Computer Vision with OpenCV

10 Lektionen in dieser Stufe

1. Installing OpenCV and Understanding Image Arrays
   Set up OpenCV in a venv and handle channel order and data types. · Lab: Display a picamera2 frame with OpenCV and fix the swapped red and blue channels.
2. Colour Spaces and HSV Thresholding
   Isolate objects by colour under varying brightness. · Lab: Build trackbars to tune an HSV mask for one coloured object.
3. Blurring, Edges and Morphology
   Clean up images and extract outlines. · Lab: Apply Gaussian blur, Canny edges and open and close operations to a noisy mask.
4. Finding and Measuring Contours
   Detect shapes and compute area, centre and bounding boxes. · Lab: Count objects on a tray and draw each one's area and centroid.
5. Motion Detection by Background Subtraction
   Detect change while ignoring noise and slow lighting drift. · Lab: Trigger on movement larger than a set area and ignore a swaying curtain zone.
6. Tracking a Coloured Object in Real Time
   Follow a target frame to frame and output its position. · Lab: Track a ball and drive the Level 14 pan-tilt head to keep it centred.
7. Calibrating a Camera and Removing Lens Distortion
   Compute intrinsic parameters and undistort images. · Lab: Calibrate with twenty chessboard images and straighten a wide-angle frame.
8. Pose from ArUco Markers
   Detect fiducial markers and estimate distance and orientation. · Lab: Print markers and measure the distance to one within a few millimetres.
9. Reading QR Codes and Barcodes
   Decode symbols from live frames and act on their content. · Lab: Scan a QR code that selects which inspection recipe to run.
10. Profiling a Vision Loop for Frame Rate
    Find the slow stage and speed it up with resolution, regions and threads. · Lab: Time each stage, then double the frame rate using a lores stream and a capture thread.

Abschlussprojekt

A vision inspection station that counts and measures parts on a tray in millimetres, flags rejects and reads a QR job label.

Teile für diese Stufe

• 1 × Raspberry Pi 5 set from Level 1 (Pi 4 also works)
• 1 × Camera module with autofocus
• 1 × Camera mount or tripod
• 1 × Printed calibration chessboard and ArUco marker sheet
• 1 × LED light panel or ring light
• 1 × Assorted coloured objects and small parts tray

In jeder Lektion legst du die passenden Teile direkt in den Warenkorb. Raspberry Pi →