Jetson Nano and OpenCV: Region of Interest Part 1

So in this project I’ve learnt to grab a portion iof the camera display screen and display it separately.So you can pick out a portion of the camera display screen and play around with it! Here I’ve displayed that portion of the frame separately and also converted that part to Gray Scale.

Demo:

Things Required:

  1. Jetson Nano
  2. Keyboard
  3. Mouse
  4. HDMI Screen
  5. Raspberry Pi Camera
  6. External Power Supply

Reference Material:

  1. You can check out this video for the project: (LINK)

Code:

Note that code below is in python

View on/Download from Github: (LINK)

import cv2
dispW=640
dispH=480
flip=2
camSet='nvarguscamerasrc !  video/x-raw(memory:NVMM), width=3264, height=2464, format=NV12, framerate=21/1 ! nvvidconv flip-method='+str(flip)+' ! video/x-raw, width='+str(dispW)+', height='+str(dispH)+', format=BGRx ! videoconvert ! video/x-raw, format=BGR ! appsink'
cam=cv2.VideoCapture(camSet)
while True:
    ret, frame= cam.read()
    #roi referencing from frame
    #roi=frame[50:250,200:400]
    roi=frame[50:250, 200:400].copy()
    roi_gray= cv2.cvtColor(roi,cv2.COLOR_BGR2GRAY)
    cv2.imshow('ROI',roi)
    cv2.imshow('ROIGray', roi_gray)
    cv2.imshow('nanoCam', frame)
    cv2.moveWindow('nanoCam',0,0)
    if cv2.waitKey(1) == ord('q'):
        break
cam.release()
cv2.destroyAllWindows()

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Happy Learning!!

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