from pathlib import Path
import cv2
以下の関数を呼び出してくると画像が開けない
#from classfy02 import input_data

def main():
    parent_path = Path(__file__).parent
    path = str(
        (parent_path / 'cross.png').resolve()
    )


    img = cv2.imread(path)
    cv2.namedWindow('screen', cv2.WINDOW_NORMAL)
    cv2.setWindowProperty('screen', cv2.WND_PROP_FULLSCREEN,
    cv2.WINDOW_FULLSCREEN)
    cv2.imshow('screen', img)
    cv2.waitKey(1000)

if __name__ == '__main__':
    main()