OpenCV和Python：knnMatch参数的问题 [英] OpenCV and Python: Problems with knnMatch arguments

问题描述

我正在尝试按照opencv教程此处。不幸的是，它在flann.knnMatch（des1，des2，k = 2）失败了。这是我的代码：

I am trying to follow the opencv tutorial here. Unfortunately, it fails at flann.knnMatch(des1,des2,k=2). Here is my code:

import cv2
import time
import numpy as np

im1 = cv2.imread('61_a.tif')
im2 = cv2.imread('61_b.tif')

surf = cv2.SURF(500,3,4,1,0) 
print "Detect and Compute"
kp1 = surf.detect(im1,None)
kp2 = surf.detect(im2,None)

des1 = surf.compute(im1,kp1)
des2 = surf.compute(im2,kp2)

MIN_MATCH_COUNT = 5
FLANN_INDEX_KDTREE = 0
index_params = dict(algorithm = FLANN_INDEX_KDTREE, trees = 5)
search_params = dict(checks = 50)

flann = cv2.FlannBasedMatcher(index_params,search_params)
matches = flann.knnMatch(des1,des2,k=2)

我收到错误：

matches = matcher.knnMatch(des1,des2,k=2)
TypeError: Argument given by name ('k') and position (2)

我试图更改匹配以镜像修复此问题，如下所示：

I have tried to change the matching to mirror the fix in this question like so:

flann = cv2.flann_Index(des2, index_params)
matches = flann.knnMatch(des1,2,params={})

然后我收到此错误：

flann = cv2.flann_Index(des2, index_params)
TypeError: features is not a numerical tuple

我真的不确定我做错了什么。有人能指出我正确的方向吗？

I'm really not sure what I'm doing wrong. Can someone point me in the right direction?

如果您碰巧知道SURF或ORB的全景/拼接的PYTHON工作示例相当简单，我也会很感激。我已经搜索了很多内容，并且只找到了关于如何完成它的操作（或者用C语言编写）或者只找到了未完成/破坏的例子。

If you happen to know of a working PYTHON example of SURF or ORB for panorama/stitching that's fairly straightforward, I would appreciate that too. I have googled around quite a bit and have only found pieces of operations about how it might be accomplished (or it's written in C) or have only found unfinished/broken examples.

谢谢！

推荐答案

surf.compute（）返回两个关键点和描述符列表。 flann.knnMatch（）感到困惑，因为 des1 是一对列表，而不是 k = 1 它找到另一对列表（即 des2 ）。检查des1和des2的形状（）。

surf.compute() returns both keypoints and descriptors lists. flann.knnMatch() gets confused because des1 is a pair of lists and instead of k=1 it finds another pair of lists (namely des2). Check the shape() of des1 and des2.

传递 des1 [1] 和 des2 [1] 到 flann.knnMatch（）或使用 surf.detectAndCompute（）代替 surf.detect（）和 surf.compute（）。

Either pass des1[1] and des2[1] to flann.knnMatch() or use surf.detectAndCompute() in replacement of surf.detect() and surf.compute().

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