Automation, sensing and robotics • Object detection. White object on white background

Code:

import cv2import numpy as npfrom picamera2 import Picamera2import timedef detect_objects_and_draw(frame, threshold_area):    edges = cv2.Canny(frame, 100, 200)    contours, _ = cv2.findContours(edges, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)    object_found = False    for contour in contours:        area = cv2.contourArea(contour)        if area > threshold_area:            object_found = True            x, y, w, h = cv2.boundingRect(contour)            cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)    return object_founddef main():    threshold_area = 75  # <-- Adjust this value to tune sensitivity    picam2 = Picamera2()    config = picam2.create_preview_configuration(main={"size": (640, 480)})    picam2.configure(config)    picam2.set_controls({"AfMode": 2})    picam2.start()    time.sleep(0.5)    print(f"Detecting objects with threshold_area = {threshold_area}. Press 'q' to quit.")    while True:        frame = picam2.capture_array()        detected = detect_objects_and_draw(frame, threshold_area)        if detected:            print("Object detected!")        else:            print("No object")        cv2.imshow("Camera Feed with Detection", frame)        if cv2.waitKey(1) & 0xFF == ord('q'):            break    cv2.destroyAllWindows()    picam2.close()if __name__ == "__main__":    main()