这有什么问题 - 为什么它不会在我创建的窗口中绘制圆圈?
threeDWinName = "3D View"
cv2.namedWindow(threeDWinName, cv2.CV_WINDOW_AUTOSIZE)
img2 = cv2.imread('white.png', 0)
cv2.imshow(threeDWinName,img2)
cv2.circle(img2, (100,100),100,255,-1)
cv2.imshow(threeDWinName,img2)