我已經編寫了一個代碼來裁剪和圖像並在屏幕上顯示。不幸的是,我在裁剪之後得到一個空白的窗口。有什麼建議麼?裁剪圖像後的空白窗口
import cv
image_raw = cv.imread('ball.png') #read the image
cv.ShowImage('image_raw',image_raw) #show the image
rec = (180,300,250,180) #rectangle defining roi
image = cv.SetImageROI(tagged_image,rec) #for selecting roi from an image
cv.ShowImage('image',image)