code: def __init__(self, zone_path="datasets/zone"):
      # 0: b 1: g 3: r 123:w
      # w r not high speed
      # b g high speed
      assert zone_path != "", "Error: zone_path is not empty!"
      zones = {}
      for img_name in os.listdir(zone_path):
          camnum = int(img_name.split(".")[0][-3:])
          zone_img = cv2.imread(os.path.join(zone_path, img_name))
          zones[camnum] = zone_img
      self.zones = zones
      self.current_cam = 0
  
file_path: PaddleDetection/deploy/pptracking/python/mot/mtmct/zone.py
imports: import os
  import cv2
  import numpy
label_desc: Use image node_id 1 to create a new Zone object from inherited base classes: object with example: obj = Zone(zone_path)