cv_keyboard.py

import cv2
import sys
import imagezmq
image_hub = imagezmq.ImageHub()
while True:  # show streamed images until Ctrl-C
    rpi_name, image = image_hub.recv_image()
    cv2.imshow(rpi_name, image) # 1 window for each RPi
    k = cv2.waitKey(1)
    # k = cv2.waitKey(0)
    if k == ord('t'):
        cv2.imwrite('rpi.png',image)
    if k==ord('q'):
        sys.exit(0)
    image_hub.send_reply(b'OK')