Following the prior blog post about the installation of OpenCV to Raspberry Pi, then I tested the installation using USB camera and Pi camera with python code. After that, I will show you the block set I build for putting a camera and raspberry in this post. This block set will put in the top of the fridge.
Test USB Camera
For this preliminary step, I will use webcam camera HD Logicool C270 with resolution 1280x720 pixel. Then I use the sample code for live view camera as below,
import numpy as np import cv2 cap = cv2.VideoCapture(0) if cap.isOpened() == False: print('Connecting camera') else: print('Start Live View') cv2.namedWindow('USB Camera'); cap.set(cv2.CAP_PROP_FRAME_WIDTH,640) cap.set(cv2.CAP_PROP_FRAME_HEIGHT,480) while( cap.isOpened() ): ret,frame = cap.read() if ret==False: print('Grabbing camera fail') break cv2.imshow('Live',frame) key = cv2.waitKey(5) if key==255: key=-1 if key >= 0: break print('Closing the camera') cap.release() cv2.destroyAllWindows() quit()
and this is the screenshot of the desktop
Fig.1 Screenshot of Live View using C270 Webcam camera
Test Pi Camera
After installing Pi camera provided in the Challenge Kit I copy the code from https://www.pyimagesearch.com/2015/03/30/accessing-the-raspberry-pi-camera-with-opencv-and-python/ as below,
from picamera.array import PiRGBArray from picamera import PiCamera import cv2 import time camera = PiCamera() camera.resolution = (640, 480) camera.framerate = 32 rawCapture = PiRGBArray(camera, size=(640, 480)) time.sleep(0.1) for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True): img = frame.array cv2.imshow("Live View", img) key = cv2.waitKey(1) & 0xFF rawCapture.truncate(0) if key == ord("q"): break
and the screenshot of the camera live view is shown below,
Fig.2 Screenshot of Live View using Pi Camera
Building Block set
The next step is building a block set for installed both webcam camera and raspberry. This block set will put in the top of the fridge for registering and recording the stock.
We have described our progress in this project. We have installed the openCV to Raspberry and test it using both USB camera and Pi Camera. We also build a block set for installing both camera and raspberry (Main server). The next step in our project plan is installed the Whatsapp messenger to raspberry for communication base. After that our plan is developing the blobing algorithm before recognition step. Hope that our project runs well.