OpenCV追踪器算法使用报错求助：已安装opencv-contrib-python

问题原因 #

你的报错是因为OpenCV 4.5及以上版本将旧版追踪器（BOOSTING、MIL、KCF、TLD、MEDIANFLOW）迁移到了cv2.legacy子模块中，直接通过cv2.TrackerXXX_create()调用会触发属性不存在的错误。

修复方案 #

修改代码，从cv2.legacy模块调用追踪器创建方法，同时优化条件判断逻辑并增加无效输入处理：

import cv2

def ask_for_tracker():
    print("Welcome! What Tracker API would you like to use?")
    print("Enter 0 for BOOSTING: ")
    print("Enter 1 for MIL: ")
    print("Enter 2 for KCF: ")
    print("Enter 3 for TLD: ")
    print("Enter 4 for MEDIANFLOW: ")
    choice = input("Please select your tracker: ")

    if choice == '0':
        tracker = cv2.legacy.TrackerBoosting_create()
    elif choice == '1':
        tracker = cv2.legacy.TrackerMIL_create()
    elif choice == '2':
        tracker = cv2.legacy.TrackerKCF_create()
    elif choice == '3':
        tracker = cv2.legacy.TrackerTLD_create()
    elif choice == '4':
        tracker = cv2.legacy.TrackerMedianFlow_create()
    else:
        print("Invalid choice, defaulting to MIL tracker")
        tracker = cv2.legacy.TrackerMIL_create()

    return tracker

tracker = ask_for_tracker()

额外验证步骤 #

1. 先确认你的OpenCV版本：

   import cv2
   print(cv2.__version__)
   

2. 若版本低于4.5但仍报错，重新安装匹配版本的opencv-contrib-python：

   pip uninstall opencv-python opencv-contrib-python
   pip install opencv-python==4.4.0.46 opencv-contrib-python==4.4.0.46
   

内容的提问来源于stack exchange，提问作者Oğuz Berk Akdeniz