import cv2

def main():
    cap = cv2.VideoCapture(0)
    if not cap.isOpened():
        print("Cannot open camera")
        return

    print("Press 's' to save a still image. Press 'q' to quit.")
    while True:
        ret, frame = cap.read()
        if not ret:
            print("Can't receive frame (stream end?). Exiting ...")
            break

        cv2.imshow('Camera', frame)
        key = cv2.waitKey(1) & 0xFF

        if key == ord('s'):
            cv2.imwrite('still_image.jpg', frame)
            print("Image saved as still_image.jpg")
        elif key == ord('q'):
            break

    cap.release()
    cv2.destroyAllWindows()

if __name__ == "__main__":
    main()