[opencv] use OpenCV to call mobile camera

One 、 Preface

Droidcam It is a tool that can turn a mobile phone into a webcam , We can use Droidcam Give Way OpenCV Have the ability to call mobile camera .

Two 、 step

2.1 install DroidCam

Install on mobile phone and computer respectively DroidCam The client and server of

Download address ：https://pan.baidu.com/s/1DrBn3P1Bx-SXa4d6oziifA?pwd=gr1o
Extraction code ：gr1o

2.2 Test connection status

Mobile phones and computers need to be connected to the same Wifi（ Or the hotspot where computers connect to mobile phones ）.

Turn on the DroidCam Server side , Use your computer browser to visit the following website

If the following page appears , Express DroidCam Installed successfully , Finally, exit the browser .

Only one software can call the mobile camera at a time , If you don't close the browser , Use... In the back OpenCV Calling the mobile camera will report an error .

2.3 Connect the phone camera

At this time, the mobile phone has become a webcam , You can access its video stream through the following link

http://<IP>:<Port>/mjpegfeed?[ The resolution of the ]

• Resolution can be selected
  • 320x240
  • 640x480
  • 960x720
  • 1280x720
  • 1920x1080

Be careful ： Do not exit from the mobile phone during the call of the mobile phone camera DroidCam.

---

example ： Mobile terminal DroidCam The screenshot is as follows , Then the video stream link of the mobile camera is ：

http://192.168.31.211:4747/mjpegfeed

Now you can go through OpenCV Call the phone camera

cap = cv2.VideoCapture("http://192.168.31.211:4747/mjpegfeed")

Complete code

''' Author: CloudSir @Github: https://github.com/CloudSir Date: 2022-05-13 10:24:00 LastEditTime: 2022-07-27 11:47:08 LastEditors: CloudSir Description: '''
import cv2

def get_DroidCam_url(ip, port=4747, res='480p'):
    res_dict = {
    
        '240p': '320x240',
        '480p': '640x480',
        '720p': '1280x720',
        '1080p': '1920x1080',  
    }
    url = f'http://{
      ip}:{
      port}/mjpegfeed?{
      res_dict[res]}'
    return url


# DroidCam  According to the IP Address 、 Port number and camera resolution （ Optional  240p,480p,720p,1080p）
cap = cv2.VideoCapture(get_DroidCam_url('192.168.31.211', 4747, '720p'))

while True:
    ret, frame = cap.read()
    if ret:
        cv2.imshow('image', frame)

    key = cv2.waitKey(1)
    #  Press q Exit procedure 
    if key == ord('q'):
        break

#  Release VideoCapture
cap.release()
#  Destroy all windows 
cv2.destroyAllWindows()

3、 ... and 、 Reference material

• Use OpenCV Read DroidCam Camera data for （ In LAN ）：https://www.jianshu.com/p/523867890957
• DroidCam - Let the mobile phone act as a wireless camera [Android] - Niche software ：https://www.appinn.com/droidcam-for-android/