AttributeError: module 'cv2.optflow' has no attribute 'writeOpticalFlow'

[lulu1315]

System Information

OpenCV python version: 4.9.0.80 Operating System / Platform: Ubuntu 20.04 Python version: 3.8.5

Detailed description

trying to write .flow files. i have opencv-contrib-python installed (pip3 install opencv-contrib-python) but it gives me this message (see title)

Steps to reproduce

using this code . flow is calculated with

deepF = cv2.optflow.createOptFlow_DeepFlow() flowDeep = deepF.calc(grayA, grayB, None) # cv2.optflow.writeOpticalFlow(flow_name,flowDeep)

Issue submission checklist

• [X] I report the issue, it's not a question
• [X] I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• [ ] I updated to the latest OpenCV version and the issue is still there
• [ ] There is reproducer code and related data files (videos, images, onnx, etc)

[LaurentBerger]

cv2.optflow.writeOpticalFlow(flow_name,flowDeep)

May be you should read doc carefully

cv.writeOpticalFlow("toto",flowDeep) MRE :

import numpy as np
import cv2 as cv

imgA = np.zeros((480,640))
imgB = np.zeros((480,640))

deepF = cv.optflow.createOptFlow_DeepFlow()
flowDeep = deepF.calc(imgA, imgB, None)

cv.writeOpticalFlow("toto",flowDeep)

[lulu1315]

ooops. ok it works. sorry for the noise