_img):
    print("cnt=%d,img_name=%s"%(cnt,img_name))
    txt_name = img_name.replace('.jpg','.txt')
    path_img = dir_img + img_name
    path_txt = dir_txt + txt_name
    save_path = save_dir + img_name
    img = cv2.imread(path_img)
    lll_pt = deal_txt_pt(path_txt)
    for ll_pt in lll_pt:
        pts = np.array(ll_pt,np.int32)
        pts = pts.reshape((-1, 1, 2))
        cv2.polylines(img, [pts], 1, (0, 255, 255),2)

    cv2.imwrite(save_path,img)