Hi !
Let's start with some posts using reTerminal with a very simple scenario:
Connect a Camera to the device and show the camera feed in reTerminal display
The output is something similar to this one.
And let´s start with the base code to run this, based on my previous posts on OpenCV (see references)
| import os | |
| import cv2 | |
| import time | |
| # init camera | |
| execution_path = os.getcwd() | |
| camera = cv2.VideoCapture(0) | |
| while True: | |
| # Init and FPS process | |
| start_time = time.time() | |
| # Grab a single frame of video | |
| ret, frame = camera.read() | |
| # calculate FPS >> FPS = 1 / time to process loop | |
| fpsInfo = "FPS: " + str(1.0 / (time.time() - start_time)) | |
| print(fpsInfo) | |
| cv2.putText(frame, fpsInfo, (10, 10), cv2.FONT_HERSHEY_SIMPLEX, 0.4, (255, 255, 255), 1) | |
| # Display the resulting image | |
| cv2.imshow('Video', frame) | |
| # Hit 'q' on the keyboard to quit! | |
| if cv2.waitKey(1) & 0xFF == ord('q'): | |
| break | |
| # Release handle to the webcam | |
| camera.release() | |
| cv2.destroyAllWindows() |
The main prerequisite to run this code is to have OpenCV installed. And this is a tricky process in a Raspberry Pi. I used to install all the necessary libraries and apps, and then build OpenCV in my device (see references).
Today I follow these steps to make this happens.
1st I install Virtual Environments to I can work in isolated modes for my tests. Run these scripts
sudo pip3 install virtualenv
virtualenv -p python3 camLabs
source camLabs/bin/activate</pre>
Last line will activate my virtual environment.
Once I'm in the virtual environment, I can install OpenCV with the following command
sudo pip install opencv-contrib-python==4.1.0.25</pre>
And run the quick test to validate the installation.
In the process I learned a couple of lessons about installation with amazing errors like these ones
At the end, the simple command to install OpenCV makes the magic!
References
- SeeedStudio - Getting Started with reTerminal
- Visual Studio Code – 20 lines to display a webcam camera feed with Python using OpenCV
- RaspberryPi – Install OpenCV
Continue reading #reTerminal – Installing OpenCV, and using a USB WebCam 🤳
Top comments (3)
For that length, I'd prefer having the whole post here instead of a link to your blog :(
Thanks for the feedback ! I'm using the automated cross-post process. I'll try to ffigure out how to do the full cross-posting, instead of the header.
I managed to have the full content sync from my blog to here :D