JETANK AI Kit-Motion Detection

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This tutorial will detect if there is a running or changing motion on the screen through the camera.

• Connect to the cart by typing http://<jetbot_ip_address>:8888in the browser address bar and open /Notebooks/JETANK_3_motionDetect/ on the left side. Open the file JETANK_3_motionDetect_en.ipynb. The program is available in English and Chinese, where the CN suffix is a Chinese comment and EN is an English comment.
  
• The program first initializes the camera and creates a widget to display the camera screen.
  

The program will display the image after normal operation, if you run the last tutorial program after not running the camera off code at this time may display the camera initialization error. Reboot the system to solve.

• This program is a motion detection function, here we need to pay attention to the value of 30, this value indicates the threshold value of the change area, this value also indicates the sensitivity of motion detection, the smaller the value the higher the sensitivity, but also the greater the noise.
• The program uses OpenCV and imutils. jetson nano has automatic OpenCV by default, if it prompts to import imutils, it is possible that imutils was not installed when the JETANK library was installed because of the network. you need to open the terminal in JupyterLab and run the install.sh script to install it.

• Run the above program to start motion detection, when there is an object moving or changing on the screen, there will be a green rectangle box circling the area where the change occurs.

• The program finally closes the image processing function and turns off the camera.