本文介绍了在OpenCV + Python中使用knnMatch时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想使用Python + OpenCV匹配两张图片.我已经使用SURF从它们两个中提取关键点和描述符.现在，我需要匹配这些描述符，因此，我决定使用Flann Matcher.
I want to match two pictures using Python+OpenCV. I have used SURF to extract keypoints and descriptors from both of them. Now, I need to match these descriptors and for this reason I decided to use Flann Matcher.
flann_params = dict(algorithm = FLANN_INDEX_KDTREE,trees = 4)
matcher = cv2.FlannBasedMatcher(flann_params, {})
但是当我尝试将knnMatch与描述符(desc1，desc2)一起使用时，openCV会引发异常.
But when I try to use knnMatch with descriptors (desc1, desc2), openCV throws an exception.
raw_matches=matcher.knnMatch(np.asarray(desc1),np.asarray(desc2), 2)
例外情况如下:
raw_matches=matcher.knnMatch(np.asarray(desc1),np.asarray(desc2), 2) #2
cv2.error: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/work/OpenCV-2.4.2/modules/flann/src/miniflann.cpp:299: error: (-210) type=6
in function buildIndex_
如何正确使用knnMatch?是虫子吗?
How I could use knnMatch correctly? Is it a Bug?
推荐答案
我使用函数np.asarray()使用正确的数据类型解决了此问题
I solved this problem using the correct data type with the function np.asarray()
raw_matches=matcher.knnMatch(np.asarray(desc1,np.float32),np.asarray(desc2,np.float32), 2) #2
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