WinPython and OpenCV

Question

I use WinPython to write my python programs. I need to solve the task of detecting faces in a video stream. I have installed opencv-python to WinPython using this command:

pip install opencv-python==3.4.0.12

When I run the following code, I get a False:

import numpy as np
import cv2
cap = cv2.VideoCapture(0)
ret, img = cap.read()
print(ret)

What I am doing wrong?

Alex Bodnya · Accepted Answer · 2018-02-12 15:20:00Z

3

Seems like legit function result. As you can see, from documentation VideoCapture::read function returns retval and image, in case there was image to return. Apparently, "False" value of the ret variable in your code means that there was no image.

Edit:

I looked up documentation and here's what i've found:

"If no frames has been grabbed (camera has been disconnected, or there are no more frames in video file), the methods return false and the functions return NULL pointer."

edited Feb 12, 2018 at 15:20

answered Feb 12, 2018 at 14:59

Alex Bodnya

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4 Comments

V. Gai Over a year ago

Hi! This code only should to capture image from camera and it shouldn't detecting faces

Alex Bodnya Over a year ago

Sorry, I've misread documentation. I've edited comment, so it will be more helpful.

Alex Bodnya Over a year ago

I suggest, you try to run your code not with the device, but with video file(.avi, for example), to make sure that the code is working properly.

V. Gai Over a year ago

Thank you! I can read .mp4 file. I think it's my web cam error!

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