Raspberry Pi Camera Module 3 image editor by OpenCV

cam_opencv_resize_and_draw.py

from picamera2 import Picamera2
import cv2

picam2 = Picamera2()

# Set up Auto Focus
config = picam2.create_preview_configuration()
picam2.configure(config)
picam2.start()

# Enable Continuous Auto Focus
picam2.set_controls({"AfMode": 2, "AfTrigger": 0})

try:
    while True:
        # Capture frame from the camera
        frame = picam2.capture_array()
        # Convert color from RGB to BGR for OpenCV
        frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)
        # Resize image to 50%
        frame_resized = cv2.resize(frame, None, fx=0.5, fy=0.5)
        # Draw rectangle
        cv2.rectangle(frame_resized, (50, 50), (150, 100), (0, 0, 255), 2)
        # Add text to image
        cv2.putText(frame_resized, "Hello, OpenCV !", (10, 30), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 1)
        # Display the frame
        cv2.imshow("OpenCV Draw", frame_resized)
        
        # Press 'q' to exit
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
            
finally:
    # Close all OpenCV windows
    cv2.destroyAllWindows()
    # Stop the camera
    picam2.stop()