Python OpenCV ORB 描述符：TypeError：自我类型不正确（必须是“Feature2D”或其派生词）
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OpenCV ORB descriptor: TypeError: Incorrect type of self (must be 'Feature2D' or its derivative)
提问by Wesam
I followed this simple OpenCV Feature Matching exampleexactly:
我完全遵循了这个简单的OpenCV 特征匹配示例：
import cv2
img = cv2.imread('box.png',0) # queryImage
orb = cv2.ORB() # Initiate ORB detector
# find the keypoints and descriptors with ORB
kp1, des1 = orb.detectAndCompute(img, None)
and have been getting the following error:
并且一直收到以下错误：
TypeError: Incorrect type of self (must be 'Feature2D' or its derivative)
I'm using OpenCV 3.3.1
我正在使用 OpenCV 3.3.1
回答by Wesam
This is a OpenCV version compatibility issue. Just use cv2.ORB_create()instead of cv2.ORB().
这是 OpenCV 版本兼容性问题。只需使用cv2.ORB_create()代替cv2.ORB().
The code should look like:
代码应如下所示：
import cv2
img = cv2.imread('box.png',0) # queryImage
orb = cv2.ORB_create() # Initiate SIFT detector
# find the keypoints and descriptors with SIFT
kp1, des1 = orb.detectAndCompute(img, None)
回答by Kaolin Fire
Note the python structures change "frequently" (in internet history years anyway). It's a good idea to pay attention to version.
注意 python 结构“经常”改变（无论如何在互联网历史上）。注意版本是个好主意。
Go here to find the right link: https://docs.opencv.org/
去这里找到正确的链接：https: //docs.opencv.org/
3.1.1 --> 3.1.0 --> https://docs.opencv.org/3.1.0/( OpenCV-Python Tutorials --> https://docs.opencv.org/3.1.0/d6/d00/tutorial_py_root.html) ... not as pretty as that (old) readthedocs site, but more accurate. :)
3.1.1 --> 3.1.0 --> https://docs.opencv.org/3.1.0/( OpenCV-Python 教程 --> https://docs.opencv.org/3.1.0/d6/ d00/tutorial_py_root.html) ... 不像那个（旧的）readthedocs 站点那么漂亮，但更准确。:)
回答by sameer maurya
use cv2.ORB_create() will do it
使用 cv2.ORB_create() 会做到
