opencv - Clone an image in cv2 python -


i'm new opencv, here question, python function act same cv::clone() in cpp? try rect 

    rectimg = img[10:20, 10:20]

but when draw line on ,i find line appear both on img , rectimage,so , how can done?

if use cv2, correct method use .copy() method in numpy. create copy of array need. otherwise produce view of object.

eg:

in [1]: import numpy np  in [2]: x = np.arange(10*10).reshape((10,10))  in [4]: y = x[3:7,3:7].copy()  in [6]: y[2,2] = 1000  in [8]: 1000 in x out[8]: false     # see, 1000 in y doesn't change values in x, parent array.

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