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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