Note

Hello, welcome to the SunFounder Raspberry Pi & Arduino & ESP32 Enthusiasts Community on Facebook! Dive deeper into Raspberry Pi, Arduino, and ESP32 with fellow enthusiasts.

Why Join?

  • Expert Support: Solve post-sale issues and technical challenges with help from our community and team.

  • Learn & Share: Exchange tips and tutorials to enhance your skills.

  • Exclusive Previews: Get early access to new product announcements and sneak peeks.

  • Special Discounts: Enjoy exclusive discounts on our newest products.

  • Festive Promotions and Giveaways: Take part in giveaways and holiday promotions.

👉 Ready to explore and create with us? Click [here] and join today!

Video 48: Adding Boxes, Rectangles and Circles on Images in OpenCV

In this Raspberry Pi tutorial, learn how to annotate video frames using OpenCV, adding rectangles, circles, and text overlays to enhance your projects.

  1. Introduction: Overview of the SunFounder Raphael kit for Raspberry Pi.

  2. Recap of previous lesson: Using OpenCV to display video frames and overlay text.

  3. Annotating video frames: Adding rectangles, circles, and text annotations between grabbing and displaying frames.

  4. Key considerations: Understanding image coordinates (column, row) and color representation (RGB).

  5. Homework assignment: Practice annotating video frames with different shapes and colors to reinforce learning.

  6. Performance impact: Annotating frames may slightly reduce frame rate, so optimize annotations for efficiency.

Video