python - OpenCV 不附带 "external"库

Question

我试过this example来自 OpenCV 网站:

import numpy as np
import cv2
from matplotlib import pyplot as plt

# changed the image names from box* since the sample images were not given on the site
img1 = cv2.imread('burger.jpg',0)          # queryImage
img2 = cv2.imread('burger.jpg',0) # trainImage

# Initiate SIFT detector
sift = cv2.SIFT()

# find the keypoints and descriptors with SIFT
kp1, des1 = sift.detectAndCompute(img1,None)
kp2, des2 = sift.detectAndCompute(img2,None)

# FLANN parameters
FLANN_INDEX_KDTREE = 0
index_params = dict(algorithm = FLANN_INDEX_KDTREE, trees = 5)
search_params = dict(checks=50)   # or pass empty dictionary

flann = cv2.FlannBasedMatcher(index_params,search_params)

matches = flann.knnMatch(des1,des2,k=2)

# Need to draw only good matches, so create a mask
matchesMask = [[0,0] for i in xrange(len(matches))]

# ratio test as per Lowe's paper
for i,(m,n) in enumerate(matches):
    if m.distance < 0.7*n.distance:
        matchesMask[i]=[1,0]

draw_params = dict(matchColor = (0,255,0),
                   singlePointColor = (255,0,0),
                   matchesMask = matchesMask,
                   flags = 0)

img3 = cv2.drawMatchesKnn(img1,kp1,img2,kp2,matches,None,**draw_params)

plt.imshow(img3,),plt.show()

执行示例，即。 python test.py ，给出以下错误:

Traceback (most recent call last):
  File "test.py", line 10, in <module>
    sift = cv2.SIFT()
AttributeError: 'module' object has no attribute 'SIFT'

我已经从源代码安装了 OpenCV，手动构建。所有模块均由 make 构建，如果我没记错的话。

This question建议我安装 opencv-contrib来自其 GitHub 存储库。我做到了，我仍然得到这个错误。

我的系统是 Ubuntu 15.04 64 位。

Answer 1

我不完全确定这是否适用，但在某些时候他们停止在更高版本的 opencv 中支持 SIFT，我相信这是因为它已获得专利或相关的东西(来源？)，但是替代方法是使用 ORB这将产生类似的效果。

你可以尝试这样的事情:

from cv2 import ORB as SIFT

但是，如果您收到导入错误，这也可能对您有用:

SIFT = cv2.ORB_create

如果您在文件顶部附近插入那些，那么您可能可以在整个文件中保留“SIFT”(或多或少，您明白了，基本上将 cv2.Sift() 替换为 sift = SIFT()你应该 body 更好。)