Is there a way to increase the webcam resolution of my webcam in OpenCV Python. The default value is 640x480 but, I want it to be 1365x730. Here's my code:
import cv2
cap = cv2.VideoCapture(0)
while(1):
_, frame = cap.read()
cv2.imshow('frame', frame)
key = cv2.waitKey(1)
if key == 27:
break
cap.release()
cv2.destroyAllWindows()
import cv2
cap = cv2.VideoCapture(0)
cam.set(cv2.CAP_PROP_FRAME_WIDTH, 1280)
cam.set(cv2.CAP_PROP_FRAME_HEIGHT, 720)
while(1):
_, frame = cap.read()
cv2.imshow('frame', frame)
key = cv2.waitKey(1)
if key == 27:
break
cap.release()
cv2.destroyAllWindows()
Related
I try to show 2 usb_cameras with 2 differents windows at the same time using openCV -python (I want to implement stereo vision and deep estimation), but I only obtain one window at a time. Can you help me please!
import threading
import cv2
def usb_video1():
cap = cv2.VideoCapture(2)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 200)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 150)
while(True):
ret, frame = cap.read()
if ret == True:
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('s'):
break
else :
break
cap.release()
cv2.destroyAllWindows()
def usb_video2():
cap = cv2.VideoCapture(4)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 200)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 150)
while(True):
ret, frame = cap.read()
if ret == True:
cv2.imshow('frame_2',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else :
break
cap.release()
cv2.destroyAllWindows()
t01 = threading.Thread(target=usb_video1())
t02 = threading.Thread(target=usb_video2())
t01.start()
t02.start()
I am writing a code in python using the OpenCV Python library.
I wanted to access the webcam using the code written, but after executing the code in the terminal, the following error arises again and again.
Code written:
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
cv2.imshow('frame', frame)
if cv2.waitKey(1) == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
Error:
If this is a camera installed on your computer:
import cv2
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
cv2.imshow('frame', frame)
if cv2.waitKey(1) == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
If this is a camera connected via USB:
import cv2
cap = cv2.VideoCapture(1)
while True:
ret, frame = cap.read()
cv2.imshow('frame', frame)
if cv2.waitKey(1) == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
My code:
import cv2
cap = cv2.VideoCapture(0)
cv2.namedWindow('frame', cv2.WINDOW_NORMAL)
while True:
key = cv2.waitKey(0) & 0xFF
ret, frame = cap.read()
cv2.imshow('frame', frame)
if key == ord('q'):
cap.release()
cv2.destroyAllWindows()
break
if key == ord('c'):
cv2.imwrite('capture.jpg', frame)
cap.release()
cv2.destroyAllWindows()
I run this code.
It shows the gray display.
I point the camera at an object and press the 'c' key.
It shows not the object image but the image of what the camera pointed at when I run the code, and saves it.
I point the camera at somewhere else and press 'c' key agein.
It shows the image of the object which it saw at 3. and save it.
The camera lags 1 step. Why?
This could be to do with a lack of cv::waitKey(0) and the window is not getting updated, although this is odd.
Try adding a cv::waitKey command after imshow like this
import cv2
cap = cv2.VideoCapture(0)
cv2.namedWindow('frame', cv2.WINDOW_NORMAL)
while True:
key = cv2.waitKey(0) & 0xFF
ret, frame = cap.read()
cv2.imshow('frame', frame)
cv2.waitKey(0)
if key == ord('q'):
cap.release()
cv2.destroyAllWindows()
break
if key == ord('c'):
cv2.imwrite('capture.jpg', frame)
cap.release()
cv2.destroyAllWindows()
I think it might be this as when you do the imwrite you are effectively breaking out of the while loop (albeit slightly) to do something else with opencv.
I have videostreams and I'd like to convert them to foreground detected videos on which everything is white that moving and all others are black.
When I run this below script nothing happens, python ide just waits. Should I wait, does the video render or do i make something wrong?
Thanks
import cv2
import numpy
cap = cv2.VideoCapture('2018_02_28_12_07_42.h264')
fgbg = cv2.createBackgroundSubtractorMOG2()
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))
#while(cap.isOpened()):
while True:
ret, frame = cap.read()
#if ret == True:
fgmask = fgbg.apply(frame)
out.write(frame)
cv2.imshow('original', frame)
cv2.imshow('fg', fgmask)
k = cv2.waitKey(30) & 0xff
if k == 27:
break
cap.release()
out.release()
cv2.destroyWindows()
Since a couple of days I can't open my iSight camera from inside an opencv application any more. cap = cv2.VideoCapture(0) returns, and cap.isOpened() returns true. However, cap.grab() just returns false. Any ideas?
Example Code:
import cv2
cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)
rval = True
while rval:
rval, frame = vc.read()
cv2.imshow("preview", frame)
key = cv2.waitKey(20)
if key == 27: # exit on ESC
break
Mac OS 10.8.5
Python 2.7.5 (but also not working from inside a C++ app)
OpenCV 2.4.6.1
This is how I got the camera working for your code (on OSX 10.6):
import cv2
cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)
rval, frame = vc.read()
while True:
if frame is not None:
cv2.imshow("preview", frame)
rval, frame = vc.read()
if cv2.waitKey(1) & 0xFF == ord('q'):
break
I had a segmentation fault after I grab an image. It turned out that I used cv2.destroyAllWindows() before cap.release(). Below I show working code.
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
#do some ops
cap.release()
cv2.imshow("output", output)
cv2.waitKey(0)
cv2.destroyAllWindows()
This code works on El Captain.