After cap.release() the only Frame is getting closed, webcam light is still ON.
import cv2
cap = cv2.VideoCapture(0)
#cap = cv2.VideoCapture(-1) if i give '-1' instead of '0' then light is getting OFF
#but camera is not working because i don't have second camera to laptop.
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# Display the resulting frame
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cap.isOpened() #returns False
cv2.destroyAllWindows()
By pressing 'q', the Frame is getting closed but webcam light is still ON.
How to OFF the webcam? (It is getting OFF after python shell is closed.)
If possible, tell me the path of cv2.VideoCapture() class source code.
Set OPENCV_VIDEOIO_PRIORITY_MSMF=0 in your environment variables. Seems like there is an instance leak in opencv library. If you're on windows maybe use setx in your cmd to set the value setx OPENCV_VIDEOIO_PRIORITY_MSMF 0.
Reference to the issue : here
And it looks like the issue has been fixed too. So try updating your opencv library or reinstalling altogether.
That should solve your problem.
Related
My problem is when I try to run this code on my Mac, the camera turns on the green light but it doesn't open at all. I have no idea why this is happing. I tried a lot of things but nothing worked for me, I am just thinking the new update from Apple messed up some stuff, because it used to work before.
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2BGRA)
# Display the resulting frame
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
In mac you have to use the Mac Terminal for the cv2 library since currently no other terminal to my knowledge asks for the camera permission.
I'm simply trying to read IP Camera live stream through OpenCV's simple code, i.e as follows:
import numpy as np
import cv2
src = 'rtsp://id:pass#xx.xx.xx.xx'
cap = cv2.VideoCapture(src)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# Display the resulting frame
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
The problem here is, sometime it works like a charm by showing the running live video, but sometime else it creates a lot of blank windows which keeps popping up until the job is killed. Like the below image:
Why does it happen, also how can we avoid it?
Maybe you should cover the case that the video capture fails to establish a healthy stream.
Note that it is possible to not to receive a frame in some cases even though video capture opens. This can happen due to various reasons such as congested network traffic, insufficient computational resources, power saving mode of some IP cameras.
Therefore, I would suggest you to check in the frame size and make sure that your VideoCapture object is receiving the frame at right shape. (You can debug and see the size of a visible frame to learn the expected resolution of the camera.)
A change in your loop like following might help
min_expected_frame_size = [some integer]
while(cap.isOpened()):
ret, frame = cap.read()
width = cap.get(cv2.CAP_PROP_FRAME_WIDTH)
height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
if ret==True and ((width*height) >= min_expected_frame_size):
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
I run this (first one) example that launches the webcam of my latop so that I can see myself on the screen.
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# Display the resulting frame
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
I installed OpenBr on Ubuntu 14.04 LTS and I run successfully this command on a picture of myself:
br - gui -algorithm ShowFaceDetection -enrollAll -enroll /home/nakkini/Desktop/myself.png
The above command I run on the Terminal displays my picture and draws a square around my face (face detection), it also highlights my eyes in green.
My Dream:
I wonder if there is a way to combine this command with the short program above so that when the webcam is launched I can see my face surrounded by the green rectangle ?
Why do I need this ?
I found similar programs in pure OpenCV/Python for this purpos. However, for later needs, I need more things than the simple face detection and I judge by myself that OpenBR will save me lot of headache. That is why I am looking for a way to run the command line somewhere inside the code above as a first but big step.
Hints:
The frame in the code corresponds to myself.png of the command line. The solution to be found will try to pass frame in the place of myself.png to the command line within the program itself.
Thank you very much in advance.
EDIT:
After correcting the typos of #Xavier's solution I have no errors. However the program does not run as I want it:
First, the camer is launched and I see myself but my face is not detected with a green rectangle. Secondly, I press any key to exit but the program does not exit: it shows me a picture of myself with my face detected. A last key press exists the program. My goal is to see my face detected during the camera functionment.
you do not need openbr for this at all.
just see opencv's python face-detect tutorial
something like this should work
import numpy as np
import cv2
import os
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# Display the resulting frame
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
cv2.imwrite( "/home/nakkini/Desktop/myself.png", gray );
os.system('br - gui -algorithm -ShowFaceDetection -enrollAll -enroll /home/nakkini/Desktop/myself.png')
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
I am using the code below, but I get a black image. Could you please help me rectify the error?
import cv2
import numpy as np
c = cv2.VideoCapture(0)
while(1):
_,f = c.read()
cv2.imshow('e2',f)
if cv2.waitKey(5)==27:
break
cv2.destroyAllWindows()
Update: See github.com/opencv/opencv/pull/11880 and linked conversations, only few backends support -1 as index.
Although this is an old post, this answer can help people who are still facing the same problem. If you have a single webcam but it renders all black, use cv2.VideoCapture(-1). This will get you the working camera.
Just change cv2.waitKey(0) to cv2.waitKey(30) and this issue will be resolved.
I've faced with same problem. Updating neither opencv nor webcam driver works. I am using kaspersky as antivirus. When I disable the kaspersky, then black output problem solved.
BTW, I can see the running .py file in kaspersky console > reports > host intrusion prevention. It reports application privilege control rule triggered - application: myfile.py, result: blocked: access to video capturing devices
Try this:
import cv2
import numpy as np
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
This worked for me:
I did a pip install imutils. Imutils is a library with series of convenience functions to make basic image processing functions such as translation, rotation, resizing, skeletonization, displaying Matplotlib images, sorting contours, detecting edges, and much more easier with OpenCV and both Python 2.7 and Python 3.
import cv2
import imutils
cap = cv2.VideoCapture(0) # video capture source camera (Here webcam of laptop)
ret, frame = cap.read() # return a single frame in variable `frame`
while (True):
# gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
(grabbed, frame) = cap.read()
frame = imutils.resize(frame, width=400)
cv2.imshow('img1', frame) # display the captured image
if cv2.waitKey(1) & 0xFF == ord('q'): # save on pressing 'y'
cv2.imwrite('capture.png', frame)
cv2.destroyAllWindows()
break
cap.release()
Try put -0 on the index and pause any antivirus running
import cv2
import numpy as np
cap = cv2.VideoCapture(-0)
cap.set(3,640)
cap.set(3,480)
while(True):
success, img = cap.read()
cv2.imshow('frame',img)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
I faced the same issue after many calls with:
cap = cv2.VideoCapture(0)
and it solved when I changed the index to 1 :
cap = cv2.VideoCapture(1)
In my case just disabling Kaspersy has solved the problem.
Well, it seems like my question had been asked many times before and unfortunately, no one replied. I hope someone will help.
I have an Easycap device that converts the analog images from my analog camera to digital signals through a USB port.
The device is identified to the system in the Device Manager under "Sound, Video and game controllers" category as "SMI Grabber Device".
I use a simple Python code to display the video from this device. I also have an embedded webcam in my laptop.
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Display the resulting frame
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
if cv2.waitKey(1) & 0xFF == ord('s'):
cv2.imwrite('screenshot.jpg',frame)
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
First, when I unplug the Easycap, CaptureVideo(0) returns the embedded webcam video stream. However, when I plug the Easycap, an error appears:
"Traceback (most recent call last):
File "C:\Users\DELL\Desktop\code\cam.py", line 10, in
cv2.imshow('frame',frame)
error: ......\src\opencv\modules\highgui\src\window.cpp:261: error: (-215) size.width>0 && size.height>0"
Notice that, any number except 0 makes the program display the webcam image. So if I tried cap = cv2.CaptureVideo(1), it will show the webcam, cap = cv2.CaptureVideo(20) is the same.
I also tried to enter "SMI Grabber Device" instead of 0 or 1 in the VideoCaptureconstructor function, but it didn't make any difference.
I'm using Windows 8, and I've installed the accompanying driver for Easycap. The software that comes with the driver (called ULead) works fine and display the CCTV camera video. I tried to display the images while I'm closing that program, and without, the result is the same.
I used before a C# program with Aforge library which had getCamList method or something which allowed me to choose the specific device I want to display from a comboBox. I can't find a similar function is opencv.
I'm using OpenCV 2.4.6. I didn't try the code on prior versions.
I really need to understand why this code doesn't work, knowing that I'm just a very beginner of opencv and image processing.
I hope someone can help.
I am using EasyCAP too.
You must check that ret is True.
I am use below code
while True:
ret, frame = vc.read()
if ret:
break
cv2.waitKey(10)
h, w = frame.shape[:2]
print h, w
while True:
ret, frame = vc.read()
if ret:
cv2.imshow(WID, frame)
if cv2.waitKey(1) == 27:
break
Let there be light!
On serious note, I struggled with the same problem and I hope this helps!
the original thread + answer