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import cv2
def show_preview(flag, img, title=None):
if title is None:
title = flag
cv2.imshow(flag, img[:, :, ::-1].copy())
cv2.setWindowTitle(flag, title)
cv2.setWindowProperty(flag, cv2.WND_PROP_TOPMOST, 1)
cv2.waitKey(1)
def close_all_preview():
cv2.destroyAllWindows()
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