CODEWITHSUNDEEP
multithreadingopencvcameralatency
user24312540
user24312540

Reputation: 1

Latency on the thermal camera while using multi-threading for multiple cameras

I am trying to do some real-time image processing by openCV with videos from web-camera and thermal-camera. I am using multi-threadings methods: one threading for one camera. The simplified code is given below.

I have confirmed this code works fine for two web cameras (one laptop build-in cam and a Logitech web cam), it also works fine for a thermal camera standing alone (infiray xtherm 2). However, when I tried to take the combination of 1 webcam and 1 thermal camera, I got significant latency on the thermal camera frames. This latency automatically disappeared after I turned off the web-cam preview window.

import cv2
import threading

def simpleVideo(camName, camInd):
    cv2.namedWindow(camName) 
    cam= cv2.VideoCapture(camInd, cv2.CAP_DSHOW)
    while(True):
        ret, frame=cam.read()
        cv2.imshow(camName, frame)
        if cv2.waitKey(1) == 27:  # exit on ESC
            break
    cam.release()
    cv2.destroyWindow(camName)

camT = threading.Thread(target=simpleVideo, args=('cam',0,))
# thermT = threading.Thread(target=simpleVideo, args=('therm',1,))
camT.start()
# thermT.start()

I would like to have synchronised frames between webcam and thermal camera with reasonable frame rate, hence one can detect the hot spot within the viewrange in real time.

I am quite new in openCV and multi-threadings. I appreciate anyone can offer me some help (or other approches). Thanks in advance.

Upvotes: 0

Views: 124

Answers (0)

Related Questions