光流提取中AttributeError: module ‘cv2.cv2‘ has no attribute ‘DualTVL1OpticalFlow_create‘

1.问题描述

最近在用opencv提取光流特征时候，参考别人的代码，使用cv2.DualTVL1OpticalFlow_create()时，发现e 'cv2.cv2' has no attribute 'DualTVL1OpticalFlow_create'这样的错误如下图所示

Python 3.6.9 |Anaconda, Inc.| (default, Jul 30 2019, 19:07:31) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.DualTVL1OpticalFlow_create()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'cv2.cv2' has no attribute 'DualTVL1OpticalFlow_create'
>>> cv2.__version__
'4.1.2'
>>>

2.解决办法

最后发现：这是因为opencv版本不一致的原因，需要用新的api接口"cv2.optflow.DualTVL1OpticalFlow_create()"进行调用如下图所示：

Python 3.6.9 |Anaconda, Inc.| (default, Jul 30 2019, 19:07:31) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.DualTVL1OpticalFlow_create()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'cv2.cv2' has no attribute 'DualTVL1OpticalFlow_create'
>>> cv2.__version__
'4.1.2'
>>> 
KeyboardInterrupt
>>> cv2.optflow.DualTVL1OpticalFlow_create()
<optflow_DualTVL1OpticalFlow 0x7f5490dab7b0>

3.注意事项

在python中使用opencv进行光流特征提取时，发现opencv4.0以下版本API接口“cv2.DualTVL1OpticalFlow_create()”，opencv4.0以上版本API接口使用“cv2.optflow.DualTVL1OpticalFlow_create()”；安装opencv时候，不仅要安装opencv-python版本，还需要安装pencv-contrib-python，并且两者安装版本最好一致，命令如下：

pip install opencv-python==4.1.2.30

pip install opencv-contrib-python==4.1.2.30

参考网址：