python-2.7 - OpenCV 3.0.0-beta 缺少 KNN？

Question

刚刚从 opencv-2.4.11 升级，KNearest 似乎不见了

In [27]: import cv2
In [28]: print(cv2.__version__)
3.0.0-beta

In [29]: cv2.KNearest()

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-29-d2ea29abad59> in <module>()
----> 1 cv2.KNearest()

AttributeError: 'module' object has no attribute 'KNearest'

In [30]: cv2.K
cv2.KAZE_DIFF_CHARBONNIER      cv2.KAZE_DIFF_WEICKERT         cv2.KMEANS_RANDOM_CENTERS      cv2.KeyPoint
cv2.KAZE_DIFF_PM_G1            cv2.KAZE_create                cv2.KMEANS_USE_INITIAL_LABELS  cv2.KeyPoint_convert
cv2.KAZE_DIFF_PM_G2            cv2.KMEANS_PP_CENTERS          cv2.KalmanFilter               cv2.KeyPoint_overlap

Answer 1

实际上，KNearest已经cv2.ml在opencv3中移到模块中，并且您必须调用cv2.ml.KNearest_create()使用knn。

In [1]: import cv2

In [2]: cv2.__version__
Out[2]: '3.0.0'

In [3]: cv2.ml.KNea
cv2.ml.KNearest_BRUTE_FORCE  cv2.ml.KNearest_create   cv2.ml.KNearest_KDTREE

In [3]: cv2.ml.KNearest_create

有关详细信息，请运行help(cv2.ml.KNearest_create()).

享受 ：）

Answer 2

许多模块已从 OpenCV 核心中删除并标记为非自由。这些模块有单独的存储库，必须单独构建。

存储库在这里https://github.com/itseez/opencv_contrib/

该信息在此答案中找到https://stackoverflow.com/a/27419092/892914