I want to display my camera output in 2 different windows. I want to do some drawing in one of them and display the original image in the other. So what I did is I create a thread that fetches the camera stream and assigned it to a global variable. Then, 2 separate thread retrieved these frames and assigned it to a local variable. However, upon displaying, both are showing the drawings.
import cv2
import time
from threading import Thread
camip = 0
camera_frame = None
def read():
cam = cv2.VideoCapture(camip)
while True:
ret,frame = cam.read()
global camera_frame
camera_frame = frame
def display(x):
print "Starting camera "+str(x)
while True:
temp_frame = camera_frame
cv2.rectangle(temp_frame,(130,130),(430,430),(0,255,0),2)
cv2.imshow("Camera "+str(x),temp_frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
def display2(x):
print "Starting camera "+str(x)
while True:
temp_frame = camera_frame
cv2.imshow("Camera "+str(x),temp_frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
t0 = Thread(target=read)
t0.start()
time.sleep(1)
t1 = Thread(target=display, args=(1,))
t1.start()
time.sleep(1)
t2 = Thread(target=display2, args=(2,))
t2.start()